Cubic Communications CDR-3250, CDR-3280 Technical Manual

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TECHNICAL MANUAL

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OPERATION AND MAINTENANCE INSTRUCTIONS

OPERATIONAL LEVEL

RECEIVER,

DIGITAL SIGNAL PROCESSING,

SINGLE,

VLF - HF

CDR-3250

CDR-3280

Cubic Communications, Inc.

9535 Waples Street

San Diego, California 92121-2953

Telephone: (858) 643-5800 Telefax: (858) 643-5803

Manual Part No. 2600-1021-1

TECHNICAL MANUAL

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OPERATION AND MAINTENANCE INSTRUCTIONS

OPERATIONAL LEVEL

RECEIVER,

DIGITAL SIGNAL PROCESSING,

SINGLE,

VLF - HF

CDR-3250

CDR-3280

Cubic Communications, Inc.

9535 Waples Street

San Diego, California 92121-2953

Telephone: (858) 643-5800 Telefax: (858) 643-5803

Manual Part No. 2600-1021-1

Issue 2.2 24 December 1998

Change 2 2 March 2001

CDR-3250/80 TECHNICAL MANUAL

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RECORD OF CHANGES

CHANGE DATE TITLE OF BRIEF DESCRIPTIONS ENTERED BY

12 Aug 99

2 March 01

Engineering update. Page changes are as follows: Title Page, Record of Changes, ii & 3-1.

DCR 730428: Update Generated Spurious data in Specification table. Pages changed are as follows: Title Page, Record of Changes & 1-5.

CCI Eng. Dept.

Issue 2.1

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FOREWORD

SCOPE

This manual contains information to obtain best performance from the CDR-3250 and CDR-3280 receivers. The information includes: a general description of the equipment, preparation for use and installation instructions, operating instructions, general theory of operation, maintenance instructions, preparation for reshipment, storage, and parts list.

PROPRIETARY DATA

Information contained in this document is the property of Cubic Communications, Inc. This inform ation may not be disclosed to a third party, either wholly or in part, without the written consent of Cubic Communications, Inc.

CORRECTION NOTICE

Information contained in this document is believed to be correct as of the publication date. If a variation is noted between the information in this manual and the equipment in your possession, contact the factory for clarification. Future issues will be updated if necessary.

RIGHTS RESERVED

Cubic Communications, Inc. reserves the right to change the specifications, design details, and method of fabrication of the equipment at any time without notice.

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TABLE OF CONTENTS

Chapter Page Chapter Page

1 GENERAL DESCRIPTION..... 1-1

1-1 INTRODUCTION. .................... 1-1

1-2 EQUIPMENT DESCRIPTION........... 1-1

1-3 SPECIFICATIONS.................... 1-1

1-4 EQUIPMENT FURNISHED ............ 1-1

1-5 STORAGE DATA .................... 1-1

1-6 TOOLS AND TEST EQUIPMENT ....... 1-1

1-7 SAFETY PRECAUTIONS.............. 1-1

2 PREPARATION FOR USE AND

INSTALLATION INSTRUCTIONS 2-1

2-1 INTRODUCTION .................... 2-1

2-2 UNPACKING AND INSPECTION ....... 2-1

2-3 INSTALLATION ..................... 2-1

2-4 CONNECTIONS ..................... 2-1

3 OPERATING INSTRUCTIONS . 3-1

Section I. LOCAL CONTROL........ 3-1

3-1 INTRODUCTION. .................... 3-1

3-2 LOCAL OPERATION ................. 3-1

3-2.1 Controls and Display .......... 3-1

3-2.2 Parameter Entry ............. 3-1

3-2.2.1 Vacuum Fluorescent Displays. .. 3-1

3-2.2.1.1 Normal Display .............. 3-1

3-2.2.1.2 Data Entry Display ........... 3-1

3-2.2.1.3 Meter Display ............... 3-1

3-2.2.1.4 ISB Monitor Mode ............ 3-1

3-2.2.2 Controls .................... 3-1

3-3 POWER ON AND INITIAL SET UP ...... 3-5

3-4 EMERGENCY OPERATION ............ 3-5

3-5 INITIAL ADJUSTMENTS AND CONTROL

SETTINGS ...........................

3-6 NORMAL OPERATION ................ 3-5

3-5

3-7 SETTING OR CHANGING RECEIVER

PARAMETERS .......................

3-7.1 Basic Soft Key Menus ......... 3-9

3-7.2 Primary Soft Key Menu .......3-10

3-7.2.1 Frequency. ................. 3-10

3-7.2.2 Mode .....................3-10

3-7.2.3 Bandwidth .................3-12

3-7.2.3.1 Assigning Bandwidths to Soft Key

Labels ....................

3-7.2.3.2 Assigning Default Bandwidths To

Receive Modes ..............

3-7.2.4 Squelch ................... 3-14

3-7.2.5 Gain ...................... 3-15

3-7.2.5.1 Assigning AGC Decay Time

Values to Soft Key Labels .....

3-7.2.5.2 Assigning Default AGC Values

To Receive Modes ...........

3-7.3 Secondary Soft Key Menu .....3-18

3-7.3.1 BFO ......................3-18

3-7.3.2 IF Shift .................... 3-19

3-7.3.3 Skip ...................... 3-19

3-7.3.4 Store ...................... 3-19

3-7.3.5 Recall ..................... 3-20

3-7.4 Scan/Sweep Soft Key Menu ....3-21

3-7.4.1 Scan ......................3-21

3-7.4.2 Sweep .....................3-24

3-7.4.3 Step ...................... 3-28

3-7.4.4 Dwell ..................... 3-29

3-7.4.5 Bridge .................... 3-31

3-7.5 Utility Soft Key Menu .........3-31

3-7.5.1 Test ...................... 3-31

3-7.5.2 Configuration............... 3-32

3-7.5.2.1 Clearing Non-Volatile Memory . 3-32 3-7.5.2.2 Configuring Receiver Remote

Control Operation ...........

3-7.5.2.2.1 Serial Bus .................. 3-35

3-7.5.2.2.2 IEEE-488 Bus ..............3-39

3-7.5.2.3 Configuring Receiver Default

Settings ...................

3-7.5.3 Faults..................... 3-41

3-7.5.4 System ....................3-42

3-5

3-13 3-14

3-17 3-18

3-35

3-39

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TABLE OF CONTENTS - Cont.

Chapter Page Chapter Page

Section II. REMOTE CONTROL...... 3-46

3-8 REMOTE OPERATION USING

SERIAL BUS. ......................

3-8.1 Serial Bus Description ....... 3-46

3-8.2 Serial Bus Message Format ... 3-46

3-8.3 Serial Bus Message Types .... 3-46

3-8.3.1 Serial Bus Command Messages 3-46

3-8.3.1.1 Serial Bus Radio Command

Messages ................. 3-46

3-8.3.1.2 Serial Bus Interface Command

Messages .................

3-8.3.2 Serial Bus Status Messages ... 3-46

3-8.3.2.1 Serial Bus Radio Status

Messages .................

3-8.3.2.2 Serial Bus Interface Status

Messages .................

3-8.4 Serial Bus Message Protocol .. 3-48

3-8.4.1 Serial Bus Normal Mode ..... 3-48

3-8.4.2 Serial Bus Acknowledge Mode 3-48

3-8.4.3 Serial Bus Independent Mode . 3-48

3-8.5 Line Driver Operation ....... 3-48

3-8.6 Broadcast Address .......... 3-48

3-8.7 Serial Bus Message Definition . 3-48 3-9 REMOTE OPERATION USING

IEEE-488 BUS. ......................

3-9.1 IEEE-488 Bus Description .... 3-68

3-9.2 Device Capabilities ......... 3-68

3-9.3 Talking and Listening ....... 3-68

3-9.4 SRQ and Serial Poll Response . 3-70

3-9.5 Device Clear And Selected

Device Clear Response ......

3-10 POWER UP AND TESTING

CONSIDERATIONS .................

3-11 EEPROM CLEARING................ 3-71

3-46

3-48

3-68

3-70

4 GENERAL THEORY OF

OPERATION................... 4-1

4-1 INTRODUCTION ..................... 4-1

4-2 BLOCK DIAGRAM DISCUSSION. ....... 4-1

4-2.1 AC Receptacle /RFI Filter ...... 4-1

4-2.2 AC Line Filter ............... 4-1

4-2.3 Power Supply Module ......... 4-1

4-2.4 RF Analog Module ............ 4-1

4-2.4.1 Preselector .................. 4-1

4-2.4.2 First Mixer .................. 4-1

4-2.4.3 First IF Gain Control ......... 4-1

4-2.4.4 First LO Driver .............. 4-1

4-2.4.5 Second Mixer ................ 4-2

4-2.4.6 Second LO .................. 4-2

4-2.4.7 Third Mixer ................. 4-2

4-2.4.8 Third LO ................... 4-2

4-2.5 Synthesizer Module ........... 4-2

4-2.5.1 Control ..................... 4-2

4-2.5.2 Reference Frequency .......... 4-2

4-2.5.3 1st LO Generation ............ 4-2

4-2.5.4 2nd/3rd LO REF Generation .... 4-3

4-2.5.5 Audio ...................... 4-3

4-2.6 Digital Module. .............. 4-3

4-2.6.1 Control Section .............. 4-3

4-2.6.2 DSP Section ................. 4-4

4-2.7 Serial Bus (Optional) .......... 4-5

4-2.7.1 Serial Bus Remote Interface Board 4-5

4-2.7.2 Serial Bus Cable Assembly ..... 4-5

4-2.8 IEEE-488 Bus (Optional) ....... 4-5

4-2.8.1 IEEE-488 Remote Interface Board 4-5

4-2.8.2 IEEE-488 Cable Assembly ...... 4-5

4-2.9 Front Panel ................. 4-5

4-2.10 Main Adjustment Knob ........ 4-6

4-2.11 Keypad Board ............... 4-6

4-2.12 Display Module .............. 4-6

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TABLE OF CONTENTS - Cont.

Chapter Page Chapter Page

5 MAINTENANCE INSTRUCTIONS 5-1

Section I. PREVENTIVE

MAINTENANCE .......... 5-1

5-1 INTRODUCTION .................... 5-1

5-2 CLEANING AND LUBRICATION ...... 5-1

5-3 INSPECTION........................ 5-1

5-3.1 External Inspection ............. 5-1

5-3.2 Internal Inspection ............. 5-1

5-4 PERFORMANCE VERIFICATION ...... 5-1

5-4.1 Receiver Sensitivity ............. 5-2

5-4.2 Line Audio ................... 5-2

5-4.3 Reference Frequency ........... 5-2

5-4.3.1 Receiver Check ................ 5-3

5-4.3.2 TCXO Check .................. 5-3

Section II. CORRECTIVE

MAINTENANCE ........ 5-4

5-5 TROUBLESHOOTING ................ 5-4

5-5.1 Troubleshooting Philosophy ... 5-4

5-5.2 Built-In Tests. ............... 5-4

5-5.2.1 POST ..................... 5-4

5-5.2.2 BITE ...................... 5-4

5-5.2.3 BIT ....................... 5-5

5-5.3 Troubleshooting Procedure .... 5-5

5-5.3.1 Fault Identification .......... 5-5

5-5.3.2 Initial Checks ............... 5-5

5-5.3.3 Front Panel Display

Interpretation ...............

5-5.3.4 Signal Tracing .............. 5-5

5-5

5-6 SUBASSEMBLY REMOVAL AND

REPLACEMENT .....................

5-6.1 Synthesizer Module. ........... 5-8

5-6.2 RF Analog Module ............ 5-8

5-6.3 Power Supply Module ......... 5-8

5-6.4 AC Line Filter Board .......... 5-8

5-6.5 Digital Module ............... 5-8

5-6.6 Remote Control Board (optional) 5-9

5-6.7 Keypad Board ............... 5-9

5-6.8 Keypad. .................... 5-9

5-6.9 Display Module .............. 5-9

5-6.10 Power/Volume Knob .......... 5-9

5-6.11 Main Adjustment Knob ........ 5-9

5-6.12 Optical Shaft Encoder ........ 5-10

5-6.13 Fan Assembly............... 5-10

5-6.14 Support Handles ............ 5-10

5-7 SOFTWARE UPLOADING ............. 5-10

5-8

6 PREPARATION FOR

RESHIPMENT ................. 6-1

6-1 INTRODUCTION. .................... 6-1

6-2 DISASSEMBLY AND REMOVAL ...... 6-1

6-3 PACKAGING ........................ 6-1

6-4 SHIPPING .......................... 6-1

7 STORAGE..................... 7-1

7-1 INTRODUCTION .................... 7-1

7-2 STORAGE ENVIRONMENT ........... 7-1

7-3 PRESERVATION .................... 7-1

8 PARTS LIST ................... 8-1

iv Issue 2.2

8-1 INTRODUCTION. .................... 8-1

8-2 REPLACEABLE PARTS LISTING....... 8-1

ANNEX

A REMOTE CONTROL ONLY OPTION . . AN-1A

B DC POWER SUPPLY OPTION ....... AN-1B

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LIST OF ILLUSTRATIONS

Figure Page

1-1A CDR-3250 Front View ................................................... 1-0

1-1B CDR-3280 Front View ................................................... 1-0

2-1A CDR-3250 Rear View .................................................... 2-2

2-1B CDR-3280 Rear View .................................................... 2-2

2-2 Power Connector (J1) Pin Descriptions ...................................... 2-3

2-3 Digital Data Connector Signals............................................. 2-7

3-1 Front Panel Controls and Display........................................... 3-2

3-2 Parameter Entry Controls and Display........................................ 3-3

3-3 Normal Display. ........................................................ 3-4

3-4 Data Entry Display....................................................... 3-4

3-5 Meter Display........................................................... 3-4

3-6 Meter/ISB Display. ...................................................... 3-4

3-7 Soft Key Menus Overall Flow Diagram...................................... 3-6

3-8 Dwell Time/Bridge Time Relationship...................................... 3-30

3-9 Serial Bus Message Format............................................... 3-47

3-10 Serial Bus Character Format ............................................. 3-47

3-11 IEEE-488 Serial Poll Response Byte ....................................... 3-71

4-1 Digital Module DSP Firmware Functions ................................... 4-7

5-1 Signal Tracing Flow Chart ............................................... 5-7

FO-1A CDR-3250 Outline and Mounting Drawing .................................. FP-1

FO-1B CDR-3280 Outline and Mounting Drawing .................................. FP-3

FO-2 CDR-3250/80 Block Diagram ............................................. FP-5

FO-3 CDR-3250/80 Interconnect Diagram ....................................... FP-7

FO3.1 CDR-3250/80 DC Interconnect Diagram ............................. See Annex B

FO-4 CDR-3250/80 Motherboard Schematic ..................................... FP-9

FO-5A CDR-3250 Replaceable Parts Locator Diagram .............................. FP-13

FO-5B CDR-3280 Replaceable Parts Locator Diagram .............................. FP-17

Annex Illustrations

AN-1 DIP Circuit - Switch Settings ........................................... AN-1A

FO 3.1 CDR-3250/80 DC Interconnect Diagram .................................. AN-2B

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LIST OF TABLES

Table Page

1-1 CDR-3250/80 Specifications .............................................. 1-2

1-2 Items Furnished......................................................... 1-7

1-3 Recommended Tools and Test Equipment (Or Equivalent) ....................... 1-7

2-1 Rear Panel Connections .................................................. 2-3

2-2 Serial Remote Control Bus Connector (J4) Pin Descriptions...................... 2-4

2-3 IEEE-488 Remote Control Bus Connector (J4) Pin Descriptions .................. 2-6

2-4 DIGITAL DATA Connector (J7) Pin Description .............................. 2-7

2-5 AUDIO Connector (J8) Pin Descriptions ..................................... 2-8

3-1 Front Panel Controls And Display .......................................... 3-2

3-2 Parameter Entry Controls ................................................. 3-3

3-3 Serial Bus Interface Command Messages .................................... 3-50

3-4 Serial Bus Interface Status Messages ....................................... 3-50

3-5 Radio Command and Status Messages ...................................... 3-51

3-6 IEEE-488 Bus Management Signals ........................................ 3-69

3-7 IEEE-488 Bus Handshake Lines ........................................... 3-69

3-8 IEEE-488 Implemented Interface Capabilities ................................ 3-69

5-1 Fault Detectors ......................................................... 5-5

5-2 Front Panel Fault Messages ............................................... 5-6

8-1 Replaceable Parts. ....................................................... 8-1

AN-1 Remote Control Option - Differences..................................... AN-1A

vi Issue 2.2

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Figure 1-1A CDR-3250 Front View.

(blank)/1-0 Issue 2.2

Figure 1-1B CDR-3280 Front View.

CHAPTER 1

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GENERAL DESCRIPTION

CDR-3250/80 TECHNICAL MANUAL

1-1 INTRODUCTION.

This chapter contains an equipment description, equipment supplied and required, storage data, tools and test equipment, and a summary of safety precautions.

1-2 EQUIPMENT DESCRIPTION.

The CDR-3250 and CDR-3280 (figure 1-1) are multi-mode digital signal processing (DSP) receivers with a frequency range from 10 kHz to 30 MHz.

The receivers are operationally similar, but packaged in two different configurations. The receivers contain individually shielded modules mounted in a 19 by 3½-inch rack-mount chassis (CDR-3250), or 8½ by 3½-inch desktop chassis (CDR-3280). Two CDR-3280 receivers may be fastened together (using an optional dual rack-mount kit) to construct a standard 19-inch rack-mount configuration.

The receivers are controlled by a 19-button keypad and main adjustment knob used to select the receiver parameters. Five "soft keys" work in conjunction with the vacuum fluorescent digital display immediately above the soft keys.

In addition to soft key selections, the vacuum fluorescent digital display provides a variety of data including channel, mode, BFO setting, frequency, bandwidth, gain, local/remote control, an RF level meter, an AF level meter, and a FREQ meter. Additional information is displayed depending on soft key selections.

appears at the ALT audio output. This output may be used for multiplexed direction-finding (DF) signal processors.

A PHONES jack on the front panel provides for connection of an external speaker, or headphones. The audio level is controlled by the front panel power/volume control. The correct audio is automatically selected depending on the receive mode. However, when the ISB receive mode is selected, the operator must select either the normal (USB) or alternate (LSB) audio for application to the jack.

Either an internal or external reference frequency may be used. The external reference frequency is automatically sensed and used when connected to the rear panel.

The receivers may be remotely controlled (optional) by a companion RCU-3100 remote control unit (optional with serial bus only) or by any suitable bus controller using either an RS-232, or RS-422 serial interface bus, or an IEEE488 parallel interface bus.

1-3 SPECIFICATIONS.

Refer to table 1-1 for specifications of the equipment.

1-4 EQUIPMENT FURNISHED.

Table 1-2 lists the items furnished, and optional items.

1-5 STORAGE DATA.

Refer to Chapter 7 for storage data.

By proper selection of parameters, the receivers can detect a wide variety of signals. These include: amplitude modulation (AM), on/off keyed (CW), upper sideband (USB), lower sideband (LSB), independent sideband (ISB) (suppressed carrier and independent), and frequency modulation (FM). Frequency shift keyed (FSK) signals can be demodulated as single sideband suppressed carrier signals or as true FM signals.

The selected detector audio output is available on the NORM 600-ohm balanced line, rear panel speaker connection, or front panel PHONES jack. In all modes except ISB, the FM detector output is available as a DCcoupled video signal on a single-ended line. In ISB mode the USB signal appears on the NORM audio output, while the LSB signal appears on the ALT audio 600-ohm line. In all other demodulation modes, the AM detector output

Issue 2.2 1-1

1-6 TOOLS AND TEST EQUIPMENT.

Table 1-3 lists recommended tools and test equipment for operational level maintenance. There are no special tools or test equipment required.

1-7 SAFETY PRECAUTIONS.

Safety precautions are presented in this manual preceded by the word WARNING or CAUTION just prior to the point where the hazard is likely to be encountered. Warnings and cautions are defined as follows:

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WARNING

Refers to a procedure or practice that, if not

correctly followed, could result in injury, death,

or long term health hazard.

Table 1-1 CDR-3250/80 Specifications.

Item Specification

FREQUENCY

Tuning Range 10 kHz - 30 MHz Resolution 1 Hz Tuning Steps Adjustable 1 Hz through 10 MHz Internal Reference

Frequency Stability

External Reference Frequency 10 MHz (Automatically switches to external reference when external reference

Synthesizer Lock Time 3 ms typical, 6 msec maximum

1 ppm over temperature (standard TCXO).

0.1 ppm over temperature (optional high-performance OCXO).

signal is applied)

Refers to a procedure or practice that, if not correctly followed, could result in equipment damage or destruction.

CAUTION

DETECTION MODES LSB, USB, ISB, CW, AM, FM, FSK DISPLAY Full graphics vacuum fluorescent display SCAN & SWEEP

Channels 250 programmable channels stored in nonvolatile memory Scan Up to 250 channels Sweep f1 to f2 at selected steps. Up to 125 frequency bands programmable Rate 1 - 100 channels/second Adjustable Threshold -112 to 0 dBm in 1/2 dB increments

RF SECTION

Antenna Impedance 50 ohms Antenna VSWR Less than 3:1 Sensitivity for 10 dB

SINAD (above 1.6 MHz).

Protection 50 dB reflective attenuation. Activates at signal levels between +10 dBm and +20

AM (6 kHz BW 50% modulation): min. -105 dBm. FM (16 kHz BW 5 kHz dev. 400 Hz modulation, 20 dB sinad): -98 dBm. CW (500 Hz BW): min. -122 dBm. SSB (3 kHz BW): min. -113 dBm.

dBm. Protects from input signals of levels up to 10 Watts.

Preselection Eight suboctave bandpass preselector filters used from 1.6 to 30 MHz.

Frequencies below 1.6 MHz are selected by two lowpass filters. Filter selection is automatic with tuned frequency selection.

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Table 1-1 CDR-3250/80 Specifications-Cont.

Item Specification

GAIN CONTROL Automatic (AGC) or Manual (MGC)

AGC

Dynamic Range Output held within 1 dB over a 110 dB range AGC Threshold -112 dBm (Output level -3 dB with respect to a -60 dBm signal) AGC Attack Time

(SSB & CW)

Fast < 2 ms for 50 dB change (sweep/scan only)

Normal < 10 ms for 50 dB change (product detector modes) AGC Decay Time 20 ms to 4 seconds nominal for 50 dB change AGC for AM or FM mode Carrier derived average detection with 50 ms response time for 50 dB change

MGC

Control Range 0 to 127.5 dB (nominal) gain reduction in 0.5 dB steps.

IF SECTION

1st IF 40.456 MHz. Standard Filter BW = 22.5 kHz 2nd IF 456 kHz. Standard Filter BW = 30 kHz 3rd IF

(cont)

Automatically selected

24 kHz, Lowpass filter @ 80 kHz

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Table 1-1 CDR-3250/80 Specifications-Cont.

Item Specification

4th IF (DSP) 51 selectable bandwidths (100 Hz to 16 kHz).

Bandwidths are effective bandpass filter bandwidths at the 3 dB down points. Shape factor is 3 dB to 60 dB (Better than 2:1, 400 Hz and above). Inband ripple is 1 dB max.

Standard selectable bandwidths are as follows:

No. BW (Hz) No. BW (Hz)

0 100 26 2100 1 150 27 2200 2 200 28 2300 3 250 29 2400 4 300 30 2500 5 350 31 2600 6 400 32 2700 7 450 33 28001 8 500 34 2900

9 550 35 3000 10 600 36 3100 11 650 37 3200 12 700 38 3300 13 800 39 3400 14 900 40 3500 15 1000 41 4000 16 1100 42 5000 17 1200 43 6000 18 1300 44 70002 19 1400 45 80002 20 1500 46 90002 21 1600 47 100002 22 1700 48 120002 23 1800 49 140002 24 1900 50 160002 25 2000

ISB mode restricted to 2800 Hz BW only.

Bandwidths from 7 kHz to 16 kHz are available in AM or FM only.

INTERFERENCE IMMUNITY

IF Rejection 100 dB minimum Image Rejection 100 dB minimum Cross Modulation Unmodulated wanted signal of -60 dBm together with a modulated (30% AM at 1

kHz) unwanted signal of -10 dBm spaced 100 kHz apart will produce less than 10% cross modulation of wanted signal.

Blocking Attenuation of a wanted RF signal of -60 dBm and caused by an unmodulated

signal of +10 dBm spaced 100 kHz away is less than 3 dB. Oscillator Reradiation -110 dBm, up to 1 GHz from receiver antenna connector into 50 ohms. Spurious Responses -120 dBm equivalent or less for -50 dBm input signals

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Table 1-1 CDR-3250/80 Specifications-Cont.

Item Specification

Generated Spurious Above 0.14 MHz, two at no more than -110 dBm. All others less than -120 dBm Intermodulation Distortion:

2nd-order Input intercept point of +40 dBm (+55 dBm above 1.6 MHz with 2600-1107-2 RF

Analog module )

3rd-order Input intercept point of +30 dBm

OUTPUTS

WBIF Wideband IF, 456 kHz, 20 kHz min. BW NBIF (analog) Narrowband IF reconstructed from I & Q equal to selected bandwidth,

455 kHz, -10 dBm ± 3 dB over dynamic range Third IF (digital) I & Q outputs from DSP Video Demodulated FM, 500mV peak to peak into 75 ohms (deviation equal to 30% of

selected bandwidth) FSK Provides RS232 compatible output C.O.R. NORM and ALT Carrier Operated Relay signals Audio Line Output

(Normal)

Audio Line Output

(Alternate)

PHONES 0 to 2V p-p, 8 ohm load impedance to front panel phone jack. Short circuit

Reference 10 MHz , 0 dBm, 50 ohms nominal.

INPUTS

Synthesizer Reference 10 MHz external standard, 0 dBm, 50 ohms Antenna 50 ohms nominal

GENERAL DATA

Power Requirements 90 - 260 VAC 47 - 440 Hz, 60 watts, switching mode power supply Dimensions CDR-3250 - 19" (48.2 cm) wide, 3.5" (8.9 cm) high, 22.03 (55.95 cm) deep

600 ohms balanced pair on audio connector short circuit protected, less than 3%

distortion at rated output, (FM mode only with de-emphasis on).

AM, CW, LSB, USB, ISB: 0 dBm ±3 dB (Normal audio is the USB when ISB mode

is selected).

FM: 0.5 V/kHz AC coupled (4V p-p max.)

600 ohms balanced pair on audio connector short circuit protected, less than 3%

distortion at rated output, (FM mode only with de-emphasis on). 0 dBm ±3 dB.

(Alternate audio is the LSB when ISB mode is selected)

protected. Speaker output in parallel to rear panel audio connector.

CDR-3280 - 8.45" (2.17 cm) wide, 3.5" (8.9 cm) high, 22.25" (57.05 cm) deep Weight CDR-3250 - Approx 21.8 lbs. (9.9 kg) (Unpackaged)

CDR-3280 - Approx 16.0 lbs. (7.25 kg) (Unpackaged)

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Table 1-1 CDR-3250/80 Specifications-Cont.

Item Specification

ENVIRONMENTAL DATA

Temperature Range 0 to +50°C Operating, -40 to +85°C Storage.

OPTIONS

RCU-3100 Remote Controller (Serial bus option must be installed). Controls up to 10 receivers, expandable to

100 receivers. Line audio handling up to 10 receivers. High-performance reference

oscillator Serial Data Bus RS-232 or RS-422 Parallel Data Bus IEEE-488 Rack-Mount Slides Slides for CDR-3250 for installation into 19-inch rack. Dual Rack Mount Kit Hardware and slides to fasten two CDR-3280 receivers together for installation in

DC Power 20-32 VDC. 3A maximum

OCXO, 0.1 ppm of tuned frequency

standard 19-inch rack

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Table 1-2 Items Furnished.

Part No. Nomenclature Furn./Optl.

260001-XX

CDR-3250 or CDR-3280 VLF - HF Digital Receiver Furn. 696-012 AC power cord Furn. 2600-1021-1 Technical manual Furn. 2600-1009-1 Rack Mount Kit, Dual (for CDR-3280 only) Optl. Not furnished 222-088 Mounting slides for rack mount (for CDR-3250 only) Optl. Not furnished 222-026 Mounting brackets for slides Optl. Not furnished 324-009/324-010 Audio Connector/Hood (cable end) Optl. Not furnished 324-070/324-010 Digital Data Connector/Hood (cable end) Optl. Not furnished

XX indicates model number and factory installed options. Refer to identification plate on equipment.

Table 1-3 Recommended Tools and Test Equipment (Or Equivalent).

Part No. Nomenclature Manufacturer

- Screwdriver, Phillips 6 inch, No. 1 Any

- Screwdriver, Phillips 6 inch, No. 2 Any

- Driver, nut, 1/4 inch Any

- Wrench, open end, 3/16 inch Any

- Wrench, Allen, .050 inch Any

- Wrench, Allen, 1/16 inch Any

- Wrench, Allen, 7/64 inch Any HP8642B RF signal generator Hewlett Packard 465B Oscilloscope Tektronix 8050A Digital multimeter (true RMS) Fluke HP5381A Frequency counter HP8568B Spectrum analyzer

Optional

Hewlett Packard Hewlett Packard

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CHAPTER 2

PREPARATION FOR USE AND INSTALLATION INSTRUCTIONS

2-1 INTRODUCTION.

This chapter contains unpacking, inspection, installation, connections, and initial alignment procedures.

2-2 UNPACKING AND INSPECTION.

To unpack and inspect the receiver for damage, perform the following procedures:

WARNING

Do not drop the equipment when lifting or carrying. Personnel injury or equipment damage may occur.

1. Inspect the shipping carton for damage before unpacking the receiver.

NOTE

If the carton is damaged, open the carton in the presence of a shipping carrier agent if possible. If damage is found after the receiver is unpacked, retain the carton and packing materials for inspection.

2. Open the carton and remove the foam packing material on top of the receiver.

3. Lift the receiver from the carton.

2-3 INSTALLATION.

The receiver is designed for 19-inch rack mount (CDR-

3250) or desktop (CDR-3280) operation in a relatively dust free environment with an ambient temperature range between 0 and +50 the CDR-3250. Follow the instructions provided with the slides for installation. An optional dual rack mount kit is available for the CDR-3280 to mount two units into a standard 19-inch rack. No special tools or additional materials are required for installation.

See figure FO-1A (CDR-3250) and FO1B (CDR-3280) for clearance requirements and mounting details.

C. Optional slides may be provided for

NOTE

2-4 CONNECTIONS.

Refer to table 2-1 and connect the antenna, power cable, and optional equipment to the unit. (See figure 2-1A (CDR-

3250) and 2-1B (CDR-3280)).

NOTE

Refer to the RCU-3100 Technical Manual if the RCU-3100 remote controller is used.

NOTE

Save carton for possible reshipment.

4. Inspect the receiver for external damage including dents and scratches.

CAUTION

Do not attempt to operate the receiver if major damage is found.

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Figure 2-1A CDR-3250 Rear View.

2-2 Issue 2.2

Figure 2-1B CDR-3280 Rear View.

Table 2-1 Rear Panel Connections.

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CDR-3250/80 TECHNICAL MANUAL

Name Connector

On Unit

POWER (J1) IEC 320-C-13

REF IN (J2) BNC Jack

REF OUT (J3) BNC Jack

SERIAL REMOTE CONTROL (J4) (Opt)

IEEE-488 REMOTE CONTROL (J4) (Opt)

ANTENNA (J5) BNC Jack

NBIF (J6) BNC Jack

(343-002)

(344-246)

25-pin female D subminiature connector.

IEEE-488 24-pin "blue ribbon" connector assy.

(344-246)

Recommended

Mating Type

NEMA 5-15P (696-012, Power Cord)

BNC Plug (Customer Option)

25-pin male D subminiature connector. (Customer Option)

Standard IEEE-488 24-pin connector. (Customer Option)

BNC Plug (Customer Option)

Description

90 to 260 VAC, 47 to 440 Hz, single phase 60 watts max. Figure 2-2 shows the pin descriptions.

Reference frequency in. Used to connect 10 MHz external frequency standard. 50 ohms, 0 dBm.

Reference frequency out. Used to connect to other receivers or equipment using the same reference frequency standard. If external reference is used, this signal is the same as applied to the REF IN connector. 50 ohms, 0 dBm.

(Optional daughter board in Digital module, and cable assembly must be installed). For external RS-232C or RS422 remote control bus operation. Table 2-2 lists the pin descriptions. Refer to para 3-7.5.2.2.1 to set the serial bus configuration.

(Optional daughter board in Digital module, and cable assembly must be installed). For external remote control bus operation. Table 2-3 lists the pin descriptions. Refer to para 3-7.5.2.2.2 to set the IEEE-488 bus address.

Coaxial antenna connection. Impedance is approximately 50 ohms with a VSWR less than 3 to 1 at the receiver tuned frequency.

Narrowband IF output signal. Centered at 455 kHz with a bandwidth equal to the selected bandwidth. This output may be connected to a spectrum analyzer or other equipment. The signal level is -10 dBm.

DIGITAL DATA (J7) 15-pin "D"

subminiature male (324-009)

AUDIO (J8) 15-pin "D"

subminiature female (324-070)

WBIF (J9) BNC Jack

(344-246)

15-pin "D" subminiature female (324-070)

15-pin "D" subminiature male (324-009)

BNC Plug (Customer Option)

Used to connect I & Q outputs to external digital signal processing equipment. Table 2-4 lists the pin descriptions. Figure 2-3 shows the timing relationship.

Used to connect audio to optional RCU-3100 remote controller or other equipment. Table 2-5 lists the pin descriptions.

Wideband IF (WBIF) output signal. Centered at 456 kHz (with a bandwidth of 30 kHz). This output may be connected to a spectrum analyzer or other equipment. For input signal levels between 0 and -60 dBm, the WBIF signal level is -30 dBm. For input signal levels below -60 dBm, the gain at the WBIF output is approximately 30 dB.

NOTE: Part numbers in parenthesis (000-000) indicate CCI part number if applicable.

GROUND

(GREEN)

HOT

(BLACK)

NEUTRAL

(WHITE)

Figure 2-2 Power Connector (J1) Pin Descriptions.

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Table 2-2 Serial Remote Control Bus Connector (J4) Pin Descriptions.

Pin Signal Remarks Bus

2 TXD Transmitted Data RS-232 3 RXD Received Data RS-232 4 RTS Request to Send RS-232 5 CTS Clear to Send RS-232

7 GND Signal Ground RS-232 12 RSA Request to Send A RS-422 13 RSB Request to Send B RS-422 14 SDA Send Data A RS-422 15 SDB Send Data B RS-422 16 RDA Receive Data A RS-422 17 RDB Receive Data B RS-422 23 CSA Clear to Send A RS-422 24 CSB Clear to send B RS-422

NOTE: The pinout for the RS-232 interface follows the recommendations of the EIA standard. Since the EIA standard for RS-422 does not call out recommended pin assignments, these circuits are assigned to unused pins on the same connector as the RS-232 circuits.

Only one set of signals (RS-232 or RS-422) is active at any given time. Selection is made at the front panel of the receiver. The name "Transmitted Data" for RS-232 is synonymous with "Send Data" for RS-422. All circuits for the RS-422 interface consist of a differential pair of signal lines labeled A and B. Both lines must be connected to the circuit at the other end, A to A and B to B.

A receiver configured with the serial interface will operate as Data Terminal Equipment (DTE). This means that the circuits named Transmitted Data and Request to Send are outputs from the receiver and the circuits named Received Data and Clear to Send are inputs to the receiver. The electrical characteristics of the interface will conform to either EIA standard RS-232-C or EIA standard RS-422-A with the following exceptions.

When so configured from the front panel of the receiver, the line drivers associated with the Transmitted Data and Request to Send circuits for the unit will be in a high impedance state except when that unit has been commanded by the system controller to transmit. When done transmitting, the line drivers will return to the high impedance state. This feature, referred to as bus sharing or party line operation, allows multiple receivers to share a single circuit for the Transmitted Data signal to the system controller. In systems where only one receiver is connected to the external controlling device, this feature may be disabled from the receiver front panel.

(CONT)

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Table 2-2 Serial Remote Control Bus Connector (J4) Pin Descriptions-Cont.

NOTE (CONT):

The Request to Send (RTS) and Clear to Send (CTS) handshake circuits are generally not used when the line drivers are configured for bus sharing operation. When the line drivers are not configured for bus sharing, the operation of the CTS and RTS lines is as follows: When a receiver is ready to accept remote control commands it will set the RTS circuit true. When it has received a message and is processing the commands, it will set the RTS circuit false until it is ready to receive another command. The receiver will only transmit messages to an external device when its CTS circuit is held true by the external device. The external device may stop the transmitted output of the receiver (to prevent buffer overflow for example) by taking the CTS circuit false. When the CTS circuit is again taken true, the receiver will begin transmitting where it left off. NOTE: When bus sharing is enabled from the receiver front panel, the state of the CTS circuit is ignored.

The number of CDR-3200 series receivers that may be connected to a single controller is dependent on the serial bus type and the line driver characteristics of the controller, but in general is at least 10 receivers for RS-232 operation and at least 30 receivers for RS-422 operation. Dual chassis models count as two receivers. The input resistance of the RS-232 line receivers is approximately 5000 Ohms. The CDR-3250/80 receiver contains no termination resistors for the RS-422 bus.

If connected directly to a computer interface also configured as DTE, a reversal of transmit and receive data (TXD and RXD or SD and RD) and request to send and clear to send (RTS and CTS or RS and CS) lines may be necessary. The Request to Send and Clear to Send lines may be jumpered together on the mating connector if required by the system. These reversals or jumpers are normally not required if units are connected through a modem. If a CDR-3200 series receiver is to be connected to another DTE device as its controller, the circuits must be swapped for proper operation as follows:

CDR-3200 Series Receiver Transmitted Data ---------->----------- Received Data Received Data ----------<----------- Transmitted Data Request to Send ---------->----------- Clear to Send Clear to Send ----------<----------- Request to Send Signal Ground ----------------------- Signal Ground

CAUTION: Refer to note below EEPCLR command in table 3-5.

Other DTE Device

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Table 2-3 IEEE-488 Remote Control Bus Connector (J4) Pin Descriptions.

Pin Signal Remarks

1 D1 Data Bit 1

2 D2 Data Bit 2

3 D3 Data Bit 3

4 D4 Data Bit 4

5 EOI End Or Identify (Bus management)

6 DAV Data Valid (Handshake)

7 NRFD Not Ready For Data (Handshake)

8 NDAC Not Data Accepted (Handshake)

9 IFC Interface Clear (Bus management) 10 SRQ Service Request (Bus management) 11 ATN Attention (Bus management) 12 SHIELD 13 D5 Data Bit 5 14 D6 Data Bit 6 15 D7 Data Bit 7 16 D8 Data Bit 8 17 REN Remote Enable (Bus management) 18 GND 6 Twisted with pin 6 19 GND 7 Twisted with pin 7 20 GND 8 Twisted with pin 8 21 GND 9 Twisted with pin 9 22 GND 10 Twisted with pin 10 23 GND 11 Twisted with pin 11 24 LOGIC GND Signal common

NOTE: Cable requirements for the IEEE-488 bus are determined by the actual system design. Refer to the hardware installation instructions provided with the Bus Controller. The bus cables may be configured in either a star or daisy-chain. Any combination of the two configurations may be used provided the total cable length does not exceed 20 meters (65.5 feet) or 2 meters (6.5 feet) for each bus device connected, whichever is less. The IEEE-488 bus connector on the rear panel is the type specified in the IEEE-488-1978 standard and uses metric studs. Make sure the locking devices are engaged on all connectors in the system.

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Table 2-4 DIGITAL DATA Connector (J7) Pin Description.

Pin Signal Remarks

1 SERCLK (-) Serial clock inverted (0 to +5V)

2 SERCLK (+) Serial clock (0 to +5V)

3 GND Ground

4 FRSYNC (-) Frame sync inverted (0 to +5V)

5 FRSYNC (+) Frame sync (0 to +5V)

6 GND Ground

7 SERDAT (-) Serial data inverted (0 to +5V)

8 SERDAT (+) Serial data (0 to +5V)

9 GND Ground

10 - 14 NC Not connected

15 GND Ground

NOTE: (+) indicates standard TTL signal levels. (-) indicates standard TTL signal (logical complement). For differential operation, use both pins. TTL: V

= +2.5V, min; VOL = +0.5V, max.

Figure 2-3 Digital Data Connector Signals (typical)

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Table 2-5 AUDIO Connector (J8) Pin Descriptions.

Pin Signal Remarks

1 NORM BAL AUDIO 600 ohms balanced pair

2 NORM BAL RTN

3 GND

4 ALT BAL AUDIO 600 ohms balanced pair

5 ALT BAL RTN

6 VIDEO RTN (GND)

7 SPKR AUDIO 4 ohms or greater

8 SPKR RTN (GND)

9 NORM C.O.R. Normal channel Carrier Operated Relay

10 ALT C.O.R. Alternate channel Carrier Operated Relay

Low = squelch open, High = squelch closed. +20 volts @ 250 mA max load.

11 VIDEO (All modes except FSK or ISB)

Output level is ±1V for FM deviation of ±25% of selected bandwidth

FSK Mode (RS-232-C)

± 8v Shift Values:

VNAR: 50 Hz NAR: 85 Hz MED: 170 Hz WIDE: 850 Hz

12-15 NC

C.O.R. signals are switch closure to ground. External equipment must provide pull-up voltage.

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CHAPTER 3

OPERATING INSTRUCTIONS

Section I. LOCAL CONTROL

3-1 INTRODUCTION.

This chapter contains both local (manual) and remote control (using a remote control bus) operating instructions for the receiver including a description of the controls and displays and operating procedures.

3-2 LOCAL OPERATION.

Local (manual) operation is performed using the front panel controls and displays.

3-2.1 Controls and Display.

3-1 lists the front panel controls, and display, and their functions.

3-2.2 Parameter Entry.

entry controls and display used to change the receiver parameters. Each is described below.

3-2.2.1 Vacuum Fluorescent Displays. fluorescent display shows two basic displays; normal, and data entry. The displays are described below.

3-2.2.1.1 Normal Display. 3-3) shows the basic receiver parameters including channel number, skip, receive mode, squelch or BFO setting, operating frequency, bandwidth selection, AGC/MGC selection, local or remote control selection, the soft key menus, and NEXT to indicate that there are other soft key labels available in the menu. Five soft keys (unlabeled) are located below the menu. The labels for the soft keys appear in the menu display immediately above each key. When a soft key is pressed, the function above the key is selected. Pressing the NEXT key (when NEXT is displayed in the display) selects a different set of soft key labels.

3-2.2.1.2 Data Entry Display. (figure 3-4) is present during most soft key entries. Basic receiver parameters are shown on the right side of the display. The center of the display is used for operator instructions and parameter entry display. (BFO frequency entry is shown).

3-2.2.1.3 Meter Display. display, the meter display (figures 3-5 and 3-6) shows the basic receiver parameters and can usually be displayed from the normal or data entry display when the MTR/MNU key is pressed. The soft key menu is replaced with two or three meters depending on the receive mode. In the ISB receive mode the FRQ meter is replaced with a SELECT soft key to allow selection of the ISB monitor mode. Each of the meters has an analog arrow that shows the

(See figure 3-1.) Table

Figure 3-2 shows the parameter

The vacuum

The normal display (figure

The data entry display

Although not considered a basic

approximate reading on the meter while the center of the meter shows a numeric reading. Each meter is described below.

When the meters are displayed, the first four soft keys select the PRIMARY, SECONDARY, SCAN/SWEEP, or UTILITY soft key menus respectively. However, if the meters are displayed in a submenu (i.e. freq. change), these soft keys are not active.

RF meter - Indicates RF signal strength from -115 to

+10 dBm (signals less than -115 dB displayed as "<115").

AF meter - Indicates audio level at the 600 ohm output

on the rear panel from -50 to +12 dBm.

FRQ meter - (Not shown when ISB mode is selected).

Indicates the frequency of a carrier type signal with respect to the center of the IF bandwidth. When exactly on center frequency, the display should read 000. When the bandwidth is at or below 2 kHz, the meter displays in Hz. When bandwidth is above 2 kHz, meter displays in kHz.

Either the normal display or the meter display may be displayed as the default. Pressing the MTR/MNU key will alternately select either display. Refer to paragraph 3-7.5.4 to change the default setting.

3-2.2.1.4 ISB Monitor Mode. selected, there are separate squelch and AGC decay setting for the normal (USB) and alternate (LSB) channels. The ISB Monitor mode determines which channel is affected by changing these parameters in the normal way, and which channel is displayed by the RF and AF meters. The current ISB Monitor mode is indicated in the normal display by a small “U” or “L” following the “ISB” in the mode display, see figure 3-6.

From the front panel the ISB Monitor mode is changed by selecting the meter display and pressing the SELECT soft key. From the remote control interface the ISB Monitor mode (also referred to as the ISB Access Mode) is changed with the V* command.

3-2.2.2 Controls. parameter entry controls, the display and their functions.

NOTE

When ISB mode is

(See figure 3-2). Table 3-2 lists the

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Figure 3-1 Front Panel Controls and Display.

Table 3-1 Front Panel Controls And Display.

Control Function

Vacuum Fluorescent Display Provides display of receiver parameters and other data to the operator. Main Adjustment Knob Provides analog adjustment of parameters using optical digital encoder on shaft of

knob. Power/Volume Knob Combination power on/off switch and volume control for PHONES jack Keypad Provides data entry of receiver parameters. PHONES Headphone jack

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Figure 3-2 Parameter Entry Controls and Display.

Table 3-2 Parameter Entry Controls.

Control Function

LOC/REM Key Pressing the LOC/REM key selects either local (manual) or remote control of the receiver.

When the desired control mode is selected CTRL:LOCAL or CTRL:REMOTE is displayed in the lower center of the vacuum fluorescent display.

Soft Keys Five soft keys (unlabeled) are provided below the soft key menu. Each key corresponds to

the menu selection immediately above the key. When a soft key is pressed, the function above the key is selected for parameter entry. Pressing the NEXT key allows a different set

of soft keys to appear in the soft key menu. MTR/MNU Key The MTR/MNU key selects either the soft key menu display or the meter display. Numeric Keys The numeric keys are used to select numbers or decimal point for entry. NEXT Key The NEXT key allows selection of the next soft key menu. Main Adjustment Knob The main adjustment knob has a digital encoder on the knob's shaft that allows

incrementing and decrementing numeric entries without using the numeric keys. Using the

knob can save time in most cases by eliminating key presses.

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Figure 3-3 Normal Display.

Figure 3-4 Data Entry Display.

Figure 3-5 Meter Display.

Figure 3-6 Meter/ISB Display.

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3-3 POWER ON AND INITIAL SET UP.

To turn on and initially set up the receiver do the following:

1. Set the power/volume knob on.

2. Observe the display for initialization displays then the normal display.

3. Plug headphones or speaker into the PHONES jack.

4. Adjust the volume as desired.

5. To shut down the receiver, set the power/volume knob to OFF.

NOTE

If the receiver is remotely controlled, the receiver must be initially configured for bus operation. The receiver's bus parameters must mat ch the pa rameters of t he remote controller. Perform the remote control configuration procedures in paragraph 3-

7.5.2.2.

3-4 EMERGENCY OPERATION.

There are no emergency operating procedures.

3-5 INITIAL ADJUSTMENTS AND CONTROL SETTINGS.

3-6 NORMAL OPERATION.

Receiver functions are set or changed by watching the front panel display, while using the keypad (and/or main adjustment knob) to select and enter the parameters. If the meter display is shown (figure 3-5 or 3-6), press the MTR/MNU key to show the normal display containing the soft key menu (figure 3-3). Refer to paragraph 3-7 to set or change receiver parameters.

3-7 SETTING OR CHANGING RECEIVER PARAMETERS.

When the receiver is first powered on, a power-on self test (POST) tests key circuits in the receiver, and performs a built-in test equipment (BITE) test. If a failure is detected, the display shows the failure code. When no failures are detected, the receiver displays the primary soft key menu. Each of the four main soft key menus are described in paragraph 3-7.1. The secondary and subsequent main soft key menus are selected by pressing the NEXT key. Pressing the MTR/MNU key while in most menus causes the receiver to switch to the METER display.

The following paragraphs lists the soft key menus used to change receiver parameters. Shaded keys indicate the next logical key to press in a particular sequence. If no shading is shown the operator has a choice of keys to press. Figure 3-7 shows a flow chart of all soft key menus.

There are no initial adjustments or control settings necessary.

NOTE

To cancel the current operation and return to the main menu, press the CANCEL soft key when displayed. To return to the function group menu press the RETURN soft key when displayed. This key allows the operator to continue entering other related functions without returning to the main menu. To return to the main menu press the DONE soft key when displayed.

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Figure 3-7 Soft Key Menus Overall Flow Diagram (Sheet 1 of 3).

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SCAN/SWEEP SOFT KEY MENU

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CDR-3250/80 TECHNICAL MANUAL

SCAN SWEEP

FROM TO OFFSET

RATE DONE SCAN NEXT

STEP DWELL BRIDGE

FROM TO OFFSET

RATE SWEEP DONE NEXT

SCAN

BKSP ENTER RETURN

ENTER CANCEL

CANCELBKSP ENTERRATE RATE

SWEEP DONE

STOP CONT SKIP RETURN

BKSP ENTER +/-

BKSP ENTER

BKSP ENTER RETURN

DONE

STOP CONT SKIP RETURN

BKSP ENTER +/-

BKSP ENTER

RETURN

Figure 3-7 Soft Key Menus Overall Flow Diagram (Sheet 2 of 3).

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UTILITY SOFT KEY MENU

TEST CONFIG FAULTS SYSTEM

MEMORY

ADDRS DONE

NEXT SHARE IDENT DONE

CHNL SKIP MDFLTS SFLBLS CANCEL

ALL

CONT CANCEL

ON OFF CANCEL

DAC CANCELDSPLYBITE

CANCELABOUT INTENS SOUND MENUS

MENUS METERS CANCEL

CLICK BEEP DONE

ON OFF RETURN

62.5% 75% 87.5% 100% DONE

5% 12.5% 25% 50% DONE NEXT

ADDRS DONE

CURNT CUMUL

TYPE RATE BITS

ENAB DISAB RETURN

A B C ENTER CANCEL

D E F ENTER CANCEL

CANCEL

CANCELINIT REMOTE ROLOFFPWRDWN

ENTER

NO YES CANCEL

ENTER RETURN

125000 38400 19200 9600

NEXT 4800 2400 1200 600

NEXT 300 150 110 75

RS-232 RS-422

ENTER RETURN BKSP

CANCELMGC MD

HARD SOFT DONE

NEXT CANCELMDFLTS NBIF

CANCELINVERT ENTER

CANCEL

RETURN

CONT CANCEL

SERIAL BUS ONLY

3280MEN3.FLO

Figure 3-7 Soft Key Overall Flow Diagram (Sheet 3 of 3)

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3-7.1 Basic Soft Key Menus. Four basic soft key menus can be displayed; primary, secondary, scan/sweep, and utility. Each menu is described below.

A. Primary Soft Key Menu.

This menu is displayed after power up and completion of POST testing.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

MTR

MNU

B. Secondary Soft Key Menu. This menu is displayed by pressing the NEXT key while the primary soft key menu

is shown.

Secondary Soft Key Menu.

BFO IF SHF SKIP STORE RECALL

MTR

MNU

C. Scan/Sweep Soft Key Menu. This menu is displayed by pressing the NEXT key while the secondary soft key

menu is shown.

Scan/Sweep Soft Key Menu.

SCAN SWEEP STEP DWELL BRIDGE

MTR

MNU

D. Utility Soft Key Menu. This menu is displayed by pressing the NEXT key while the scan/sweep soft key menu

is shown.

Utility Soft Key Menu.

TEST CONFIG FAULTS SYSTEM

Pressing NEXT while in this menu restores the primary soft key menu.

Each basic soft key menu is detailed in the following paragraphs.

MTR

MNU

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3-7.2 Primary Soft Key Menu. The following paragraphs detail the primary soft key menu parameter entries.

3-7.2.1 Frequency.

This function sets or changes the receiver frequency.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

MTR

MNU

Press the FREQ key to adjust the receive frequency. The following menu appears.

FREQ Entry Soft Key Menu.

7RATE RATE6 BKSP ENTER CANCEL

MTR

MNU

Change the receive frequency with the keys or main adjustment knob. Repeatedly pressing the RATE keys moves a bar under the digits in the display. The bar under the digit indicates the tuning resolution of the main adjustment knob.

NOTE

The BKSP (backspace) key clears the previously entered digit and allows entry of correct digit.

Press the NEXT key and the following menu appears.

FREQ Entry - NEXT Soft Key Menu.

STEP ENTER CANCEL

MTR

MNU

Press STEP to cause the main adjustment knob to change in the same frequency increments as programmed for the sweep function. (Refer to paragraph 3-7.4.3 to set the step increment.) While rotating the main adjustment knob the display will change by the step frequency amount.

3-7.2.2 Mode.

This function selects the receiver reception mode.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

Press the MODE key to change the receive mode. The following menu appears.

MTR

MNU

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MODE Soft Key Menu.

LSB USB CW AM CANCEL

MTR

MNU

Press the desired receive mode, or press the NEXT key and the following menu appears.

MODE - NEXT Soft Key Menu.

ISB FM FSK CANCEL

MTR

MNU

Press the desired receive mode, or press the NEXT key to show the previous menu.

NOTE

When ISB reception mode is selected, a small U or L will be shown after the ISB in the display. This indicates which sideband's audio (upper or lower) is being monitored (sent to the PHONES jack and shown on the display). When in ISB, the upper sideband audio is always applied to the NORM audio line and the lower sideband audio is always applied to the ALTN audio line on the rear panel connector. Separate AGC and squelch settings are available for each sideband.

The ISB monitor mode may be changed when the m eter display is shown. Press the MTR/MNU key as shown below to select the meters display.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

The following display appears.

ISB Monitor Soft Key Menu.

(RF Meter Display) (AF Meter Display)

Press SELECT to toggle the ISB monitor mode (Upper or Lower).

SELECT

MTR

MNU

MTR

MNU

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ISB FM FSK CANCEL

MODE - NEXT Soft Key Menu.

MTR

MNU

When FSK is selected, the following menu appears.

MODE - NEXT - FSK Soft Key Menu.

VNAR NAR MED WIDE CANCEL

MTR

MNU

Press the desired FSK shift value where VNAR = 50 Hz, NAR = 85 Hz, MED = 170 Hz, and WIDE = 850 Hz.

3-7.2.3 Bandwidth.

This function sets or changes the receiver bandwidth.

NOTE

In ISB mode the bandwidth is fixed at 2.8 kHz. In USB, LSB, or CW, only bandwidths between 100 Hz and 6.0 kHz can be selected. In AM or FM modes all bandwidths between 100 Hz and 16.0 kHz may be selected.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

Press BW to change the bandwidth. The following menu appears.

BW Soft Key Menu.

300* 1.0* 2.8* 6.0* CANCEL

Press the desired bandwidth key or press the NEXT key to display additional bandwidths.

BW - NEXT Soft Key Menu.

600* 2.0* 8.0* TABLE CANCEL

Press the desired bandwidth key or press the TABLE key for additional bandwidths.

*Operator assignable value. May be different than shown.

MTR

MNU

MTR

MNU

MTR

MNU

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BW - NEXT - TABLE Soft Key Menu.

ASSIGN DEFLT ENTER CANCEL

MTR

MNU

When the TABLE key is pressed BW: XXX is shown in the display. Rotate the main adjustment knob to select and change one of fifty-one bandwidths from 100 Hz to 16.0 kHz (or 6.0 kHz) depending on receive mode. After the desired bandwidth is displayed, press the ENTER key to enter the receiver bandwidth and exit the Bandwidth menu. If the CANCEL key is pressed instead of the ENTER key, the receiver reverts back to the original bandwidth.

3-7.2.3.1 Assigning Bandwidths to Soft Key Labels.

The bandwidth soft key labels may be assigned different values from the bandwidth table using the A SSIGN function. To assign the bandwidths select the BW - NEXT - TABLE soft key menu as shown below. Rotate the main adjustment knob to select the desired bandwidth in the display.

BW - NEXT - TABLE Soft Key Menu.

ASSIGN DEFLT ENTER CANCEL

MTR

MNU

Press the ASSIGN key to select the desired bandwidth from the table to the soft key menu. The following menu is displayed.

BW - NEXT - TABLE - ASSIGN Soft Key Menu.

300* 1.0* 2.8* 6.0* RETURN

MTR

MNU

Press the desired soft key to reassign to a bandwidth, or press the NEXT key to display the additional bandwidth menu.

BW - NEXT - TABLE - ASSIGN - NEXT Soft Key Menu.

600* 2.0* 8.0* RETURN

Press the desired soft key to assign to a bandwidth. The following menu is displayed.

BW - NEXT - TABLE Soft Key Menu.

MTR

MNU

ASSIGN DEFLT ENTER CANCEL

Press the CANCEL key or assign additional bandwidths if desired.

MTR

MNU

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3-7.2.3.2 Assigning Default Bandwidths To Receive Modes. Bandwidths may be assigned to receive modes as default settings using the DEFLT function. To assign the bandwidths select the BW - NEXT - TABLE soft key menu as shown below. Rotate the main adjustment knob to select the desired bandwidth as shown in the display.

NOTE

The desired receive mode (to be assigned a bandwidth value) must be selected before selecting this function. USB and LSB share the same default bandwidth. Mode default settings may be enabled or disabled through keypad configuration. Refer to section 3-7.5.2.3.

BW - NEXT - TABLE Soft Key Menu.

ASSIGN DEFLT ENTER CANCEL

Press the DEFLT key and the following menu appears.

BW - NEXT - TABLE - DEFLT Soft Key Menu.

ENTER CANCEL

Press the ENTER key to assign the bandwidth to the selected receive mode.

3-7.2.4 Squelch.

This function sets or changes the receiver squelch level.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

Press the SQELCH key to select the SQELCH menu.

MTR

MNU

MTR

MNU

MTR

MNU

SQELCH Soft Key Menu.

BKSP ENTER CANCEL

Enter the squelch level in dBm using the keypad or main adjustment knob. Range = -000.0 dBm to -115.5 dBm. Press ENTER when done.

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3-7.2.5 Gain. This function sets or changes the receiver gain control mode or selects the AGC decay time.

NOTE

Gain soft key selections are different depending on receive mode selected. AGC decay time is fixed in both AM and FM modes at 0.05 seconds. Additionally, the FM mode uses Fast Attack/Slow Decay in all bandwidths greater than 6 kHz. Refer to the appropriate section below.

AM or FM Mode Selected.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

MTR

MNU

Press the GAIN key to select the AGC or MGC. The following menu appears.

GAIN Soft Key Menu.

AGC MGC CANCEL

MTR

MNU

Press the AGC key to select automatic gain control, or press the MGC key to select manual gain control. If MGC is selected, the following menu appears.

GAIN - MGC Soft Key Menu.

BKSP ENTER CANCEL

MTR

MNU

Select the manual gain value using the keypad or main adjustment knob. Press the ENTER key when the desired manual gain is displayed. Range = -000.0 dB to -127.5 dB in .5 dB steps.

Any Other Mode Selected.

Primary Soft Key Menu.

FREQ MODE BW SQELCH GAIN

Press the GAIN key to select the AGC or MGC. The following menu appears. The numeric key labels in the display indicate AGC decay times in seconds.

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0.02* 0.20* 3.00* MGC CANCEL

GAIN Soft Key Menu.

MTR

MNU

Press the desired AGC decay setting, or press the NEXT key for more settings.

GAIN - NEXT Soft Key Menu.

0.10* 0.60* 1.00* TABLE CANCEL

Press the desired AGC decay setting, or press the TABLE key for more settings.

GAIN - NEXT - TABLE Soft Key Menu.

MTR

MNU

ASSIGN DEFLT ENTER CANCEL

MTR

MNU

Select the AGC decay value using the main adjustment knob only. Range = 0.00 sec. to 4.00 sec. Press the ENTER key when done.

GAIN Soft Key Menu.

0.02* 0.20* 3.00* MGC CANCEL

MTR

MNU

When the GAIN soft key menu is displayed, press the MGC key to select manual gain control. The following menu appears.

GAIN - MGC Soft Key Menu.

BKSP ENTER CANCEL

MTR

MNU

Select the manual gain value using the keypad or main adjustment knob. Press the ENTER key when the desired manual gain is displayed. Range = -000.0 dB to -127.5 dB in .5 dB steps.

*Operator assignable value. May be different than shown.

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3-7.2.5.1 Assigning AGC Decay Time Values to Soft Key Labels. The AGC soft key labels may be assigned different values from the AGC table using the ASSIGN function. To assign the AGC labels, select the GAIN - NEXT - TABLE soft key menu as shown below. Rotate the main adjustment knob to select the desired AGC time as shown in the display.

GAIN - NEXT - TABLE Soft Key Menu.

ASSIGN DEFLT ENTER CANCEL

MTR

MNU

Press the ASSIGN key to select the desired AGC decay time from the table. The following menu is displayed.

GAIN - NEXT - TABLE - ASSIGN Soft Key Menu.

0.02* 0.20* 3.00* RETURN

MTR

MNU

Press the desired soft key to reassign to an AGC decay time, or press the NEXT key to display the additional AGC soft key menu.

GAIN - NEXT - TABLE - ASSIGN - NEXT Soft Key Menu.

0.10* 0.60* 1.00* RETURN

MTR

MNU

Press the desired soft key to reassign to an AGC decay time. The following menu is displayed.

GAIN - NEXT - TABLE Soft Key Menu.

ASSIGN DEFLT ENTER CANCEL

MTR

MNU

Press the CANCEL key or assign additional AGC soft keys if desired.

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3-7.2.5.2 Assigning Default AGC Values To Receive Modes. AGC values may be assigned to receive modes as default settings using the DEFLT function. To assign the AGC values, select the GAIN - NEXT - TABLE soft key menu as shown below.

NOTE

The desired receive mode (to be assigned an AGC value) m ust be selected before selecting this function. USB and LSB share the same default AGC value. Mode default settings may be enabled or disabled through keypad configuration. Refer to paragraph 3-7.5.2.3.

GAIN - NEXT - TABLE Soft Key Menu.

ASSIGN DEFLT ENTER CANCEL

MTR

MNU

Rotate the main adjustment knob to select the desired AGC as shown in the display. Press the DEFLT key and the following menu appears.

GAIN - NEXT - TABLE - DEFLT Soft Key Menu.

ENTER CANCEL

MTR

MNU

Press the ENTER key to assign the AGC setting to the selected receive mode.

3-7.3 Secondary Soft Key Menu.

The following paragraphs detail parameter entry from the secondary soft key m enu. To

display the secondary soft key menu, press the NEXT key from the primary soft key menu.

3-7.3.1 BFO.

This function can only be set in the CW reception mode and is used to vary the tone of the beat note produced

by the received signal and the beat frequency oscillator (BFO).

Secondary Soft Key Menu.

BFO IF SHF SKIP STORE RECALL

MTR

MNU

Select BFO to change the BFO setting. The following menu appears.

BFO Soft Key Menu.

+/- 7RATE BKSP ENTER CANCEL

Select the BFO frequency using the +/- key on the soft key menu and the numeric keys, or use the main adjustment knob. Repeatedly pressing the RATE key moves a bar under the digits in the display. The bar under the digit indicates the tuning resolution of the main adjustment knob.

Press ENTER when the desired BFO frequency is displayed. Range = -6.000 to +6.000 kHz.

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3-7.3.2 IF Shift. This function can only be set in the CW reception mode and is used to shift the bandpass up or down from the displayed frequency. This function helps reduce reception of unwanted adjacent signals.

Secondary Soft Key Menu.

BFO IF SHF SKIP STORE RECALL

MTR

MNU

Select IF SHF to select the IF shift. The following menu appears.

IF SHF Soft Key Menu.

+/- 7RATE BKSP ENTER CANCEL

MTR

MNU

Select the amount the IF is shifted using the +/- key on the soft key menu and the numeric keys, or use the main adjustment knob. Repeatedly pressing the RATE key moves a bar under the digits in the display. The bar indicates the tuning resolution of the main adjustment knob. Press ENTER when the desired IF shift is displayed. Range = -6.000 to +6.000 kHz.

3-7.3.3 Skip.

This function sets (or clears) the skip flag associated with the current receiver operating parameters. If these parameters are stored in a memory channel, that channel will be skipped (or not skipped) in any subsequent sweep or scan operation. When the skip flag is set, "SKIP" will appear in the display.

Secondary Soft Key Menu.

BFO IF SHF SKIP STORE RECALL

MTR

MNU

Press the SKIP key to toggle the skip flag on or off.

3-7.3.4 Store.

This function stores all current receiver parameters in a selected memory channel. All receiver parameters are first entered using the keypad and/or main adjustment knob. The memory channel is then selected and all data is copied to the memory c hannel.

The following parameter settings may be stored in each memory channel: Frequency, receive mode, bandwidth, AGC on or off, normal channel AGC decay, alternate channel (ISB) AGC decay, manual gain, BFO, skip flag on or off, normal channel squelch, alternate channel (ISB) squelch, IF shift, step size, dwell time, and bridge time.

Secondary Soft Key Menu.

BFO IF SHF SKIP STORE RECALL

MTR

MNU

Press the STORE key to store current parameters in a memory channel. The following menu appears.

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STORE Soft Key Menu.

BKSP ENTER CANCEL

MTR

MNU

Select a memory channel to store current parameters using the numeric keys or m ain adjustm ent knob. Press the ENTER key when the desired channel is displayed. Range = 000 to 249.

NOTE

The BKSP key erases the previously entered digit if the keypad is used for numeric entry.

3-7.3.5 Recall.

This function recalls all receiver parameters for a selected memory channel as current receiver parameters.

Secondary Soft Key Menu.

BFO IF SHF SKIP STORE RECALL

Press the RECALL key to recall memory channel parameters. The following menu appears.

RECALL Soft Key Menu.

MTR

MNU

AUDTON BKSP ENTER CANCEL

MTR

MNU

Select a memory channel for display using the numeric keys or main adjustment knob. When the desired channel is displayed, press ENTER to select that channel and return to normal operation. Range = 000 to 249.

NOTE

When AUDTON (audition) is off, the contents of a selected memory channel is shown on the display but the receiver remains set to current parameters. When AUDTON is on, the contents of the selected memory channel are displayed, and the receiver changes to the parameters set in the memory channel recalled as the channel number is varied.

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3-7.4 Scan/Sweep Soft Key Menu.

The following paragraphs detail parameter entry from the sweep/scan soft key menu. To display the sweep/scan soft key menu, press the NEXT key from the secondary soft key menu.

3-7.4.1 Scan.

NOTE

Before performing a scan function, frequencies and other parameters to be sampled should be determined and set into designated memory channels.

Scan is the sequential continuous recall of a sequence of memory channels. The CPU in the receiver uses the data stored in each channel to select frequency, mode, bandwidth, squelch level, gain, dwell time, bridge time and all other stored parameters to operate the receiver. The receiver will stop on a frequency (for the current dwell time) when a received signal exceeds the squelch level set in the channel. If the signal goes away before the dwell timer has timed out, the receiver will continue to scan. If the dwell timer times out before the signal goes away the receiver continues the scan. If the dwell time is set to zero, the receiver remains on frequency until the signal falls below the squelch level, and then continues the scan. The operator may offset the squelch level from the value set in each memory channel before starting the scan.

Scan/Sweep Soft Key Menu.

SCAN SWEEP STEP DWELL BRIDGE

MTR

MNU

Press the SCAN key and the following menu appears.

Scan/Sweep - SCAN Soft Key Menu.

FROM TO OFFSET SCAN DONE

Press the FROM key and the following menu appears.

Scan/Sweep - SCAN - FROM Soft Key Menu.

MTR

MNU

BKSP ENTER RETURN

MTR

MNU

Select the desired starting channel using the keypad or main adjustment knob, and press ENTER. The m enu will switch back to the Scan/Sweep - SCAN menu as shown below.

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FROM TO OFFSET SCAN DONE

Scan/Sweep - SCAN Soft Key Menu.

MTR

MNU

Press the TO key and the following menu appears.

Scan/Sweep - SCAN - TO Soft Key Menu.

BKSP ENTER RETURN

MTR

MNU

Select the desired ending channel using the keypad or main adjustment knob, and press ENTER. The menu will switch back to the Scan/Sweep - SCAN menu as shown below.

Scan/Sweep - SCAN Soft Key Menu.

FROM TO OFFSET SCAN RETURN

MTR

MNU

Press OFFSET (if desired) to offset the scan squelch level for all channels during the scan. The receiver normally uses the squelch level set into each channel throughout the scan. The following menu appears if OFFSET is selected.

Scan/Sweep - SCAN - OFFSET Soft Key Menu.

+/- BKSP ENTER RETURN

MTR

MNU

Select the desired squelch offset setting and press ENTER. The menu will switch back to the Scan/Sweep - SCAN menu as shown below.

Scan/Sweep - SCAN Soft Key Menu.

FROM TO OFFSET SCAN DONE

Press the NEXT key and the following appears

MTR

MNU

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Scan/Sweep - SCAN - NEXT Soft Key Menu.

RATE SCAN DONE

MTR

MNU

Press the RATE key to change the scan rate, and the following menu appears.

Scan/Sweep - SCAN - NEXT - RATE Soft Key Menu.

BKSP ENTER RETURN

MTR

MNU

Change the scan rate using the main adjustment knob and press the ENTER key. The following menu appears.

Scan/Sweep - SCAN Soft Key Menu

FROM TO OFFSET SCAN DONE

MTR

MNU

Press the SCAN key to start the scan. The receiver will scan channels between the FROM and TO channels selected. The following menu appears.

Scan/Sweep - SCAN - SCAN Soft Key Menu.

STOP CONT SKIP RETURN

MTR

MNU

Press STOP to stop the scan, or CONT to continue the scan after stopping. Press SKIP to skip a channel when dwelling or bridging on that channel, and to set the skip flag for that channel. That channel will be skipped during sweep or scan until the skip flag is cleared. Rotate the knob to change the scan rate during the scan if desired.

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3-7.4.2 Sweep.

NOTE

Before performing a sweep function, frequencies and other parameters to be sampled should be determined and set into designated memory channels.

Sweep is the sequential stepping of the receiver frequency between a designated frequency in a FROM memory channel to the designated frequency in a TO memory channel. The FROM frequency is selected from an even 004, etc.). The TO frequency is selected from an odd

numbered channel (001, 003, 005, etc.). Since there are 250 channels

numbered channel (000, 002,

(000 - 249), up to 125 bands of frequencies can be swept depending on TO/FROM channel selection.

The receiver may be set to sweep in two different ways; single band sweep, and multi-band sweep. Each is described below.

A. Single-Band Sweep

In a single-band sweep the TO channel is always the next higher numerical channel above the FROM channel. Only the frequencies between the FROM channel and the next higher TO channel are swept. All parameters (initial frequency, threshold level, reception mode, bandwidth, AGC, frequency step size, skip flag, etc.) used during the sweep are selected from the FROM channel.

The frequency step size contained in the FROM channel controls the amount the frequency is incremented during the sweep. The sweep continues until the frequency would exceed the frequency stored in the TO channel. When the frequency in the TO channel would be exceeded, the sweep starts over starting with the frequency in the FROM channel. The sweep continues over and over again until the STOP key is pressed.

SINGLE-BAND SWEEP EXAMPLE:

FROM Channel TO Channel

000 001 Frequency = 10.000000 Frequency = 11.000000 Step size = 0.050000

FROM CHANNEL TO CHANNEL

SWEEP_S.FLO

40606

CHANNELS SWEPT

000 001

Frequencies swept = 10.000000, 10.050000, 10.100000, 10.150000, 10.200000, 10.250000, .......10.950000,

11.000000, 10.000000, 10.050000 etc.

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B. Multi-Band Sweep.

In a multi-band sweep the TO channel is higher than the next higher numerical channel above the FROM channel. Frequencies between the FROM channel and the next higher odd channel will be swept like the single-band sweep. However, instead of going back to the FROM channel, the parameters from the next higher even number channel are used and the sweep continues. The step size contained in each of the even numbered channels in the sweep controls the amount the frequency is incremented during the sweep of that band. The sweep continues (with each band's parameters determined by successive even numbered channels) until the frequency would exceed the frequency stored in the TO channel. When the frequency in the TO channel would be exceeded, the sweep starts over starting with the frequency in the FROM channel. The sweep continues over and over again until the STOP key is pressed.

MULTI-BAND SWEEP EXAMPLE:

FROM Channel FROM Ch +1 Next Even Ch Next Even Ch +1 TO Ch -1 (even) TO Channel

000 001 002 003 004 005 Frequency = 10.000000 Frequency = 11.000000 23.000000 23.999999 15.000000 16.000000 Step size = 0.050000 Step size = 0.100000 Step size = 0.100000

CHANNELS SWEPT

FROM CHANNEL TO CH

000 001 002 003 004 005

Sweep starts using the frequency and all other parameters contained in memory channel 000. When the frequency in channel 001 would be exceeded, the sweep continues using the frequency and all other parameters in channel 002. When the frequency in channel 003 would be exceeded, the sweep continues using the frequency and all other parameters in channel 004. When the frequency in channel 005 would be exceeded, the sweep starts over again using the frequency and all other parameters in channel 000.

Frequencies swept = 10.000000, 10.050000, 10.100000, 10.150000, 10.200000, 10.250000, .......10.950000,

11.000000, 23.000000, 23.100000, 23.200000, ....... 23.800000, 23.900000, 15.000000, 15.100000, 15.200000,

15.300000,........15.900000, 16.00000, 10.000000, 10.050000, 10.150000, etc.

NOTE

If the skip flag is set in a particular even numbered channel in the sequence, the receiver will immediately skip to the next consecutive even numbered channel.

The receiver will stop on a frequency (for the current dwell time), when the signal exceeds the preset threshold level. If the signal goes away before the dwell timer has timed out, the receiver will continue the sweep. If the dwell timer tim es out before the signal goes away the receiver continues the sweep. If the dwell time is set to zero, the receiver remains on frequency until the signal falls below the preset threshold level. The operator may offset the threshold level from the value set i n the even numbered channels before starting the sweep. If th e frequency in the TO channel is lower than the frequency in the FROM channel, the receiver sweeps from the higher to the lower frequency.

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To start and stop the sweep function, do the following:

Scan/Sweep Soft Key Menu.

SCAN SWEEP STEP DWELL BRIDGE

MTR

MNU

Press the SWEEP key and the following menu appears.

Scan/Sweep - SWEEP Soft Key Menu.

FROM TO OFFSET SWEEP DONE

Press the FROM key and the following appears.

Scan/Sweep - SWEEP - FROM Soft Key Menu.

MTR

MNU

BKSP ENTER RETURN

MTR

MNU

Select the desired even numbered channel containing the sweep starting frequency and press ENTER. The menu will switch back to the Scan/Sweep - SWEEP menu as shown below.

Scan/Sweep - SWEEP Soft Key Menu.

FROM TO OFFSET SWEEP DONE

Press TO key and the following appears.

Scan/Sweep - SWEEP - TO Soft Key Menu.

MTR

MNU

BKSP ENTER RETURN

MTR

MNU

Select the desired odd numbered channel containing the sweep ending frequency and press ENTER. The menu will switch back to the Scan/Sweep - SWEEP menu as shown below.

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Scan/Sweep - SWEEP Soft Key Menu.

FROM TO OFFSET SWEEP DONE

MTR

MNU

Press OFFSET (if desired) to offset the sweep squelch level during the sweep. The receiver adds the offset value to the squelch level setting for each even channel in the sweep. The following menu appears if OFFSET is selected.

Scan/Sweep - SWEEP - OFFSET Soft Key Menu.

+/- BKSP ENTER RETURN

MTR

MNU

Select the desired squelch offset setting and press ENTER. The menu will switch back to the Scan/Sweep - SWEEP menu as shown below.

Scan/Sweep - SWEEP Soft Key Menu.

FROM TO OFFSET SWEEP DONE

Press the NEXT key and the following menu appears.

MTR

MNU

Scan/Sweep - SWEEP - NEXT Soft Key Menu.

RATE SWEEP DONE

Press the RATE key to change the sweep rate, and the following menu appears.

Scan/Sweep SWEEP - NEXT - RATE Soft Key Menu.

MTR

MNU

BKSP ENTER RETURN

MTR

MNU

Change the sweep rate using the main adjustment knob and press the ENTER key. The following menu appears.

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FROM TO OFFSET SWEEP DONE

Scan/Sweep - SWEEP Soft Key Menu.

MTR

MNU

Press the SWEEP key to start the sweep. The receiver will sweep the band or bands of frequencies between the FROM and TO channel frequencies using the parameters set in the FROM channel. The following menu appears.

Scan/Sweep - SWEEP - SWEEP Soft Key Menu.

STOP CONT SKIP RETURN

MTR

MNU

Press STOP to stop the sweep, CONT to continue the sweep after stopping. Press SKIP to skip an unwanted frequency when dwelling or bridging on that frequency and to store the frequency in the list of skip frequencies used during sweep. Rotate the knob to change the sweep rate during the sweep if desired.

3-7.4.3 Step.

When the sweep function is enabled, the receiver will sample a selected frequency, and then "step" to the next

frequency. The step function determines the amount of frequency change between steps.

NOTE

The step setting may also be used as the frequency increment when tuning the receiver manually with the FREQ soft key menu and the main adjustment knob. This allows frequency increments other than powers of ten to be assigned to the knob.

Scan/Sweep Soft Key Menu.

SCAN SWEEP STEP DWELL BRIDGE

MTR

MNU

Press the STEP key to select the step frequency size for the sweep function. The following menu appears.

STEP Soft Key Menu.

7RATE RATE6 BKSP ENTER CANCEL

MTR

MNU

Select the step frequency size with the numeric keys, or main adjustment knob. Pressing the RATE keys to move a bar under the digits in the display. The ba r u nder the digit indicates the tuning resolution of the main adjustment knob. Press ENTER when the desired step frequency size is displayed.

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3-7.4.4 Dwell. The dwell time setting is the time duration (in seconds) the receiver remains on a channel or frequency that has exceeded the squelch level. This function is only used in the scan or sweep function. If the dwell time is set to zero, and the signal exceeds the squelch level, the receiver will stay on this channel or frequency until the signal falls below the squelch level. (See figure 3-8)

Scan/Sweep Soft Key Menu.

SCAN SWEEP STEP DWELL BRIDGE

MTR

MNU

Press the DWELL key to select the dwell on signal time for sweep or scan. The following menu appears.

DWELL Soft Key Menu.

ENTER CANCEL

MTR

MNU

Select the desired dwell on signal time for the s w e e p and scan function. Enter 0 for no time-out. Press ENTER when done. Range = 0 - 9 seconds.

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DWELL = 0 SEC. BRIDGE = 0 SEC.

DWELL = 0 SEC. BRIDGE = 2 SEC.

DWELL = 2 SEC. BRIDGE = 0 SEC.

SIGNAL

RECEIVER CONTINUES SWEEP OR SCAN

BRIDGE

TIME

RECEIVER CONTINUES SWEEP OR SCAN

DWELL

TIME

RECEIVER CONTINUES SWEEP OR SCAN

DWELL = 2 SEC. BRIDGE = 2 SEC.

SIGNAL

DWELL

TIME

DWELL

TIME

DWELL

TIME

DWELL

TIME

RECEIVER CONTINUES SWEEP OR SCAN

BRIDGE

TIME

RECEIVER CONTINUES SWEEP OR SCAN

BRIDGE

TIME

DWELL

TIME

BRIDGE

DWELL

TIME

BRIDGE

TIME

DWELL

TIME

BRIDGE

TIME

RECEIVER REMAINS ON FREQUENCY CONTINUOUSLY

Figure 3-8 Dwell Time/Bridge Time Relationship.

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3-7.4.5 Bridge. (See figure 3-8.) The bridge time functi on may be used to monitor intermittent signals. This function supplements the dwell time function by causing the receiver to stay on frequency longer than the preset dwell tim e during sweep or scan. The bridge timer is activated during dwell time if a signal is present and then goes below the preset squelch level. If the signal returns before bridge timeout, dwell time is restarted from zero. The receiver stays on a frequency where intermittent signals are found until; (1) the signal stays on longer than the dwell time setting; or (2) the signal stays off longer than the bridge time setting. If bridge time is set to zero, the bridge timer is disabled.

Scan/Sweep Soft Key Menu.

SCAN SWEEP STEP DWELL BRIDGE

MTR

MNU

Press the BRIDGE key to select the bridge time between signals for the sweep and scan function. The following menu appears.

BRIDGE Soft Key Menu.

ENTER CANCEL

MTR

MNU

Enter the bridge time using the keys or main adjustment knob. Enter 0 for no bridge time. Press ENTER when done. Range = 0 - 9 seconds.

3-7.5 Utility Soft Key Menu.

The following paragraphs detail parameter entry from the utility soft key menu. To display the

utility soft key menu, press the NEXT key from the Scan/Sweep soft key menu.

3-7.5.1 Test.

This function allows selection of receiver tests.

Utility Soft Key Menu.

TEST CONFIG FAULTS SYSTEM

Press the TEST key to perform receiver tests. The following menu appears.

Utility - TEST Soft Key Menu.

BITE DSPLY DAC CANCEL

Press the BITE soft key to select the built-in test equipment test. Observe the display for fault information.

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BITE DSPLY DAC CANCEL

Utility - TEST Soft Key Menu.

MTR

MNU

Press the DSPLY soft key to select the front panel display test. After the test is complete, press any soft key when prompted. The normal display will be shown with the primary soft key menus.

Utility - TEST Soft Key Menu.

BITE DSPLY DAC CANCEL

MTR

MNU

NOTE

When this test is activated, the receiver stops processing incoming signals, and a fault indication may appear. This is normal.

Press the DAC soft key to select test outputs from the digital-to-analog converter in the digital module. The display will show what certain test point indications should be. After running the DAC test, power cycle the receiver to restart normal operation.

3-7.5.2 Configuration.

This function configures the receiver by initializing (clearing) non-volatile memory, setting the

remote control parameters, and setting the default settings.

Utility Soft Key Menu.

TEST CONFIG FAULTS SYSTEM

Press the CONFIG key to select the receiver configuration. The following menu appears.

3-7.5.2.1 Clearing Non-Volatile Memory.

To initialize (clear) non-volatile memory select the Utility - CONFIG soft key

menu as shown below.

Utility - CONFIG Soft Key Menu.

INIT REMOTE PWRDWN ROLOFF CANCEL

Press INIT to initialize (clear) the non-volatile memory. The following menu appears.

MTR

MNU

MTR

MNU

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Utility - CONFIG - INIT Soft Key Menu.

CHNL SKIP MDFLTS SFLBLS CANCEL

MTR

MNU

Press CHNL to initialize (clear) the memory channels and change them to factory default settings. The following m enu appears.

Utility - CONFIG - INIT - CHNL Soft Key Menu.

CONT CANCEL

Press CONT to continue or CANCEL to cancel the function.

To confirm the factory default settings after initialization, ensure the Mode Default function is off. The memory channel factory default settings are:

Frequency: 10.0 MHz Step size: 10 kHz Receive mode: AM Dwell time: 3 Seconds Bandwidth: 6 kHz Bridge time: 3 seconds BFO: -1000 Hz Skip flag: off AGC: ON IF Shift: 0 Hz AGC decay: 60 ms Squelch: Lower limit MGC: 0 dB

NOTE

MTR

MNU

Utility - CONFIG - INIT Soft Key Menu.

CHNL SKIP MDFLTS SFLBLS CANCEL

MTR

MNU

Press SKIP to initialize (clear) the sweep skip table of all frequencies for the sweep function. The following menu appears.

Utility - CONFIG - INIT - SKIP Soft Key Menu.

CONT CANCEL

MTR

MNU

Press CONT to continue or CANCEL to cancel the function.

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CHNL SKIP MDFLTS SFLBLS CANCEL

Utility - CONFIG - INIT Soft Key Menu.

MTR

MNU

Press MDFLTS to reset the mode default setting for BW and AGC to initial values. The following menu appears.

Utility - CONFIG - INIT - MDFLTS Soft Key Menu.

CONT CANCEL

Press CONT to continue or CANCEL to cancel the function.

Utility - CONFIG - INIT Soft Key Menu.

MTR

MNU

CHNL SKIP MDFLTS SFLBLS CANCEL

MTR

MNU

Press SFLBLS to reset the soft key labels for BW and AGC to initial values. The following menu appears.

Utility - CONFIG - INIT - SFLBLS Soft Key Menu.

CONT CANCEL

Press CONT to continue or CANCEL to cancel the function.

To initialize all of the functions press the NEXT key from the Utility - CONFIG menu.

NOTE

When the following function is performed, all non-volatile memory data will be lost.

Utility - CONFIG - INIT Soft Key Menu.

CHNL SKIP MDFLTS SFLBLS CANCEL

Press the NEXT key and the following menu appears.

MTR

MNU

MTR

MNU

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Utility - CONFIG - INIT - NEXT Soft Key Menu.

ALL MGC MD CANCEL

Press the ALL key to reset all non-volatile memory values to default settings.

Utility - CONFIG - INIT - NEXT - ALL Soft Key Menu.

CONT CANCEL

Press CONT to continue or CANCEL to cancel the function.

Utility - CONFIG - INIT - NEXT - Soft Key Menu.

ALL MGC MD CANCEL

Press MGC MD to reset the manual gain control to hard or soft. The following menu appears.

MTR

MNU

MTR

MNU

MTR

MNU

Utility - CONFIG - INIT - NEXT - MGC MD Soft Key Menu.

HARD

SOFT DONE

MTR

MNU

Press the HARD key to operate in Manual Gain Control Mode (MGC). Press the SOFT key to protect the operator from excess audio if an incoming signal exceeds the set gain threshold. By selecting the SOFT MGC mode the receiver will have a fixed gain below the selected signal level and Automatic Gain Control (AGC) above the selected signal level.

3-7.5.2.2 Configuring Receiver Remote Control Operation.

Two basic remote control buses are optionally available; serial

or IEEE-488. Refer to the correct sub-paragraph below for the installed configuration.

3-7.5.2.2.1 Serial Bus.

(If so equipped). To configure the receiver serial bus remote control operation, select the Utility -

CONFIG soft key menu as shown below.

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INIT REMOTE PWRDWN ROLOFF CANCEL

Utility - CONFIG Soft Key Menu.

MTR

MNU

Press REMOTE to change the remote control bus configuration. The following menu appears.

Utility - CONFIG - REMOTE Soft Key Menu.

ADDRS TYPE RATE BITS DONE

Press ADDRS to select the receiver's bus address. The following menu appears.

Utility - CONFIG - REMOTE Soft Key Menu.

MTR

MNU

BKSP ENTER RETURN

MTR

MNU

Enter the receiver's bus address using the keypad or knob (range = 000 - 254). Press ENTER when done.

NOTE

Pressing the RETURN key switches to the Utility - CONFIG REMOTE soft key menu without changing the original address.

Utility - CONFIG - REMOTE Soft Key Menu.

ADDRS TYPE RATE BITS DONE

Press the TYPE key to select the remote control bus type. The following menu appears.

Utility - CONFIG - REMOTE - TYPE Soft Key Menu.

MTR

MNU

RS-232 RS-422 RETURN

MTR

MNU

Press the desired remote control bus type key.

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Utility - CONFIG - REMOTE Soft Key Menu.

ADDRS TYPE RATE BITS DONE

Press the RATE key to change the serial bus rate. The following menu appears.

Utility - CONFIG - REMOTE - RATE Soft Key Menu.

125000 38400 19200 9600 RETURN

Select the desired serial bus baud rate, or press the NEXT key and the following menu appears.

Utility - CONFIG - REMOTE - RATE - NEXT Soft Key Menu.

4800 2400 1200 600 RETURN

Select the desired serial bus baud rate or press the NEXT key again.

Utility - CONFIG - REMOTE - RATE - NEXT - NEXT Soft Key Menu.

300 150 110 75 RETURN

MTR

MNU

MTR

MNU

MTR

MNU

MTR

MNU

Select the desired serial bus baud rate, or press the NEXT key to return to the first RATE menu.

Utility - CONFIG - REMOTE Soft Key Menu.

ADDRS TYPE RATE BITS DONE

MTR

MNU

Press the BITS key to configure the serial bus line parameters. The following menu appears.

Utility - CONFIG - REMOTE - BITS Soft Key Menu.

89ENTER RETURN

MTR

MNU

Press the up or down arrows to select new line parameters as shown on the display and listed in the following table. Press the ENTER key when the desired parameters are displayed.

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DATA BITS STOP BIT PARITY

8 2 ODD 8 1 ODD 7 2 ODD 7 1 ODD 8 2 EVEN 8 1 EVEN 7 2 EVEN 7 1 EVEN 82NO 81NO 72NO 71NO

Utility - CONFIG - REMOTE Soft Key Menu.

ADDRS TYPE RATE BITS DONE

MTR

MNU

Press the DONE key to return to the primary soft key menu, press the NEXT key and the following menu appears.

Utility - CONFIG - REMOTE - NEXT Soft Key Menu.

SHARE IDENT DONE

Press the SHARE key to select party line or single bus. The following menu appears.

Utility - CONFIG - REMOTE - NEXT - SHARE Soft Key Menu.

MTR

MNU

ENAB DISAB RETURN

Press ENAB to enable bus sharing for party line bus, or select DISAB for single receiver on bus.

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Utility - CONFIG - REMOTE - NEXT Soft Key Menu.

SHARE IDENT DONE

MTR

MNU

Press the IDENT key to send the identification message out over the bus. The message identifies the manufacturer, the equipment name, the firmware version number, and date, and copyright notice. This message is less than 125 characters long.

3-7.5.2.2.2 IEEE-488 Bus.

(If so equipped). To configure the receiver IEEE-488 bus remote control operation, select the

Utility - CONFIG soft key menu as shown below.

Utility - CONFIG Soft Key Menu.

INIT REMOTE PWRDWN ROLOFF CANCEL

Press REMOTE to change the remote control bus configuration. The following menu appears.

Utility - CONFIG - REMOTE Soft Key Menu.

MTR

MNU

ADDRS DONE

MTR

MNU

Press ADDRS to select the receiver's bus address. The following menu appears.

Utility - CONFIG - REMOTE Soft Key Menu.

BKSP ENTER RETURN

MTR

MNU

Enter the receiver's bus address using the keypad or knob (range = 000 - 030). Press ENTER when done.

3-7.5.2.3 Configuring Receiver Default Settings.

To configure the receiver's default settings select Utility - CONFIG soft

key menu as shown below.

Utility - CONFIG Soft Key Menu.

INIT REMOTE PWRDWN ROLOFF CANCEL

MTR

MNU

Select PWRDWN to determine if the current receiver operating parameters will be saved or not when the receiver is turned off. The following menu appears.

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Utility - CONFIG - MEMORY Soft Key Menu.

NO YES CANCEL

MTR

MNU

Press NO or YES as desired, and the display goes back to the primary menu.

Utility - CONFIG Soft Key Menu.

INIT REMOTE PWRDWN ROLOFF CANCEL

MTR

MNU

Press ROLOFF to set the low frequency -3 dB corner in Hertz for the SSB modes. The following menu appears. Choose the desired roll off using the main adjustment knob. (Range = 0 - 1,000 Hz.)

Utility - CONFIG - ROLOFF Soft Key Menu.

ENTER CANCEL

Press ENTER to select the displayed roll off.

MTR

MNU

Utility - CONFIG Soft Key Menu.

INIT REMOTE PWRDWN ROLOFF CANCEL

MTR

MNU

Press the NEXT key. The following menu appears.

Utility - CONFIG - NEXT Soft Key Menu.

MDFLTS NBIF CANCEL

MTR

MNU

Press the MDFLTS key to turn the BW and AGC mode defaults on or off. The following menu appears.

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Utility - CONFIG - NEXT MDFLTS Soft Key Menu.

ON OFF CANCEL

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MNU

Press the ON or OFF key to select whether default values for BW and AGC are selected when the receive mode is changed. The display returns to the Primary Menu.

Utility - CONFIG - NEXT Soft Key Menu.

MDFLTS NBIF CANCEL

MTR

MNU

Press the NBIF key to adjust the NBIF output center frequency over a limited range of frequencies. The following menu appears.

Utility - CONFIG - NEXT Soft Key Menu.

INVERT ENTER CANCEL

MTR

MNU

Press the INVERT key to select an invert output spectrum or a normal non-invert output spectrum. Adjust the frequency range by rotating the adjustment knob.

NOTE

Units with a low pass filter output circuit, the frequency range is 8-30 kHz. Units with a bandpass filter output circuit, the frequency range is 450-460 kHz. These values are saved in non-volatile memory and needs to be set once unless EEPROM memory is cleared. When this occurs, the value is set to +455 kHz. (Units with the low pass filter output circuit, this will produce an output centered at 20 kHz inverted.

3-7.5.3 Faults.

This function allows review of current or cumulative faults.

Utility Soft Key Menu.

TEST CONFIG FAULTS SYSTEM

Press FAULTS key to show the current or cumulative faults in the receiver. The following menu appears.

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89CURNT CUMUL CANCEL

Utility - FAULTS Soft Key Menu.

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MNU

The initial display shows the current fault status. Press CUMUL to switch to display of cumulative faults since power was turned on. Press CURNT to switch back to display of c urrent faults. When pressed, the

8 9 keys allow scrolling through

multiple faults. Up to 16 current (CURNT) or cumulative (CUMUL) faults may be displayed. If the fault light is lit on the vacuum fluorescent display, press the CURNT key to display the fault list. The faults do not appear in any significant or de r on the list. To display the cumulative faults that have occurred since the receiver was turned on, press the CUMUL key. Identical recurring faults will only appear once on the list. Refer to paragraph 5-5.2.3 for details.

3-7.5.4 System.

This function allows selection of system related items including: software version identification, display

intensity, sound, and menu display default.

Utility Soft Key Menu.

TEST CONFIG FAULTS SYSTEM

Press SYSTEM to select system related items. The following soft key menu appears.

Utility - SYSTEM Soft Key Menu.

MTR

MNU

ABOUT INTENS SOUND MENUS CANCEL

MTR

MNU

Press the ABOUT key to display the receiver identification and software version number. Press the NEXT key to show the DSP firmware version number. Press any soft key to return to the normal display.

Utility - SYSTEM Soft Key Menu.

ABOUT INTENS SOUND MENUS CANCEL

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MNU

Press the INTENS key to change the intensity of the front panel display. The following soft key menu appears.

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Utility - INTENS Soft Key Menu.

62.5% 75% 87.5% 100% DONE

MTR

MNU

Select the desired display intensity, and press DONE; or press the NEXT key and the following menu appears.

NOTE

Display may not be visible in bright ambient light if 5% intensity is selected.

Utility - INTENS - NEXT Soft Key Menu.

5% 12.5% 25% 50% DONE

MTR

MNU

Select the desired display intensity, and press DONE; or press the NEXT key to return to the previous menu.

Utility - SYSTEM Soft Key Menu.

ABOUT INTENS SOUND MENUS CANCEL

MTR

MNU

Press the SOUND key to select the sound options. The following menu appears.

Utility - SYSTEM - SOUND Soft Key Menu.

CLICK BEEP DONE

MTR

MNU

Press CLICK to enable key clicks on or off when keys are pressed. The following menus appears.

Utility - SYSTEM - SOUND - CLICK Soft Key Menu.

ON OFF RETURN

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MNU

Select ON or OFF. Press RETURN to return to the previous menu.

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Utility - SYSTEM - SOUND Soft Key Menu.

CLICK BEEP DONE

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MNU

Press BEEP to enable warning beeps. The following menus appears.

Utility - SYSTEM - SOUND - BEEP Soft Key Menu.

ON OFF RETURN

MTR

MNU

Select ON or OFF. Press RETURN to return to the previous menu.

Utility - SYSTEM Soft Key Menu.

ABOUT INTENS SOUND MENUS CANCEL

MTR

MNU

Press MENUS to display the soft key menus or the meters as the default. The following menu appears.

Utility - SYSTEM - MENUS Soft Key Menu.

MENUS METERS CANCEL

MTR

MNU

Press the MENUS key to set the normal display to show the soft key menus as the default. Press the METERS key to set the normal display to show the meters as the default. When METERS is the default, menus may be accessed directly from a meters display as discussed in paragraph 3-2.2.1.3.

Utility - SYSTEM Soft Key Menu.

ABOUT INTENS SOUND MENUS CANCEL

Press the NEXT key and the following menu appears.

MTR

MNU

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Utility - SYSTEM - NEXT Soft Key Menu.

MTR

MNU

Press the MEMORY key to observe the HEX/ASCII display of memory (factory use only). The following menu appears.

Utility - SYSTEM - NEXT - MEMORY Soft Key Menu.

ADDRS DONE

MTR

MNU

Use the main adjustment knob to scroll through the memory locations, or press the ADDRS key and the following menu appears.

Utility - SYSTEM - NEXT - MEMORY - ADDRS Soft Key Menu.

A B C ENTER CANCEL

MTR

MNU

Use the numeric keypad and the letter soft keys above to select specific hexadecimal memory locations for display. To enter hexadecimal letters D, E, and F, press the NEXT key and the following menu appears.

Utility - SYSTEM - NEXT - MEMORY - ADDRS - NEXT Soft Key Menu.

D E F ENTER CANCEL

Select the desired address location and press ENT.

MTR

MNU

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Section II. REMOTE CONTROL

Two different interface standards are available for the CDR-3250/80 receiver: Serial and IEEE-488. The serial interface includes both unbalanced (RS-232) and balanced (RS-422) line interfaces. To configure the receiver's hardware for Serial or IEEE-488 operation, it is only necessary to change a small plug-in daughter board in the Digital Module, and the rear panel mounted bus plate with its associated cable. The control firmware detects the interface type at power up and then operates it. Refer to Chapter 2 for installation and electrical characteristics.

Parameters associated with the remote control interface can be checked and changed from the front panel of the receiver. For the IEEE-488 interface the only parameter that may be set is the receiver's talk and listen address. For the serial interface, the bus address, bus type (RS-232 or RS-422), baud rate, bus sharing option, and line parameters may be set. (Line parameters include number of data bits, number of stop bits and parity options).

NOTE

For remote control operation using the RCU-3100 remote control unit, refer to the RCU-3100 Technical Manual.

Each type of interface is described below.

3-8.1 Serial Bus Description. The serial interface includes both unbalanced (RS-232) and balanced (RS-422) line interfaces. The control firmware is designed to detect the interface type (serial, IEEE-488, or none) at power up. However, it does not detect the type of serial bus. This must be selected by the operator (refer to paragraph 3-7.5.2.2.1).

3-8.2 Serial Bus Message Format. All transmissions, in either direction, conform to the message format shown in figure 3-9. All transmitted and received characters will be encoded and interpreted as conforming to the ASCII character code except for the reply to the TB? (Pan Data Block Request) message. Refer to the description of the TB? message in table 3-5 for details.

Each character in the message is passed in an asynchronous serial format as shown in figure 3-10. The number of data bits, number of stop bits, parity options and baud rate are all selectable from the front panel of the receiver through the keypad. These selections are stored in nonvolatile memory. All characters are in ASCII code.

3-8.3 Serial Bus Message Types. All messages are divided into two major categories: command messages and status messages. Each category is discussed in the following paragraphs:

3-8 REMOTE OPERATION USING SERIAL BUS.

The receiver may be optionally operated under remote control using a serial bus and a suitable controller. To operate in this manner, press the LOC/REM key until CTRL:REMOTE appears on the display. The LOC/REM key has positive control over the remote control function. However, the bus controller may allow control or prevent local control when the receiver is in the REMOTE mode.

Ensure that the communications parameters are set in accordance with the system requirements. Refer to Chapter 2 for the correct installation procedures. The bus address, bus type (RS-232 or RS-422), baud rate, number of data bits, type of parity used, and number of stop bits must match the requirements of the system controller. Refer to paragraph 3-7.5.2.2.1 to configure the remote control line parameters for the serial bus.

3-8.3.1 Serial Bus Command Messages. Command messages are sent from the controller to the receiver and are subdivided into two classes as follows:

3-8.3.1.1 Serial Bus Radio Command Messages. Radio command messages contain commands that are passed to the receiver. They may command the receiver to change operational parameters or to report back operational status.

3-8.3.1.2 Serial Bus Interface Command Messages. Interface command messages contain commands that are acted upon by the communications interface in the receiver. These commands cause the interface to change modes or report status.

3-8.3.2 Serial Bus Status Messages. Status messages are sent from the receiver to the controller and are subdivided into two classes as follows:

3-8.3.2.1 Serial Bus Radio Status Messages. Radio status messages contain information about the operational status of the receiver. These messages are sent as a reply to radio command messages that request a status report.

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|STX|1 2 3|F 2 3 9 8 7 6 0 0 0 SP M C|CR| | | | / | | |---|-Adr-|--------Data Field-/------|--| / / \ Start ASCII Carriage of Text Space Character Return

NOTES:

The first character of a transmission will always be STX (start of text, ASCII code 02).

The second, third, and fourth characters will contain the address in decimal, with the most significant digit first, of the receiver sending the transmission or to which it is being sent by the controller. The address code for any receiver may be any number from 000 to 254 provided that it is not used by any other unit connected to the bus. Address 255 is reserved for "broadcasting" to all receivers on the bus (refer to paragraph 3.8.6). The controller has no address. All three digits must be transmitted. Addresses less than 100 must be filled with '0' digits on the left. The address is set from the front panel with the soft key sequence CONFIG 6 REMOTE6 ADDRS.

The fifth character of the transmission is the beginning of the data field. This field may contain as few as one or as many as 250 characters. The data field may contain one or more messages. If more than one message is contained in the data field, each message must be separated from the next by one or more blank (space) characters.

Any number of messages may be included in the data field provided that the maximum number of characters is not exceeded. There are, however, certain request for status commands that may not be mixed with any other request for status commands in the same transmission. These messages will be noted as such in table 3-5.

The final character of the transmission will be a CR (carriage return). This character will follow the last character of the data field.

This transmission above from the controller is addressed to the receiver with address 123 and contains two messages: "F23987600" and "MC".

When sending messages to the receiver that require numeric values as arguments, it is not necessary to include leading zeros. For example, to send a message to change the frequency to 5.67 MHz, the command message "F5670000" may be given in place of "F05670000". When a request for a status message is made, the reply will always include any leading zeros so that the value may be extracted by counting characters in the message.

Figure 3-9 Serial Bus Message Format.

|ST|D1 D2 D3 D4 D5 D6 D7 (D8)|(P)|S (S)| | | | | | |--|--------Data Bits--------|---|-----| / / \ Start Parity Stop Bit Bit Bit(s)

NOTES: Information is passed in full duplex as characters in an asynchronous serial format. Each character consists of a start

bit, 7 or 8 data bits with the least significant bit sent first, an optional parity bit which may provide odd or even parity, and one or two stop bits. The serial transmission rate may be set to each of the following standard rates: 75, 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, and 125000 bits per second. Number of data bits, number of stop bits, parity options and baud rate are all selectable from the front panel of the receiver through the keypad from the CONFIG 6 REMOTE menu. The selected values take effect immediately when changed and are stored in non-volatile memory.

Figure 3-10 Serial Bus Character Format.

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3-8.3.2.2 Serial Bus Interface Status Messages. Interface status messages contain error status information caused by a previous command message or other source. When the receiver is in the acknowledge mode, it will respond to all command messages (except X and V) with an interface status message unless the command explicitly requested a status message.

3-8.4 Serial Bus Message Protocol. The interface system operates in one of three modes: normal, acknowledge, or independent. These modes are selected by sending the receiver the appropriate interface command message. Each of the three modes are discussed in the following paragraphs:

3-8.4.1 Serial Bus Normal Mode. In Normal Mode the receiver unit will process messages that are addressed to it but no response will be sent back unless the Command Message was a request for Status Message (Radio or Interface). The controller can verify that its Command Message(s) was received without error by sending a Command Message requesting a reply Status Message either immediately after sending the original Command Message, or after having sent Command Messages to other receiver units. This mode allows the fastest throughput of commands to a large group of receivers because the controller does not have to wait for each receiver unit to process the message(s) before moving on to the next receiver unit.

message (R?) to be sent, and Independent Mode 3 which causes a signal strength report (SS?) to be sent. These modes can be used to keep a printed record of signals detected during sweep or scan operation.

3-8.5 Line Driver Operation. When Bus Sharing is enabled through the receiver's front panel, that receiver's Transmitted Data and Request to Send line drivers are maintained in a high impedance state at all times except when it is required for that unit to transmit. In Normal Mode operation, this only occurs when the unit has received a Command Message that requests a reply Status Message. In Acknowledge Mode, all commands will caused the addressed unit to transmit.

The line drivers will be turned on and placed into the mark state for at least one full character time before the first character (the STX) is transmitted.

3-8.6 Broadcast Address. All receivers equipped with the serial interface will respond to address 255 the same as its actual configured address. This is referred to as the broadcast address. If a single transmission is sent to this address, each receiver on the bus will respond to the commands in the transmission as if they were sent to it individually. This feature may be used to cause a group of receivers to act in unison, or to reduce the time it takes to initialize a group of receivers to a set of common parameters.

3-8.4.2 Serial Bus Acknowledge Mode. In Acknowledge Mode a receiver unit will always respond to Command Messages with a Status Message after it has processed the Command Message (except for the X and V commands). If the Command Message was for a reply Radio Status Message, and no errors or faults have been detected, the reply will be the requested Status Message. In all other cases, the receiver unit will respond with an Interface Status Message. This mode reduces maximum throughput because the controller must wait for the reply Status Message before issuing another command, but it simplifies the controller's job when it wants to verify the reception of its Command Messages and maximum throughput is not needed.

3-8.4.3 Serial Bus Independent Mode. In Independent Mode the receiver will send a specific Status Message whenever a squelch break occurs. This will occur independently of any Command Messages. Independent Mode is intended to be used only in non-controller systems with a terminal or printer unless the controller implements a method of handling contention. Three sub modes are available: Independent Mode 1 which causes a frequency and channel number report (F? and CN?) to be sent, Independent Mode 2 which causes a complete status

The broadcast address must not be used to request status from a group of receivers or when the receivers are operating in the acknowledge mode, since this would cause bus contention as all receivers would reply at the same time. With only one receiver on the bus it is possible for the controller to determine the unit's address by sending a status request to the broadcast address and examining the address field in the reply, since the reply message contains the unit's configured address. This can be used during system integration as a troubleshooting aid.

3-8.7 Serial Bus Message Definition. All messages are ASCII encoded and inserted into the data field of transmissions as defined in paragraph 3-8.2. Messages from the controller may use lower or upper case for all alphabetic characters. The receiver always uses upper case.

Each message that can be sent using the bus controller is listed in the following tables:

o Table 3-3. Serial Bus Interface Command Messages. o Table 3-4. Serial Bus Interface Status Messages. o Table 3-5. Radio Command and Status Messages

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Most Radio Status Messages use the same format as the Radio Command Message for that parameter (except for the X? command.). For example, the reply to the Radio Command Message "L?" (current Squelch setting) is "L123" in the same format as the Radio Command Message to change the Squelch.

All Radio Status Messages (except the reply to the TB? command) are made up of fixed length strings so that values may be parsed by counting the characters of the Status Message. Messages which return a numeric value will be padded with zeros on the left to give the same number of characters as the same message with the maximum value. When more than one parameter is being reported, the individual parameters are separated by a blank (space) character.

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Table 3-3 Serial Bus Interface Command Messages.

Message Definition

:NORM Set NORMAL interface mode :ACKN Set ACKNOWLEDGE interface mode :IND1 Set INDEPENDENT mode 1 :IND2 Set INDEPENDENT mode 2 :IND3 Set INDEPENDENT mode 3 :? Request Interface Status Message

Table 3-4 Serial Bus Interface Status Messages.

Message Definition

OK:NORM No errors, NORMAL Mode OK:ACKN No errors, ACKNOWLEDGE Mode OK:IND1 No errors, INDEPENDENT Mode 1 OK:IND2 No errors, INDEPENDENT Mode 2 OK:IND3 No errors, INDEPENDENT Mode 3 TE:EEPR Testing error - EEPROM corrupted TE:POST Testing error - power on self test error LE:PRTY Line error - parity LE:FRMG Line error - framing LE:OVRN Line error - overrun IE:OVFL Interface error - buffer overflow IE:IVAL Interface error - illegal value IE:UNKN Interface error - unrecognized message RE:FALT Radio error - fault has been detected

3-50 Issue 2.2

Table 3-5 Radio Command and Status Messages.

Courtesy of http://BlackRadios.terryo.org

Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

A? AK?

AKn

Continue operation from a wait condition caused by power on self test (POST) failure. This is the remote control equivalent of "press any key to continue".

Enable or disable Automatic Gain Control (AGC) operation. Replace the * with 1 to enable AGC operation or 0 to disable AGC operation. When AGC operation is disabled, the current Manual Gain setting is in effect.

Request current status of AGC (on or off). AGC attack time report requests the current AGC attack time used with

the fast attack, slow decay AGC used in all modes except AM. The reply format is the same as for the AGC attack time command above. This command is only available over the remote control bus.

AGC attack time command, sets the AGC attack time used with the fast attack, slow decay AGC (all modes except AM). The character 'n' is replaced with a digit between 1 and 9. The value 9 gives the original 'normal' attack time, with smaller values reducing the attack time proportionately. The AGC attack time is not stored in non-volatile memory. When power is first applied the the unit, the AGC attack time is set to the normal value, AK9. This command is only available over the remote control bus.

(AGC on/off) is expanded to add the Gain Hold feature. The argument 'n' is one of the following values:

B±1234

B? BI

0 MGC operation, as before 1 AGC operation, as before 2 Reserved 3 Gain Hold mode. Current gain setting is 'frozen'. This mode is not available when ISB operation is selected and is only available over the remote control bus.

Change BFO offset. The ± character represents the sign of the desired value, and is replaced with either - or +. The digits 1 through 4 represent the value of the offset in Hertz with the character 1 representing the 1 kilohertz digit and the 4 representing the Hertz digit. The BFO setting is only used when the mode is CW. Any changes to the BFO when the mode is not CW will result in an Unrecognized Command error. (Range: 6000 to +6000 Hz).

Request current BFO setting. Perform the built-in-test-equipment (BITE) test sequence. This command

may take several seconds to complete. To see the results of the BITE test, send the BI? command.

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

BI?

BInnnnnnnnnn

BIte Status: Each of the n characters represents one of the tests performed when the BITE sequence is performed and is replaced with a 1 to indicate that the test failed or a 0 to indicate that the test passed. Starting with the first (left most) n character, the definition of each test bit is as follows:

1. Test freq: 0.375 MHz, USB, normal channel

2. Test freq: 1.125 MHz, LSB, alternate channel

3. Test freq: 2.625 MHz, USB, normal channel

4. Test freq: 2.225 MHz, LSB, alternate channel

5. Test freq: 3.750 MHz, USB, normal channel

6. Test freq: 5.250 MHz, LSB, alternate channel

7. Test freq: 8.250 MHz, USB, normal channel

8. Test freq: 11.250 MHz, LSB, alternate channel

9. Test freq: 17.250 MHz, USB, normal channel

10. Test freq: 27.750 MHz, LSB, alternate channel

BT#

BT? C?

CFxx

BSn

MDn

PSn

Change Bridge Time. # represents a one character number to select the bridge time in seconds between signals when the receiver has stopped on a signal during scan or sweep operations. (Range: 0 through 9)

Request current Bridge Time. Request report of all parameters that are now different from those

reported in the last Radio Status Message for each parameter. Set selected configuration parameter into non-volatile memory. Replace

the xx with one of the following choices:

Enable or disable bus sharing. Replace the n with 1 to enable or 0 to disable bus sharing.

Enable or disable mode defaults. Replace the n with 1 to enable or 0 to disable mode defaults.

Receiver operates in Manual Gain control (MGC).

Protects the operator from excess audio should a signal exceed the gain threshold. The receiver has a fixed gain below the operator's selectable signal level and automatic gain control (AGC) above the threshold level.

Enable or disable the saving/restoring of the front panel parameters when power is removed/applied. Replace the n with a 1 to enable saving or a 0 to disable saving the parameters.

SRnnnn

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Set the SSB low frequency roll off corner frequency. Replace the nnnn with a 1 to 4 digit decimal number giving the desired roll off in hertz. (Range: 0 - 1000 Hz).

CLear all 250 memory channels to default parameters.

Table 3-5 Radio Command and Status Messages.

Courtesy of http://BlackRadios.terryo.org

Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

CN? CN123 or CN---

CO CRnnn?

D? DP123

F12345678 M* W1234 L123 A* Y123 G123 B±1234 I±1234 SK* P12345678 D9 BT9

Request the current channel number: The characters 123 represent the three digits of the current channel number. If the radio parameters have been changed since the last channel was recalled the reply message will take the second form with dashes in place of the digits.

Continue a stopped Scan or Sweep operation. Request Channel Parameters: The actual reply will be a single string of

characters. The reply is shown on multiple lines here only for readability. The fields of this message are as described for each reply individually. Fields are separated by a single space.

Clear all Skip frequencies stored in the skip table used during sweep operation.

Change Dwell Time. # represents a one character number to select the dwell time in seconds after signal detection during scan or sweep operations. (Range: 0 through 9)

Request current Dwell Time. Dump/Preset the current AGC value to the gain reduction value indicated

by digits 123. Refer to G123 command for gain reduction settings. When this command is sent, the receiver gain reduction is immediately set to this value.

(cont)

Used in conjunction with FAQ# command. To allow fastest possible operation in the remote mode, this command should be sent to the receiver directly following the Recall Channel (RC) command. DP000 is automatically set when the receiver uses its internal sweep and scan functions. If DP is sent without following digits, DP000 is assumed.

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

EEPCLR

Clear the entire contents of the receiver's non-volatile memory. All user selected configuration items will be set to the original factory values. These values are:

All 250 memory channels to default parameters. Front panel parameters stored at power down to default parameters Clear all frequencies from sweep skip table Soft key assignments for bandwidth and AGC Mode defaults enabled Mode defaults reset to original values Front panel Local/Remote selection to Remote

!Receiver bus address to 000 !Bus type to RS-232 (serial only) !Baud rate to 19,200 bps (serial only) !Line Parameters to 8 bits, no parity, 1 stop bit (serial only) !Bus sharing On (serial only)

SSB Roll off to 400 Hz Saving of parameters on power down disabled Display intensity to 100% Keypad clicks and beeps enabled Soft key menus shown by default Reference mode to Automatic

NOTE: Execute this command with extreme caution! When the receiver changes to the default interface parameters listed above with dots (!), the remote controller will need to change to these values also unless they are already set. Never use this command when more than one receiver is connected to the bus as they will all be set to address 000. Receiver local operation may also be affected by this command.

F12345678

(cont)

3-54 Issue 2.2

Change receiver operating Frequency. Digits 1 through 8 represent the eight digits of the receiver operating frequency with 1 representing the most significant (10 MHz digit) and 8 representing the least significant (1 Hz). (Range: 0 to 30 MHz or F00000000 through F30000000)

Request current frequency.

Table 3-5 Radio Command and Status Messages.

Courtesy of http://BlackRadios.terryo.org

Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

FA?1 FAnnnnnnnnnnnnnnn

(cont)

Request the Faults, Accumulated: The 16 n characters indicate the accumulated status of the fault conditions with each n replaced with a 1 to indicate the fault is true or a 0 to indicate that the fault is not true. Starting with the first (left most) n character, the definition of each fault bit is as follows:

1. Software error interrupt has occurred

2. Fault detected in RF Analog Module

3. Fault detected in Synthesizer output or fine loop

4. Fault detected in Synthesizer step loop

5. Fault detected in Power Supply Module

6. DSP processor not responding to requests

7. EEPROM does not accept programming

8. Serial bus time-out Fault (check CTS if bus sharing is disabled)

9. GPIB timeout: ready to talk but not addressed

10. GPIB timeout: got talk address but no handshake

11. Serial bus UART detected overrun error

12. Serial bus UART detected parity error

13. Serial bus UART detected framing error

14. Illegal bus address for bus type

15. Not currently used

16. Not currently used

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

FAQ#

Turn Fast Acquisition mode on/off. # represents a one character number to turn the Fast Acquisition mode on or off. Where 0 = off, and 1 = on. The fast acquisition mode permits cycling between stored channels within the memory of the receiver using the remote bus to step channels. The facility makes use of the standard recall facilities within the receiver, but enables them to be done faster than otherwise possible. The speed is made possible by preventing certain display operations during recall. The display reverts to a “Fast Acquisition” display using minimum graphics when in remote. Only the channel and frequency are updated to the display with a special fast format.

When enabled, the receiver will not accept commands to change operating mode, bandwidth, AGC on/off, AGC decay, or MGC setting. Sweep and scan modes may not be entered. If any of these commands are sent, a command not allowed fault will be generated.

RELEVANT COMMANDS

FAQ0 or K - Turn off fast acquisition mode FAQ1 - Turn on fast acquisition mode RCnnn - Recall stored parameters in channel number nnn.

(Leading zeros may be omitted)

DP - AGC Dump

Notes On Usage

1. The receiver must be set to REMOTE using the LOC/REM key on the front panel.

2. The command FAQ1 is sent to turn on the fast acquisition mode. The change in display format will be noted when FAQ1 is sent.

3. RCnnn will recall any settings previously stored in channel nnn and automatically commence recalling within 2 msec of receipt of the RCnnn command. Faster operation is available when the modulation and filter associated with the recalled channel is the same as the previous channel.

4. Subsequent recalls to RC2, RC10, RC6, etc., can be made in any order.

5. Enabling/disabling local mode using the front panel LOC/REM key turns on/off the special display.

6. The command FAQ0 or K exits fast acquisition and returns the display to normal.

7. Frequency offset and audio output level are not updated.

8. Output may be noisy or distorted.

Example Sequence

FAQ1 RC1 DP RC2 DP RC10 DP

etc. etc.

3-56 Issue 2.2

Table 3-5 Radio Command and Status Messages.

Courtesy of http://BlackRadios.terryo.org

Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

FAQ? FAQ#

FC?

FCnnnnnnnnnnnnnnn n

FS?

FS*

FSK? FSK0

FSK1

FSffffffff, ddd

G123

Request current Fast Acquisition mode. FAQ1=on, FAQ0=off

Request Faults, Current: Indicates current fault status (Refer to FA? above).

Request Fault Status: The character * will be replaced with a 0 if no faults are currently detected, or by 1 if one or more faults are currently detected. For detailed status of current and accumulated faults use the FC? and FA? commands.

Positive: Normal Data Sense Negative: Inverted Data Sense

Special Frequency command, sets the operating frequency to the value ffffffff. The current AGC value is dumped to the preset value ddd. When this command is executed, the display is not updated, and will continue to show the previous settings. Units and limits for the two parameters are the same as for the F12345678 and the DP123 commands. Note: the dump parameter is given in units of dB, not 1/2 dB as other commands use. Leading zeros may be omitted from each argument field to reduce communication time.

Change Manual Gain. Digits 1 through 3 represent the significant figures of the IF gain reduction from full gain. This number is in units of 1/2 dB and is implicitly negative. To convert the desired actual manual gain reduction in dB, multiply it by 2. For example, to set a gain of -123.5 dB, send G247. (Range: 0 through 255 corresponding to 0 to 127.5 dB).

G? H? Hsnn

Hsnn

ID?

IDD?

(---------------)

Request current Manual Gain setting. Gain Hold adjustment report, requests the current Gain Hold setting. The

reply is in the same format as the Gain Hold command. This command is only available over the remote control bus.

Gain hold adjustment. The 's' is replaced with the '+' or '-' sign and the 'nn' is replaced with the amount of offset to be applied to the gain in Gain Hold mode in 1/2 dB units. Range -24 to +24 (+/- 12 dB). When the command is repeated, the value used is the offset from the original gain value set when the A3 command was first sent. This command is only available over the remote control bus.

Identify: The reply to this command is a message that identifies the manufacturer, the equipment name, the firmware version number and date, and a copyright notice. This message is less than 125 characters in length.

Identify DSP: The reply to this command is a message the gives the date and version number of the firmware in the DSP processor. This message is less than 80 characters in length.

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

I±1234

I? K

L123

Change IF Shift setting. The ± character represents the sign of the desired value, and is replaced with either - or +. The digits 1 through 4 represent the value of the IF Shift in Hertz with the character 1 representing the 1 kilohertz digit and the 4 representing the Hertz digit. The IF Shift setting is only used when the mode is CW. Any changes to the IF Shift when the mode is not CW will result in an Unrecognized Command error. (Range: -6000 to +6000 Hz).

Request current IF Shift setting. Cancel. Stops sweep or scan operation and clears all sweep and scan

parameters. Change the Squelch Level. Digits 1 through 3 represent the significant

figures of the signal level that must be present to open the squelch or to stop a sweep or scan. This number is in units of 1/2 dB and is implicitly negative. To convert the desired actual squelch level in dBm, multiply it by 2. For example, to set a squelch level of -103.5 dBm, send L207. Changes made with this command are affected by the current ISB Access Mode. (Range: 0 through 231 representing 0 through -115.5 dBm).

Request current Squelch Level setting.

Change receiver operating Mode. * represents a one character code chosen from the following set: L for LSB, U for USB, I for ISB, C for CW, A for AM, and F for FM. When the mode is changed, some of the other receiver parameters are set to new values as defaults. If these other parameters are also being changed, set the new mode first before changing the other parameters. In addition, CDR-3200 models that include an FSK detector module will respond to the following mode codes: V for very narrow shift FSK, N for narrow shift FSK, M for medium shift FSK, and W for wide shift FSK.

M? MSGnnmmm

NBIF? NBIFsnnn

3-58 Issue 2.2

Request current mode. Display message command, clears the display and writes an optional

message in the display. The characters 'nn' are replaced with the count of characters in the optional message. Both digits are required. The characters 'mmm' are replaced with the message characters to display. If blanking only is desired (no message) the command 'MSG00' should be sent. The maximum message length is 31 characters. When counting characters, all characters including spaces must be counted. This command is only available over the remote control bus.

NBIF frequency, requests the current NBIF frequency setting. The reply syntax is the same as for the NBIF frequency setting command.

Table 3-5 Radio Command and Status Messages.

Courtesy of http://BlackRadios.terryo.org

Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

NBIFsnnn

O±12

O? P12345678

Narrow Band IF output frequency setting allows adjustment of the NBIF output center frequency over a limited range of frequencies, depending on the hardware option installed. The 's' character is replaced with a '+' character to select a normal non-inverted output spectrum, or a '-' to select an inverted output spectrum. The 'nnn' characters are replaced with the desired frequency in kilohertz. For units with the bandpass filter output circuit the frequency range is 450-460. For units with the low pass filter output, the frequency range is 8-30. This command is available from the front panel as well as the remote control bus. The front panel key sequence is CONFIG->NEXT->NBIF. The NBIF frequency is saved in non-volatile memory and only needs to be set once unless the EEPROM memory is cleared. When this occurs, the value is set to +455 kHz. (In units with the low pass filter output circuit, this will produce an output centered at 20 kHz, inverted.)

Change the threshold Offset used in scan or sweep operation to adjust the squelch level setting for all channels. The ± character represents the sign of the offset (+ or -), 1 represents the 10s of dB, and 2 represents the units of dB. (Range: -30 through +30)

Request the current threshold Offset. Change SteP Size. 12345678 represent the step size during sweep

operation as a frequency increment with 1 Hz resolution. The 1 represents the 10 MHz units and the 8 represents the 1 Hz units. (Range: 1 Hz through 10 MHz)

P? PO?

Request current SteP Size.

POnnnnnnnn

Request most recent POST results: Each of the n characters represents one of the tests performed when the POST sequence is run and is replaced with a 1 to indicate that the test failed or a 0 to indicate that the test passed. Starting with the first (left most) n character, the definition of each test bit is as follows:

1. Controller program ROM sum check failed

2. RAM test failed

3. EEPROM CRC test failed

4. DSP processor failed ROM test

5. DSP processor failed external RAM test

6. DSP processor failed internal RAM test

7. DSP processor failed FIFO/DIRECT test

8. BITE test failed

V* F12345678 M* W1234 L123 A* Y123 G123 B±1234 I±1234 SK*

Request receiver operating parameter status: The actual reply will be a single string of characters. The reply is shown on multiple lines here only for readability. The fields of this message are separated by a space and are described for each reply individually.

P12345678 D9 BT9 O-20 CN123 FS* SNxy SR1234 X12

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

RC###

RSccc,ffff ffff,ddd

S*?

SA? SA±123

ReCall operating parameters from memory channel. ### represents the three digits of the memory channel from which to recall the parameters. Recalled data is entered immediately. This command is also used to set the starting channel for a scan or sweep operation in which case it is followed by a Scan or Sweep command. (Range: 0 through 249)

Special Recall command, performs a recall of the channel number specified by the number ccc. In addition, the frequency from the recalled channel is ignored, and the frequency is set to the value ffffffff. The current AGC value is dumped to the preset value ddd. When this command is executed, the display is not updated, and will continue to show the previous settings. Units and limits for the three parameters are the same as for the RC###, F12345678, and DP123 commands. Note: the dump parameter is given in units of dB, not 1/2 dB as other commands use. Leading zeros may be omitted from each argument field to reduce communication time.

Request receiver meter reading. Replace the * with an S to request signal strength, an A to request audio output level, and an F to request frequency error. The value returned will be for the currently selected ISB

Access Mode. Frequency error may only be requested when receiver operating mode is not ISB.

Request audio output level: The ± character represents the sign of the value and will be either + or -. Digits 1 through 3 represent the significant digits of the audio output level in dB below one milliwatt in units of 1/10 dBm. The 1 represents the 10s of dB, the 2 represents the 1s of dB, and 3 represents the 1/10s of dB (Range: -50.1 through +12).

SC###

SF? SF±12345

SG? SGbbbbbbbb

Begin SCan of memory channels. ### represents the three digits of the highest memory channel to be scanned. The scan begins at the memory channel most recently recalled with the RC### command. (Range: 0 through 249)

Request frequency tuning error: The ± character represents the sign of the value and will be either + or -. Digits 1 through 5 represent the significant digits of the frequency error in Hertz where 1 represents the 10 kHz digit and 5 represents the 1 Hz digit. (Range: bandwidth dependent).

Request status of last GPIB Service Request: Each b character is replaced with a 0 to indicate that the corresponding bit was not the reason for the last SRQ, or a 1 to indicate that the corresponding bit was responsible for the last SRQ. See figure 3-11 for Serial Poll response byte bit positions.

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Table 3-5 Radio Command and Status Messages.

Courtesy of http://BlackRadios.terryo.org

Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

SK*

SK?

SMbbbbbbbb

Controls the receiver Skip parameter. The * is replaced with a 1 to set or enable the skip function, and a 0 to clear the skip function. The actual action depends on the current state of the receiver. If not scanning or sweeping, SK1 sets the skip flag in the current operating parameters and SK0 clears the skip flag in the current operating parameters.

If the SK1 command is followed by a store operation, that channel will be skipped in any subsequent scan or sweep operation. If the command SK1 is given during scan operation and the receiver is dwelling or bridging on a channel, the skip flag is automatically stored in that channel and the scan proceeds to the next channel.

If the command SK1 is given during sweep operation and the receiver is dwelling or bridging on a frequency, that frequency is stored in a table of sweep skip frequencies and it will be skipped in any further sweep operations. The command SK0 has no effect if the receiver is sweeping or scanning.

Request current Skip Flag status.

Set the SRQ mask byte (IEEE-488 interface only). Controls the generation of the SRQ message for each of the conditions in the Serial Poll response byte. Each b represents one bit in the Serial Poll. See paragraph 3-9.4 for a description of the Serial Poll response byte. For each b character that is replaced with a 1, that bit will allowed to generate an SRQ. Bits replaced with a 0 will not be allowed to generate an SRQ. The default condition at power on is to allow all bits to generate SRQ.

SN? SNxy

SP SR####

SR?

Issue 2.2 3-61

Request Scan/Sweep Status: The character x will be replaced with one of the following:

C when the receiver is currently scanning (even if stopped) W when the receiver is currently sweeping (even if stopped) N when the receiver is not scanning or sweeping

The character y will be replaced with one of the following:

D when the scan or sweep is dwelling B when the scan or sweep is bridging S when the scan or sweep is stopped N when the scan is not dwelling, bridging, or stopped

StoP the Scan or Sweep operation in progress but save parameters. Set the step rate for sweep and scan operations to #### milliseconds

per step. Legal values range from 10 to 5000. Request the current Step Rate.

CDR-3250/80 TECHNICAL MANUAL

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

SS? SS±123

ST###

SW###

(cont)

Request signal strength: The ± character represents the sign of the value and will be either + or -. Digits 1 through 3 represent the significant digits of the signal strength in dB relative to one milliwatt where:

1 represents 100 dB, 2 represents 10 dB, and 3 represents unit dB increments. (Range: -116 through +012).

STore current operating parameters into memory channel. ### represents the three digits of the memory channel being stored to.

Begin SWeep of frequency bands. ### represents the three digits of the highest odd numbered memory channel from which to take the sweep stop frequency. The sweep starts at the frequency of the channel most recently recalled with the RC### command. (Range: 0 through 249)

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Table 3-5 Radio Command and Status Messages.

Courtesy of http://BlackRadios.terryo.org

Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

Set the Special Step Mode. This command is used to change the operation of the receiver when sweeping. The receiver outputs signal strength data characterizing the sweep. The manner in which the operation is changed depends on the character that replaces the # as follows:

NOTE: This mode is not accessible from the front panel menus.

0 Cancel Special Step Mode. Sweep returns to normal operation. This is

the default condition at power up.

1 Reserved.

2 Set Pan Sweep "one-sweep" data collection mode. In this mode the

sweep function is modified to collect signal strength data from the frequencies setup in the sweep. The receiver does not stop when signals are detected above the squelch threshold. At the end of one sweep the receiver stops sweeping and a block of signal strength data is made available at the remote control interface. The TB? command will then cause the receiver to send this data block to the remote controller.

3 Set Pan Sweep "free run" data collection mode. This mode is the same

as the one-sweep mode (T2) except that the receiver does not stop sweeping when one sweep has been completed. The receiver continues to sweep and each new sweep's data replaces the previous sweep data in the output queue. When requesting a data block in this mode the receiver always responds with the most recent sweep data.

4 Set Pan Sweep "buffered" data collection mode. This mode is the same

as the free run mode (T3) except that the output queue keeps up to 5 blocks of sweep data available for sending to the controller. When a request command (TB?) is sent by the controller, the receiver will transmit the oldest data block that has not already been sent. If more than 5 sweeps have been completed before the queue has been read by the controller, the oldest data blocks are overwritten. In this way the 5 most recent unread blocks are always maintained. The block sequence number that is part of the returned data block message may be used to detect queue overrun.

NOTE: Due to buffer size and sweep time considerations, the number of frequencies that will be allowed with the sweep command (SW###) when any of the Pan Sweep modes is in effect is limited. If this limit is exceeded, the receiver will respond to the SW### command with IE:IVAL.

Issue 2.2 3-63

Request the current Special Step Mode setting.

CDR-3250/80 TECHNICAL MANUAL

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

TB?

(Refer to description)

Request the Block signal strength: The reply to this command is a specially formatted block of data created by the receiver when sweeping in one of the Pan Sweep data collection modes (T2, T3, and T4). If Special Step Mode T4 is set, and more than one block of data is available in the output queue, a separate TB? command must be sent for each one.

This reply message contains 8 bit non-ASCII data so serial interface units must have their line parameters set for 8 data bits. Following the normal ASCII STX, three character ASCII address, and the message type header TB, are a variable number of 8 bit bytes that give the sweep number, the data byte count, and the data bytes themselves. This data format is illustrated below:

The two bytes following the TB message header are the block sequence number. This is a 16 bit value with the high byte sent first and is assigned by the receiver when the block of sweep data is assembled. This number can be used to verify that data blocks are not being created faster than they are being read by the controller.

The first block after beginning a sweep will be number zero. If more than 65,535 sweeps have been taken since the sweep was begun, this number starts again from zero. The next two bytes give the number of data bytes that follow. This is a 16 bit value with the high byte sent first.

Following the byte count are the actual data bytes. The first data byte represents the signal strength of the first frequency visited in the sweep, the second data byte represents the second frequency visited in the sweep, and so forth for each frequency in the sweep. Frequencies that are stored in the sweep skip table are not visited in the sweep and will not have associated data bytes.

This means that the number of data bytes in the reply message may be less that the number calculated based on the start frequency, the stop frequency, and the step size. (Send the CL command to prevent this).

Each data byte is a signed two's complement number that represents the signal strength of the energy present on the visited frequency in dBm. The range is approximately -115 to +12 dBm.

Following the last data byte is an ASCII CR (carriage return) character. This is the last character of the reply message and is included for consistency with the other messages. It should not be confused with a data byte.

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Table 3-5 Radio Command and Status Messages.

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Syntax Reply Description

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TG? TGnnn

Total Gain Reduction report, requests the amount of total gain reduction currently in effect. The reply is in the format 'TGnnn' with the characters nnn replaced with the actual total gain reduction in units of 1/2 dB. This command is only available over the remote control bus.

Select the ISB Access Mode. The * is replaced with the letter N to select access to the normal channel (USB) parameters or with the letter A to select access to the alternate channel (LSB) parameters. ISB Access Mode affects the following commands:

Y, Y? (AGC Decay) L, L? (Squelch Level).

There are two different parameter values for each of these commands (for the two channels of ISB, Normal and Alternate). The current setting of the ISB Access Mode determines which channel is affected (or reported on) by the respective radio command or status request. The default ISB access mode is N (normal channel). This setting applies until the V command is sent for the first time after power up. This command is not affected by the setting of the X (local/remote) command.

The ISB Access Mode command also affects the reply to the following status request commands:

(cont)

SS? (Signal Strength report) SA? (Audio Level report)

NOTE: For all modes except ISB, the receiver takes its parameters from the Normal channel so when changes are desired to affect the above parameters when the mode is other than ISB (including LSB), the ISB Access Mode should be set to N (normal). For example, if the current operating mode is LSB and the ISB Access Mode is set to A (alternate),

sending the L (squelch level) command will have no affect on the current operation of the receiver. If the mode is subsequently changed to ISB, The previously set squelch level will be in effect for the alternate (LSB) output channel.

Request the current ISB access mode.

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Table 3-5 Radio Command and Status Messages.

Syntax Reply Description

Wnnnn

Change receiver IF bandwidth. nnnn is a two to four digit number that represents the IF bandwidth in units of 10 Hz. (e.g. for an IF bandwidth of 2700 Hz, nnnn is replaced with the digits 270). The selected bandwidth must be on the list of available bandwidths below. The range is limited under certain conditions. In ISB mode the bandwidth is fixed and need not be sent. For all other modes other than AM and FM, the maximum bandwidth is limited to 6 kHz.

The following is a list of bandwidths available in the CDR-3250 receiver (all bandwidths are in Hertz):

100 800 2100 3400 150 900 2200 3500 200 1000 2300 4000 250 1100 2400 5000 300 1200 2500 6000 350 1300 2600 7000 400 1400 2700 8000 450 1500 2800 9000 500 1600 2900 10000 550 1700 3000 12000 600 1800 3100 14000 650 1900 3200 16000 700 2000 3300

W? X*

X? Xab

Request current IF Bandwidth. Switch between local and remote control operation (serial interface only).

The * is replaced with the character 0 to enable the receiver front panel and disable all remote change parameter commands (except this command and the V* command), or the character 1 to enable all remote control commands and disable all front panel keypad input (except the LOC/REM key). The receiver front panel may always override the remote controller by pressing the LOC/REM key until the display shows LOCAL). The power on default state is X1.

Request remote control status (serial interface only): The letter a is replaced with a 1 to signify that remote control is enabled from the remote controller or a 0 to signify that remote control has been disabled from the remote controller, and the letter b is replaced by a 1 to indicate that remote control operation has been selected from the receiver front panel or a 0 to signify that remote control operation has been disabled from the receiver front panel. For the receiver to respond to change parameter commands from the remote controller, both the remote controller and the front panel selections must be enabled (receiver replies X11 to X?).

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Table 3-5 Radio Command and Status Messages.

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Syntax Reply Description

CDR-3250/80 TECHNICAL MANUAL

Y123

NOTES:

Status request commands marked with this note may not be mixed with any other status requests in a single

transmission.

Change receiver AGC decay time. Digits 1 through 3 represent the significant digits of the AGC decay time in units of 10 ms. With the 1 representing the units of seconds digit, 2 the 100s of milliseconds, and the 3 the 10s of milliseconds. Values must be taken from the following list: 0, 1, 2, 3, 4, 6, 8, 10, 20, 30, 40, 60, 80, 100, 200, 300, 400 and represent decay times ranging from 0.00 to 4.00 seconds. For example, to set the AGC decay time to 0.6 seconds, the command Y60 would be sent. The AGC Decay setting has no effect in the AM and FM modes. Changes made with this command are affected by the current ISB Access Mode.

Request current AGC Decay Time.

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3-9 REMOTE OPERATION USING

IEEE-488 BUS.

The receiver can be operated under remote control, using an IEEE-488 bus, if the optional IEEE-488 Remote Interface board and bus plate are installed. Select the remote mode by pressing the front panel REM/LOC switch until CTRL:REMOTE appears in the display. When REMOTE is selected, the bus controller determines whether the receiver is in the remote or local mode.

NOTE

The bus controller can command the receiver to enter the local mode. When the controller commands the receiver to enter the local mode, the front panel will display CTRL:LOCAL.

3-9.1 IEEE-488 Bus Description. The IEEE-488 bus uses a party-line bus structure consisting of 16 signal lines. (Refer to table 3-6.) Devices are connected in parallel to the bus and information is passed in a byte serial/bit parallel fashion. Refer to IEEE Std 488-1978 for a complete description of the IEEE-488 bus.

The sixteen signal lines are divided into three major functional groups: bus management lines, handshake lines, and data lines. There are five bus management lines, three handshake lines, and eight data lines. Data and message transfer is asynchronous. Devices connected to the bus may be talkers, listeners, or controller. Multiple controllers may be connected to the bus but only one controller may be in charge at a time. The controller dictates the role of the other devices by setting the ATN (attention) line true and sending the talk or listen addresses on the data lines. While the ATN line is true, all devices must listen to the data lines. When the ATN line is false, only devices that have been addressed will actively send or receive data. All others ignore the data lines.

The eight bidirectional data lines (D1 - D8) transfer the data bytes on the bus. The bus management signals determine which device sends and which devices receive the byte. The handshake lines determine how long the byte remains on the bus.

One 24-pin, D-type ("Blue Ribbon") interface connector provides parallel connection for the receiver. A maximum of fifteen devices, including the bus controller, may be connected to the bus. (Each CDR-3250/80 chassis is counted as one device.) Each receiver must have a unique address set on the front panel.

The receiver may act as a talker and a listener. The SRQ function is selectable by means of a switch on the rear panel. If the SRQ function is disabled, the receiver can not request controller attention for communication. Two other switches on the rear panel are used to select the unaddressed talk only and listen only modes.

3-9.2 Device Capabilities. The interface capabilities implemented in the receiver are listed in table 3-8.

3-9.3 Talking and Listening. Commands sent to the receiver are prefixed with the appropriate Listen Address message and then the message is sent in ASCII as detailed in table 3-5. Following the transmission, " Unlisten" message may be sent or another transmission may be sent while the unit is still addressed. Each transmission must end with CR (carriage return) character. In addition, the EOI

(End or Identify) line must be set true concurrently with the CR. An example of the bus transaction necessary to

change the receive frequency to 12.345 MHz is as follows:

The unit's configured remote control address serves as both its Talk Address and its Listen Address, and may range from 0 to 30. Multiple receivers may be addressed as listeners and will all accept message transmissions simultaneously when so addressed.

Several listeners can be active simultaneously but only one talker can be active at a time. Whenever a talk address is put on the data lines (while the ATN is true), all other talkers will automatically be unaddressed.

The bus management lines conduct an orderly flow of information across the bus. The five bus management signals are defined in table 3-6.

The three handshake lines coordinate the transfer of data over the bus. Transfer is asynchronous and the transfer rate automatically adjusts to the speed of the source and acceptor. The transfer rate will be that of the slowest active device. The three handshake lines are defined in table 3-7.

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If the message sent to a receiver is a request for status (all messages that end with '?') the receiver will prepare a reply message and wait to be addressed as a talker. If the receiver does not receive its talk address within 5 seconds of the request for status, it will indicate a fault and stop waiting. If it receives the talk address within 5 seconds, it will perform the source handshake with the controller until all of the reply message has been sent. If the controller does not perform the acceptor handshake within 1 second of sending the talk address to the receiver, the receiver will time out, indicate a fault, and stop and return to normal operation. The receiver will assert the EOI line on the bus concurrently with sending the CR at the end of the status message. It is not recommended that request for status messages be sent to multiple receivers simultaneously.

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Table 3-6 IEEE-488 Bus Management Signals.

Name (Mnemonic) Description

Attention (ATN) Causes all devices to interpret data on the bus as a controller command. When ATN is

true, the bus is placed in the "Command Mode". All devices on the bus interpret data on the eight data lines as commands. When ATN is false, the bus is placed in the "Data

Mode". All active listeners on the bus interpret data on the eight data lines as data. Interface Clear (IFC) Clears the bus. Sets the bus to an idle state. Service Request (SRQ) Alerts the controller to a need for communication. Remote Enable (REN) Enables devices to respond to remote program control when addressed by the controller. End or Identify (EOI) Indicates last byte of multibyte sequence.

Table 3-7 IEEE-488 Bus Handshake Lines.

Name (Mnemonic) Description

Data Valid (DAV) Sent by source to indicate that data on the bus is valid. All active devices on the

bus can accept the byte as true information. Not Ready for Data (NRFD) Sent by acceptor to indicate that a device is not ready to accept data. Not Data Accepted (NDAC) Sent by acceptor to indicate that the data byte has not yet been read from the bus.

Table 3-8 IEEE-488 Implemented Interface Capabilities.

Mnemonic Description

SH1 Source Handshake, complete capability AH1 Acceptor Handshake, complete capability T6 Basic Talker, with serial poll and unaddress if MLA, no Talk Only mode TE0 No Extended Talker L4 Basic Listener, unaddress if MTA, no Listen Only mode LE0 No Extended Listener SR1 Service Request, complete capability RL2 Remote Local, no local lockout PP0 Parallel Poll, no capability DC1 Device Clear, complete capability DT0 Device Trigger, no capability C0 Controller, no capability E2 Three state line drivers

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3-9.4 SRQ and Serial Poll Response. The receiver will assert the Service Request uniline message (SRQ) when any of several conditions occur. The status of each of these conditions is given in the Serial Poll response byte. The conditions and their location in the Serial Poll response byte are shown in figure 3-11.

The Signal Present, Fault, and Local Control bits will generate an SRQ on the bus whenever that state changes, either from true to false or from false to true. Both Bad Message and Bad Value bits are cleared upon receipt of a valid command message.

When an SRQ message is received by the controller, each device on the bus should be Serial Polled to determine which device is requesting service. Bit 6, the SRQ bit will be sent as true by any device that is currently asserting the SRQ message. The controller may execute a Serial Poll with the receiver at any time to read its status.

It is possible for an SRQ to be generated and for the Serial Poll to show no change in status from previous polls. This can happen if the state of a bit has changed and then changed back before the poll is taken. For example, if a signal is detected and then goes away before the poll is read, the bit will still be read as false. This condition may be detected by sending the SG? status request. The reply to this status message is of the following form: SGbbbbbbbb where each b character in the reply corresponds to a bit in the serial poll response byte. If the b bit is a 1, that bit is the one that caused the last SRQ message.

3-10 POWER UP AND TESTING CONSIDERATIONS.

Whenever power is applied to the receiver it will execute a Power On Self Test sequence. This sequence tests several functions inside the receiver including memory tests, DSP processor memory test, and a confidence test of the configuration options stored in non-volatile memory, and a BITE (built in test equipment) test of receiver functions. If any of these tests fails, the receiver will not enter into normal operation, but will wait for an operator action to ensure that any failures will not go unnoticed. From the front panel, the display will show the message "Hit any Key to Continue". Since it is often required that the receiver not send any unsolicited bus messages, receivers configured with the serial interface will not announce this wait condition over the bus. IEEE-488 units will assert the SRQ line and set bit 3 of the Serial Poll response byte. During this wait condition, the receiver will only respond to a limited subset of commands from the bus. These are:

:? Request interface status message (serial only) Serial Poll Sent in response to a SRQ (IEEE-488 only)

PO? Request results of Power On Self Test ! Clear wait condition and proceed with startup

For serial interface units in this wait condition, if the :? command is sent, the receiver will respond with:

TE:EEPR or TE:POST

Each bit of the serial poll response byte may be masked off to prevent it from generating an SRQ message on the bus. This message is of the form: SMbbbbbbbb where each b is replaced with a 1 to allow that bit to generate an SRQ or a 0 to 'mask off' that condition and prevent an SRQ from being generated. For example to allow all conditions to generate an SRQ except the Signal Present condition, send SM11111110. The default (power-on) status of this message is to allow all bits to generate an SRQ.

3-9.5 Device Clear And Selected Device Clear Response. When the receiver receives the Device Clear

(DCL) command or the Selected Device Clear (SDC) command, the receiver responds in the same way as if it had received the K command. This command stops any pending sweep or scan condition and places the receiver into the normal state.

This indicates that the receiver is waiting. IEEE-488 units will indicate this condition in bit 3 of the Serial Poll response byte. This condition can only be cleared by sending the ! command or by pressing any key on the front panel. To determine the reason for POST failure, the user should then request POST results (PO?) and if this shows BITE failure, also request the BITE results (BI?) after clearing the Power on Wait condition with the ! command.

The proper way to structure a remote control program to handle this condition is to query each receiver for interface status (:? or SRQ/Serial Poll) before sending any other commands at power up and wait for the reply. A reply will not be sent until a wait condition has been entered or normal operation has been entered. If the wait condition is indicated, send the ! command and test again. This process should be repeated until the receiver responds with an interface status other than TE: (serial interface) or shows Serial Poll bit 3 clear (IEEE-488 interface).

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3-11 EEPROM CLEARING.

If a POST failure was caused by a corrupted EEPROM (Interface Status TE:EEPR), send the ! command to clear the entire EEPROM to default values. This will cause the remote interface parameters to revert to the factory defaults which may be different than those that were selected from the front panel. In this case, the remote interface may become inoperative, and the desired remote interface parameters will have to be re-entered from the front panel.

SRQ

BAD

VALUE

MSG

BAD

The factory default remote interface parameters for the serial interface are as follows:

Address 000 Baud Rate 19,200 bits per second Bits 8 bits, 1 stop bit, no parity Bus Type RS-232 Bus Sharing enabled

For units configured with the IEEE-488 interface, only the address parameter is significant.

2467 5 3 1 0

POWER

WAIT

LOCAL

CNTRL

FAULT

SIGNAL

PRESNT

Signal Presnt This bit mirrors that status of the squelch. If the squelch is open, this bit is set true.

Fault This bit mirrors the status of the front panel FAULT annunciator.

Local Control When true, this bit indicates that the front panel LOC/REM switch has selected LOCAL operation, overriding

the remote control bus.

Power on Wait This bit indicates that the receiver has failed the Power-On Self Test and is waiting for a front panel key

press or the remote control ! command.

Bad Msg The last command message was not recognized as a valid command.

Bad Value The last command message was recognized, but contained an out of range numeric value.

SRQ The receiver is asserting the SRQ message on the bus when this bit is true.

Figure 3-11 IEEE-488 Serial Poll Response Byte.

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CHAPTER 4

GENERAL THEORY OF OPERATION

4-1 INTRODUCTION.

This chapter contains a block diagram description of the CDR-3250/80. Each of the boards/modules are discussed in the paragraphs below: (See figure FO-2.)

4-2 BLOCK DIAGRAM DISCUSSION.

4-2.1 AC Receptacle /RFI Filter. The AC Receptacle/RFI Filter keeps internally generated power supply switching noise off the AC input line. When the front panel power switch (S1) is set on, power is applied to the POWER SUPPLY module through the AC Receptacle/RFI Filter, and through the circuit breaker (CB1) on the rear panel.

4-2.2 AC Line Filter. The AC Line Filter board keeps internally generated power supply switching noise off the AC input line. When the front panel POWER switch is set ON, input power is applied to the POWER SUPPLY module through the AC Line Filter board.

4-2.3 Power Supply Module. The POWER SUPPLY module is a switching regulated type that provides +8, +17, and -17 VDC to the receiver modules through the motherboard using 90 to 260 VAC input power (automatically sensed). A separate +12 volt output is used for the fan on the rear panel. Fault detector circuits send a fault signal to the Control Section in the Digital module if any of the voltages fall below a preset level.

4-2.4 RF Analog Module. The RF Analog module contains the optional preselector, first mixer, first IF gain control, first LO, second mixer, second LO, and third 3rd mixer circuits. Each section is discussed below.

4-2.4.1 Preselector. The preselector assembly consists of an overload protection circuit, BITE (built-in test equipment) circuit, ten automatically selected filters, and an RF amplifier. The tuning range of 0 to 499 or 0 to 1,599 kHz is selected by one-of-two lowpass filters. For frequencies at or above 1.6 MHz, the spectrum is divided into eight bands of bandpass filters.

The incoming RF signal is applied through the rear panel antenna connector to the module. An overload detector and BITE circuit protects the filters by opening the RF line if the signal level exceeds approximately +24 dBm (1/4 Watt). Protection is provided for inputs up to 10 Watts.

Control data from the Control Section in the Digital module automatically selects the correct filter for the selected receive frequency using PIN diode switches. The serial control DATA from the Control Section is clocked into the shift register circuit. At the proper time, the DATA is latched into the shift register by the RF ENABLE signal. The shift register data then selects the correct filter, or activates the built-in test (BIT).

Built-in test equipment (BITE) testing is provided by disconnecting the antenna signal and using the 48 MHz signal developed in the Third LO section of the RF Analog module as a substitute signal to perform the BIT. During the BITE test, the PRE LO signal, under CPU control, is divided down to either 0.375 MHz or 0.750 MHz in the preselector, and the receiver is set to the ISB mode.

Each fundamental frequency and some odd harmonics are sequentially used to check each preselector band and the rest of the receiver circuits. The frequencies used are:

0.375, 1.125, 2.625, 2.25, 3.75, 5.25, 8.25, 11.25, 17.25, and

27.75 MHz. If the signals are not detected in the audio board after a certain amount of time, the test fails and the Control Section in the Digital module causes a fault to be displayed on the front panel.

4-2.4.2 First Mixer. The first mixer section converts the input signal to the first intermediate frequency (1ST IF) of

40.456 MHz. The input signal applied to the first mixer is filtered by a 33 MHz lowpass filter. The filter rejects the first local oscillator (1ST LO) frequency preventing it from being radiated back out the antenna. The filter also rejects input signals at the 1ST IF and image frequencies. The RF signal is mixed with the tunable 1ST LO frequency from the Synthesizer module, producing the 1ST IF. After amplification, a bandpass filter ensures that only the 1ST IF will pass.

4-2.4.3 First IF Gain Control. The first IF gain control circuits provide "front-end" gain control. The GAIN CONTROL voltage developed in the DSP section of the Digital module is used to control PIN diode attenuators for three gain control stages. The gain control section's output is applied to the second mixer section as the 1ST IF at

40.456 MHz.

4-2.4.4 First LO Driver. The 1ST LO signal is tuned to the correct frequency depending on the receive frequency and receive mode selected. The 1ST LO driver consisting of a preamplifier and push-pull amplifier, provides the proper level 1ST LO signal to the 1ST mixer. A fault detector

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sends the RF FAULT signal to the CPU if the 1ST LO signal level falls below a preset level.

4-2.4.5 Second Mixer. The second mixer section converts the 1ST IF at 40.456 MHz, to the 2ND IF of 456 kHz. The 1ST IF signal enters the section and is applied to the 2nd mixer. The 2ND IF at 456 kHz is produced by mixing the 1ST IF at 40.456 MHz with the 2ND LO frequency at 40.000 MHz. The signal is filtered, amplified, and applied to the third mixer, and to the rear panel as the WBIF signal.

4-2.4.6 Second LO. The second LO operates on a fixed frequency of 40.000 MHz. This frequency is derived by applying the 10 MHz reference signal to a pair of cascaded bipolar transistor frequency doublers. The first doubler is followed by a two-pole bandpass filter. The filter output drives the second doubler followed by a four-pole bandpass filter. The filter output is applied to the second LO driver in the second mixer circuit.

4-2.4.7 Third Mixer. The third mixer section converts the 2ND IF to the 3RD IF using the third LO signal. The 2ND IF signal enters the section and is applied to the 3rd mixer. The 3RD IF at 24 kHz is produced by mixing the 2ND IF at 456 kHz with the 3RD LO frequency at 480 kHz. The signal is filtered and amplified before leaving the section.

4-2.4.8 Third LO. The third LO circuit provides two fixed frequencies. The circuit uses a 48 MHz VCO phase locked to a 2 MHz reference (10 MHz ÷ 5) with a fixed loop divider of 24. The VCO signal is split and applied to the preselector for the BITE circuits, DSP circuits, and to a ÷100 circuit to generate the 480 kHz 3RD LO.

A fault detector sends the RF FAULT signal to the CPU if the loop looses lock.

4-2.5.1 Control. The serial control DATA from the digital module is clocked through a buffer into the fine phase-locked loop (PLL) circuits and through a shift register to the step PLL and audio circuits. At the proper time, the DATA is latched into the PLL circuits by the correct SYNTH ENABLE signal. The ENABLE signal also latches the data into the shift register for the audio section. The data latched into the PLL circuits is used to synthesize the desired frequencies from the 10 MHz reference. Two bits in the shift register select the correct audio source, and enable or disable the speaker.

4-2.5.2 Reference Frequency. The reference frequency source is automatically selected by a detector that senses the presence of an external reference signal. If the external reference is detected, it is used as the basis for the frequency generation. If the external reference is not sensed, the internal oscillator (TCXO or optional OCXO) is used for frequency generation. A potentiometer is used to adjust the internal reference if necessary.

The 10 MHz external reference frequency may be daisychained using the REF OUT connector on the rear panel. If the signal is not daisy-chained, the REF IN signal may be terminated if desired by connecting a 50 ohm load to the REF OUT jack.

4-2.5.3 1st LO Generation. The output loop circuits produce the 1ST LO signal for the first mixer circuits using the FINE LOOP and STEP LOOP inputs.

The frequency of the output loop VCO is controlled by mixing the VCO output with the STEP LOOP frequency. The resultant difference signal is frequency and phase compared with the FINE LOOP frequency to produce the output PLL DC control voltage.

Overall voltage gain through the module is approximately +72 dB.

4-2.5 Synthesizer Module. The synthesizer module provides the 1ST LO and 2ND/3RD LO frequencies used for signal frequency conversion. It also contains the reference frequency circuits for reference frequency generation and switching, and audio circuits for audio amplification and control.

Using the +8V, +17V, and -17V from the power supply, three internal voltage regulators (not shown) supply the required voltages to the entire module. These regulators are mounted directly to the module surface for optimum heat transfer.

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The VCO output signal takes two paths. One path is filtered and becomes the 1ST LO signal. The other path is mixed with the STEP LOOP signal, producing a difference frequency. The difference frequency is filtered through a lowpass filter and applied to a phase/frequency detector circuit.

The phase/frequency detector compares the difference frequency with the FINE LOOP frequency and develops a DC control voltage through a loop filter keeping the VCO on frequency. A wrong-side frequency detector ensures the output frequency locks only to the difference of the STEP LOOP minus the VCO output frequency. If the VCO frequency is higher than the step loop frequency, the circuit disables the difference frequency which causes the DC correction voltage to drive the VCO to a lower frequency.

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The signal leaves the module as the 1ST LO at 40.456 -

70.456 MHz in 1 kHz steps at a level of +10 dBm.

A fault detector sends the OUTPUT/FINE FAULT signal to the digital module if the output or fine loops lose lock. 4-2.5.4 2nd/3rd LO REF Generation. One path of the internal or external reference frequency signal is amplified and used as the 2nd/3rd LO REF signal at 10 MHz for application to the RF Analog module. The other path is split and used as the reference frequency for the fine and step loop PLL circuits.

4-2.5.5 Audio. The audio circuits are located in a separate shielded compartment in the synthesizer module. The shielding prevents interaction between the high-level audio and sensitive VCO circuits.

The NORM AUDIO and ALT AUDIO signals from the DSP Section in the Digital module are applied to the audio board. The ALT AUDIO signal supplies LSB audio during ISB mode operation only.

Audio from each of these inputs is applied directly to two line amplifiers. These amplifiers are used for the NORM and ALT line audio outputs. The line amplifiers are transformer coupled to achieve the desired balanced output. The line output levels are adjustable using potentiometers.

The audio inputs are also applied to an audio selector switch to route the desired audio signal to a third amplifier. This amplifier is used for the front panel PHONES jack. The amplifier's output is single-ended and protected by resistors. The VOL CONTROL voltage for the phones amplifier is supplied from the front panel volume control. During the BITE check, the audio signal is sensed by an audio detector. If the detector does not sense a signal during the test, the /DET AUDIO signal is not sent to the Control Section in the Digital module. The Control Section then causes the fault to be displayed, and stores it in memory. The speaker audio is disabled during the BITE check of the power-on self test (POST), but enabled during the operator selected BITE check. (Refer to paragraph 5-

5.2). 4-2.6 Digital Module. The Digital module contains two

major sections: the Control Section, and the DSP Section. Each of these sections is described below.

4-2.6.1 Control Section. The Control Section governs all aspects of the receiver's operation. The Control Section receives commands from the operator through the keypad or from the optional remote control bus, and provides status and data information to the operator through the front panel display and the remote control bus. All receiver

operating parameters, such as frequency, mode, IF bandwidth, and gain are directly controlled by the Control Section. In addition, the Control Section can store up to 250 different sets of operating parameters into memory channels. These memory channels can be recalled individually, scanned sequentially, or used in pairs as band limits for frequency sweeps. The current operating parameters and the 250 memory channels are stored in nonvolatile memory and are retained when power is removed.

The Control Section contains a microprocessor containing a 16-bit internal data bus, with an 8-bit external bus. The clock frequency is 16 MHz using an external 32 MHz crystal. The program is stored in a 128k x 8-bit flash memory, and data memory consists of a 32k x 8-bit static RAM IC. Channel memory and other miscellaneous nonvolatile storage requirements are provided by an 8k x 8-bit EEPROM.

An encoder logic circuit receives data inputs from the front panel adjustment knob optical shaft encoder. The shaft encoder is mounted on the shaft of the knob and produces two signals used to determine the amount and direction of knob rotation. The keypad encoder provides the interface between the front panel keypad and the Control Section. A key press is sensed as an interrupt input to the processor. The full graphic vacuum fluorescent display in the front panel contains a processor bus interface connecting directly to the buffered data bus.

I/O ports provide all processor output to the analog and DSP sections of the receiver. D-latches are clocked by decoded addresses gated with a processor write signal. Some of these latched output lines are grouped together as enable, clock, and data lines and are operated by the processor as synchronous serial ports. Other latched output lines are used as direct control signals.

I/O signals include:

/FAULTs Input from the modules indicating

a fault condition.

/DET AUDIO Input from Audio board in

Synthesizer module to determine if BITE signals pass completely through receiver circuits.

CMD FLAG Informs the DSP Section that the

command register contains a CMD MSG ready for transfer.

CMD MSG Control data from the Control

Section to the DSP Section.

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CDR-3250/80 TECHNICAL MANUAL

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STATUS MSG Receiver status information (current

signal strength, audio output level, etc.) from the DSP Section.

STATUS RDY External flag interrupt to inform the

Control Section that the DSP Section's output register contains the STATUS MSG for transfer.

ENABLE Enables each receiver module or

circuit.

CLOCK Clocks out the control data to all

modules.

DATA Control information to each

module or circuit.

C.O.R. Carrier operated relay signals to rear

panel.

Either a serial or IEEE-488 remote interface plug-in daughter board is installed as the remote control option. If the receiver is configured for serial bus operation refer to paragraph 4-2.7. If the receiver is configured for IEEE-488 bus operation refer to paragraph 4-2.8.

4-2.6.2 DSP Section. The digital signal processing (DSP) section provides the following conventional receiver functions: fourth LO, fourth mixer, IF filtering, AGC, IF gain control, BFO, detection, demodulation, and receive frequency tuning resolution in 1 Hz steps.

The DSP section contains an analog to digital converter, digital signal processor, I & Q line driver, 128k x 8-bit flash memory, 64k x 32-bit SRAM, IF reconstruction circuit, and multiplexed digital to analog converter.

The DSP Section operates semi-independently from the Control Section. All communication between the Control Section and the DSP Section is through the I/O ports in the Control Section. When the receiver operating parameters are changed, the Control Section sends one or more commands to the DSP Section which makes the necessary changes to its operation, and then continues processing.

The analog-to-digital converter converts the 3RD IF analog signal at 24 kHz to a digital signal for the digital signal processor. The 3RD IF signal is applied to the A/D converter where it is sampled at a 96 kHz rate. This sampling rate is the DSP clock frequency (48 MHz) divided by 500. The 48 MHz is generated by the VCO in the Third LO section of the RF Analog module which also generates the 3RD LO signal. This selection of frequencies allows all

internal signals to be phase locked to the reference frequency standard.

The broadband digitized 3RD IF signal from the A/D converter is applied to the digital signal processor where filtering and demodulation takes place mathematically. DSP functions are all performed by firmware within the DSP microprocessor.

(See figure 4-1). The sampled IF input signal from the A/D Converter at 96 ks/s is applied to a downconverter. This function produces the "I" (In-Phase) and "Q" (Quadrature) signals and reduces the sample rate to 24 ks/s. At this point the tuned frequency is represented by an I&Q vector rotating in either direction at up to 500 Hz (-500 to +500 Hz).

The I&Q signals are applied to a frequency translator function. The digital FINE LO signal, representing the fine tuning frequency, is also applied to the frequency translator. The translator applies a rotation between +500 Hz and -500 Hz to the vector which translates the tuned frequency to 0 Hz (no rotation). This process provides fine tuned I&Q signals with a resolution of 1 Hz.

The outputs of the frequency translator are independently applied to two identical lowpass Finite Impulse Response (FIR) filters. Fifty-one FIR filters can be selected ranging from 100 Hz to 16 kHz. This function provides the overall IF bandpass function in a conventional receiver.

The outputs of the FIR filters are applied to a complex scaling function. Digital gain control is applied to the complex scaling, effectively varying the signal gain. Either automatic or manual gain is provided when selected. AGC uses a combination of the values from the sampled IF and AM detected digital signals to provide both digital and front-end gain control. The front-end gain signal is used in the RF Analog module. When selected, the MGC signal is applied to the gain control function from operator input through the Control Section.

AM demodulation is done mathematically using the signal magnitude, which is calculated as the square root of the sum of the squares of the I&Q outputs of the FIR filters. The signal magnitude is also used to develop AGC when selected. SSB and CW demodulation uses the digital equivalent of a product detector. The signal is translated from 0 kHz to approximately 1 kHz using a numerically controlled oscillator (NCO). The NCO frequency is set either positive or negative, depending on whether USB or LSB reception is desired. In the ISB mode, the normal channel functions provide USB and are duplicated in an alternate channel to provide LSB. The functions include input frequency translation, IF filtering, and the product

4-4 Issue 2.2

Cubic Communications CDR-3250, CDR-3280 Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

GENERAL DESCRIPTION