Microwave Radio Communications STATXU2D Users Manual

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Strata Transmitter

Operations Guide

Revision 3.0

May 2003

Microwave Radio Communications 101 Billerica Avenue, Bldg 6 (978) 671-5700 N. Billerica, MA 01862-1256

www.mrcbroadcast.com

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101 Billerica Ave., Bldg. 6 N. Billerica, MA 01862-1256 Tel: (978) 671-5700 Fax: (978) 671-5800

WARNING!

THIS EQUIPMENT IF HANDLED IMPROPERLY WILL

POSE A RADIATION HAZARD

Microwave Radio Communications Inc. in compliance with RF exposure limits set forth in OET Bulletin 65, Edition 97-01 utilizes this page for the intent of expressing our concerns to the user of this equipment STRATA 2 GHz Transmitter Unit (TXU) that there exists a radiation hazard with improper use of this equipment.

The STRATA transmitter with rated 2-WATT RF Power output is designed as an intentional radiator, as such, this device has been designed to produce and emit radiation into an isotropic antenna for the purpose of delivering a digitally modulated signal to an appropriate receiving device.

Due to the low output power of this device in and of itself it poses no such hazard until connected properly and securely to a properly matched antenna. Therefore it is necessary for the equipment operator to be made aware of the safe operating parameters of this device. Below is a chart based on the use of a 5dBi Omni directional antenna. The radiation limits at a distance of below 20cm exceeds the allowable safe exposure limits. Beyond a distance of 20 cm you will notice that the usable antenna gain (expressed in dBi) increases logarithmically with distance spherically from the radiator.

In the case of an antenna with a concentrated beam such as a parabolic antenna, the caution to exposure levels would be relative to antenna gain and distance only with in the radiation pattern of the parabola. Notwithstanding, radiation exposure due to antenna inefficiency (side lobe and front to back emission) although severely reduced should be calculated. A case-by-case analysis of each antenna that is to be utilized with this device should be investigated.

The intent of this document is to bring awareness to the operator of this device the potential for hazardous RF exposure limits if improperly used. Microwave Radio Communications Inc. cautions the user to contact our customer service department to receive exposure data or the antenna manufacturer to receive the radiation pattern of the antenna if not purchased through Microwave Radio Communications Inc.

Radiation Limit for Portable Transmitter at 2WATT (+33dBm)

MPE Based on 5dBi Omni Antenna

mW/cm^2

5dBi Omni

5.02099 -2.007 (Max Allowable Antenna Gain dBi)

2.231555 1.513

1.25525 4.012

0.80336 5.95

0.557889 7.534

0.409877 8.87

0.313812 10.033

0.247951 11.056

0.20084 11.9

0.089262 15.49

Distance cm 10 15 20 25 30 35 40 45 50 75

RF radiation exposure levels below 1Mw/cm^2 are permissible levels in accordance with

OET Bulletin 65, Edition 97-01. The above graph depicts permissible levels at required safe distances from the isotropic radiator. The incremental gain of the radiator can be increased in accordance with the distance of the human body removed from the radiator by the corresponding distance in centimeters. As can be observed, the distances are marginal but notice should be observed never the less.

Introduction

The Microwave Radio Communications (MRC) Strata system provides a reliable and highly flexible video microwave transport system. This operations guide provides basic system operations information and details for hands-on operation of this equipment.

System Description

Figure 1 below shows the overall Strata system architecture for a fully equipped system.

1.84 MHz OOK Tone

NTSC

PAL

SDI ASI IF

RS-232

! !

Telemetry Telemetry

TCU TXU HPU

IF or Baseband Si gnal DC Simplex Powering

12 v to 48 v

RS-232

12 v to 48 v

Figure 1 – Strata Transmitter System Architecture

The primary system features are:

o Lightweight, Modular, Multi- Un it Desig n o Analog, Digital, or Analog/Digital Switchable o MPEG Encoding (4:2:0, 4:2:2) o COFDM Modulation with Selectable Guard Interval o Digital Modulation for QPSK, 16QAM, and 64QAM o NTSC or PAL Modulation with Audio (4 mono or 2 stereo) o Tripod, Half Rack, or Full Rack Mounts o Front Panel Remote Controlled o Bands from 2 to 15 GHz o Wide Choice of Antennas

RF/DC

RF OUT

Dummy Load

Note that the TCU (Transmitter Control Unit) and the TXU (Transmitter Unit) may be operated in a stand-alone configuration depending on specific video transport applications.

TCU Description

The TCU component can accept a wide variety of signal formats and provide several different output signal formats. Figure 2 below shows the basic functions of the TCU.

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COAX IN

NTSC

PAL

SDI

ASI

Filter

SDI ASI

MPEG CV

Note: Either or both MPEG/COFDM or FMT boards may be installed

FMT CV

MPEG

COFDM

FMT

ASI

COFDM

70 MHZ

ASI Only Mode

IF CV

70 MHz IF Bypass

Telemetry

MONITOR

COAX OUT

COFDM

IF CV

ASI

Figure 2 - Strata TCU Functional Diagram Note: The TCU may be supplied with or without the MPEG/COFDM or FMT options.

TXU Description

Like the TCU component, the TXU can accept a wide variety of signal formats but includes an RF upconverter for use in transporting signals over a microwave radio link. Figure 3 below shows the basic functions of the TXU.

ASI MON

ASI COFDM

70 MHZ

70 MHz

IF/RF Up Converter/Amplifier

70 MHZ

SIGNAL IN

NTSC

PAL

SDI

ASI

Telemetry

SDI/ASI

Filter

SDI MPEG MPEG CV

MPEG

COFDM

ASI Input

FMT CV

FMT

Figure 3 – Strata TXU Functional Diagram

Note: The TXU may be supplied with or without the MPEG/COFDM or FMT options.

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RF OUT

HPU Description

For those applications requiring a higher RF output level, the HPU (High Power Unit) may be used to boost the signal level to between 2 and 12 watts of microwave output power depending on the modulation format used. Figure 4 below shows the functional architecture of the HPU device.

HPURF IN RF OUT

Figure 4 – HPU Functional Diagram

Theory of Operation

The Strata TX system is comprised of the following primary components:

• Command and Control Power Supply module

• Combiner Circuit

• MPEG encoder/COFDM modulator module (digital mode)

• FMT (FM Transmitter) (analog mode)

• IF/RF Unit

• HPU (High Power Unit)

Note that some or all of these components may be included in a fully functional Strata TX system depending on specific customer applications, e.g., switchable analog and digital transmitting system, etc. Where switchable analog and digital video transmission is required, the Strata TX system installs the digital and analog video modulator modules and the IF/RF module in separate housings. In this case a TCU (Transmitter Control Unit) houses the MPEG/COFDM, FMT and Combiner circuits with the IF/RF unit installed in a separate TXU (Transmitter Unit) housing. This arrangement also allows the video modulation components (TCU) to be physically separated from the IF/RF up-converter by up to 600 feet.

Command and Control Power Supply

The TCU and TXU Command and Control/Power Supply modules contain external and internal communications circuitry as well as supplying the necessary system voltages. The power supply portion accepts a wide range DC input voltage (+10.5 to +48 volts) and distributes appropriate output voltages to the various circuits. The command and control circuits handle inter-module communications and provide external RS-232 communications to external peripheral equipment, such as a remote control device (helicopter operation) or to a PC capable of running Windows based configuration software. An on-board microprocessor manages the system configuration and operation of all modules to which it is connected, i.e., MPEG/COFDM, FMT, IF/RF modules, etc. In addition, for those applications that employ both TCU and TXU housings, a communications link superimposed over the inter-connecting IF coaxial cable provides communications to all system modules. This ensures the TCU and TXU may control each other’s operation, i.e., permit switching modes of operation, change system presets, etc.

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Therefore, where both a TCU and TXU are used, total system control may be accomplished using front panel or remote control from either housing.

MPEG/COFDM Encoder/Modulator

This is the heart of the Strata TX digital mode circuitry. This versatile circuit may be configured to accept a wide range of digital or analog video and audio signal inputs and provide COFDM (70 MHz), IF (70 MHz) or ASI video signal outputs. When installed in a TCU housing, the various signal inputs and outputs are connected through the TCU Combiner circuit where the various signal inputs and outputs are switched using software controls.

FMT

The optional FMT module accepts standard NTSC or PAL analog video and audio signals and FM modulates these signals on a 70 MHz carrier. Using the MRC supplied configuration software, four different audio sub-carrier frequencies may be defined in which up to four standard audio signals may be transported with the associated video signal. Note that audio deviation levels are software controlled and must be provisioned at the MRC factory when ordering this option.

TCU

The TCU may house either or both digital and analog video modulation modules. Where a customer application might initially employ only analog video transmission but anticipates migrating to dual (switchable) analog and digital operation, the TCU may be upgraded to add the MPEG/COFDM module to provide this additional capability. Where only digital or analog video transmission is desired, the MPEG/COFDM or FMT modules may be installed in a TXU housing thereby eliminating the need for a TCU. Note that the Strata TX design does not permit splitting digital and analog video modulator modules between a TCU and TXU. A TCU configuration may also include a “stand-alone” option where either or both MPEG/COFDM and FMT modules may be used independent of the TXU. This arrangement permits using a TCU equipped with analog and/or digital video modulation modules for a variety of signal input and signal output configurations, including a digital option using NTSC or PAL composite video input and ASI (digital) signal output.

TXU

The TXU always houses the IF/RF module, which accepts either a 70 MHz COFDM, FMT IF, or external 70 MHz input signal and up-converts these signals to the appropriate RF band. The RF frequency synthesizer circuit included in the IF/RF unit, along with the command and control module, provide the means to channelize RF video and audio signals in the 2 GHz RF band. Standard U.S. FCC band plans, as well as customer created channel plans, may be accommodated using the Strata TX Windows based configuration software. As noted above, the TXU may also include either an MPEG/COFDM or FMT module (but not both) in which case the TXU serves as a stand-alone digital or analog video microwave transmission system.

HPU

The optional HPU (High Power Unit) is designed to work with a companion TXU in which case RF output signals from the TXU are connected to the RF input jack of the HPU. In the case of analog microwave transmission, the RF output of the TXU is amplified operating the HPU RF amplifier in the non-linear region (saturated) providing RF output levels at the 12 watt level (+41 dBm). In the case where COFDM RF signals are used, software controlled back-off attenuation is applied to operate the HPU RF amplifier in the linear region.

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These back-off levels are carefully measured and configured as part of MRC factory adjustment procedures and ensure digital mode RF output signals provide optimum performance. Therefore, depending on what digital mode modulation format is selected, i.e., QPSK, 16 QAM or 64 QAM, or if an HPU is used, previously configured transmitter back-off levels are applied to ensure the Strata TX RF output signals operate with minimum Inter-Modulation Distortion (IMD). These carefully measured and configured transmitter back-off levels are stored in the TXU IF/RF unit and are applied depending on which particular operating mode is selected. Typical digital mode RF levels vary from 5 watts to 2 watts output depending mostly on the modulation format selected.

Overall Operational Details

The following details apply when operating the Strata system using either the TCU or TXU front panel controls:

1. When companion TXU or TCU devices are inter-connected via coaxial cables, an int er-unit telemetry

link is established. This feature allows overall system operation and configuring to be accomplished from either the TCU or TXU devices if both are used. For example, the microwave transmitter may be keyed ON or OFF from either device.

2. A configuration software tool (Strata TX Configurator) may be used to review and modify certain

system configuration options as described in this document.

Special Note: All radio systems leaving the MRC factory are adjusted per standard industry (default) settings, i.e., video and audio levels versus FM deviation (analog), as well as digital and analog IF and RF levels, etc. In addition, transmitter back-off (IMD) and analog audio levels are carefully adjusted using special software tools. Many of these settings are software controlled and cannot be adjusted in the field.

How to View Configuration Parameters and Control the TCU/TXU Units from the Front Panel

Figure 5 below shows the basic TCU/TXU control functionality using the front panel control switch:

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Display Monitor Screen

Push to Select

Rotate to Change

Push to Select

Figure 5 – Front Panel Switch Control

TCU/TXU Front Panel Control Settings

The front panel control switch is used to select a limited number of front panel control functions. Rotating the switch counterclockwise allows access to mode selection choices, while rotating the switch clockwise allows access to monitoring the current mode of operation. The plunger action of the switch is used to select the appropriate mode of operation. The TXU and associated HPU (High Power Unit), if equipped, is keyed ON or OFF by compressing and holding the front panel control switch for one second from any menu page. The Strata TX system is transmitting when the front panel blue “XMIT” LED is illuminated. When the menu display is inactive for more than 7 seconds, the display will revert back to the main menu.

The following front panel control selections are available:

• Set RF Channel

• Change Preset – Presets #1 to #9

• Set Power Out – HPU attenuation control

• HPU Present

• 75 Ohm Coax DC Power ON/OFF – Coaxial cable DC power ON/OFF control

Note: The remainder of front panel selec ti ons allow monitoring previously configured parameters and system status, including alarm indications, power output, etc.

Details related to the use of Strata TX front panel controls are found on the following page.

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RF Channel Select

The radio is pre-programmed with a number of RF channel frequencies associated with up to 9 preset configurations. Use this feature to monitor the currently configured RF frequencies. Note: If these

frequencies are known as part of a customer order, they may be factory set to customer requirements or added or modified per customer request.

Select Preset Setting

Used to select a pre-configured configuration. Up to 9 different configurations may be stored and configured in conjunction with the Strata TX Configurator utility.

Set Attenuation Value (Transmitter Back Off Level)

Used to set the transmitter output power (and linear operating point) of the radio system. Adjustable from 0 to 31 dB in 1 dB increments. Push to select.

Note: Maximum power output occurs with 0 dB of attenuation applied.

75 Ohm Coax ON/OFF

Used to activate or de-activate DC powering a TCU or TXU through the inter-connecting IF coaxial cable.

Front Panel Transmitte r Po we r Mon ito rin g

The current TX output power reading available on the front panel may be used as a general reference and is accurate to within +/- 1 dB.

HPU Present

Identifies and configures use of the HPU option connected to the TXU device.

Please see the front panel menu guide on the following page for details related to front panel operation.

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Strata Front Panel Operation

Control Me nu Access

Scroll Menu Button to Left - Push to Select

( Default to Main Menu after 7 seconds of inactivity)

Set Channel

Ch 9

Change Preset

Preset #1

Set Power Out

Atten 0 dB

HPU Coax

HPU Present

75 Ohm Coax

Power On

Note:

For helicopter applications the c hannel select will be included with the preset conditions.

1) Push to activate

2) Rotate to change

3) Push to select back to main

menu after set

1) Push to activate

2) Rotate to change

3) Push to se lect - up to 9 pre s ets back to main

menu after set

1) Push to activate

2) Rotate to change

3) Push to select - 0 -31 dB values

Caution:

Enables HPU opera tio n and DC voltage on coax (from th e TXU) when transmitting - push to activate or deactivate HPU.

Caution:

This function enables DC voltage t o flow between the TC U and TXU on the IF coax cable - push to turn On and Off.

Presetable Parameters

Video Input Chroma Delay Mode FEC ASI Output COFDM Bandwidth BISS - On/Off Guard Interval BISS Key Modulation Audio Input Conditions A & B VBI - On/Off Audio Mode Con d i tio ns Color Bars/Pilot Condition - Service Name/Network Name IF Mode of Operat ion Analog Audi o S ubcarrier On/Off

nalog Audio Subcarrier Frequenc

@ DC Power Up

Preset #1

HPU In C9

Control Me nu Access:

Scroll Menu Button to Right to Monitor

RF Configuration status (Pout level - TXU only)

Mode

MPEG Output

NTSC

Vid In 4:2:0

Video Delay

Normal

ASI Bit Rate

10.2000 Mbs

MPEG Audio A

Analog Stereo

MPEG Audio B

Analog Stereo

Color Bar Off

Error Page

Note:

Last operational state will be saved on power down.

Mode

Ext IF Input

COFDM Config Status with bit rate flashing

Video Input Status & MPEG Chroma

Video Input error flashes w/ no video

Video delay

MPEG Audio A Config Sta tus

MPEG Audio B Config Sta tus

Color Bar & Pilot Status In dicator

Strata Front Panel Guide Diagram

Turn Transmitter ON from any menu screen -

menu button in for 1 second Blue TX light ON

2475.500 MHz

FEC 1/2 GI 1/8

Video In 4:2:0

MPEG Audio A

Analog Stereo

MPEG Audio B

Analog Stereo

Color Bar Off

Error Page Error Page

HPU Off C9

Mode

COFDM - IF

QPSK 8MHz

NTSC

Video Delay

Normal

Pilot Off

Push

Caution:

DC ouput voltage from TXU is slaved to the blue light condition shown as the "HPU In" condition whe n transmitting.

Monitor Menus

A Function of IF Mode Selection

Mode

Analog - IF

Audio #1 On Pre 4.83MHz

Audio #2 On

Flat 6.20 MHz

Audio #3 Off

Pre 6.80MHz

Audio #4 Off

Pre 7.20MHz

Vid Dev 4MHz

Pre 525L In

Pilot Off

Mode

COFDM ASI In

QPSK 8MHz

FEC 1/2 GI 1/8

Color Bar Off

Pilot Off

Refer to MID errors

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Supported Strata TX System Configuration Options

The following information may be used to identify which Strata TX system options may be used for specific customer applications.

TCU Supported Signal Options

Hardware Option Signal Input Signal Output Monitor Out Notes

* MPEG/COFDM Only NTSC/PAL ASI Various formats * MPEG/COFDM Only SDI (525/625) ASI Various formats * MPEG/COFDM Only NTSC/PAL COFDM - IF COFDM Various formats * MPEG/COFDM Only SDI (525/625) COFDM - IF COFDM Various formats * MPEG/COFDM Only ASI COFDM - IF COFDM Various formats * MPEG/COFDM Only IF IF IF IF Bypass Mode

FMT Only NTSC/PAL IF CV IF CV NTSC/PAL CV IF FMT Only IF IF IF IF Bypass Mode

* MPEG/COFDM + FMT NTSC/PAL ASI Various formats * MPEG/COFDM + FMT SDI (525/625) ASI Various formats * MPEG/COFDM + FMT NTSC/PAL COFDM - IF COFDM Various formats * MPEG/COFDM + FMT NTSC/PAL IF CV IF CV NTSC/PAL IF * MPEG/COFDM + FMT SDI (525/625) COFDM - IF COFDM Various formats * MPEG/COFDM + FMT ASI COFDM - IF ASI or COFDM Various formats * MPEG/COFDM + FMT IF IF IF IF Bypass Mode

Notes: * = ASI output possible when TCU used in stand-alone (MPEG only) mode

TXU Supported Signal Options

Hardware Option Signal Input Signal Output Notes

MPEG/COFDM Option NTSC/PAL COFDM - RF Various formats MPEG/COFDM Option SDI (525/625) COFDM - RF Various formats MPEG/COFDM Option ASI COFDM - RF Various formats MPEG/COFDM Option IF RF Up-converted Channelized RF signal

FMT Option NTSC/PAL CV - RF NTSC/PAL CV Channelized RF FMT Option IF RF Up-converted Channelized RF signal No options installed IF RF Up-converted Channelized RF signal

Note: TXU supports either MPEG/COFDM option or FMT option, but not both.

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Configuring the Radio System using the TCU/TXU Serial Port and the

“Strata TX Configu r ator” Software Ut ility

Basic Strata TX Configuration Details

The following basic system configuration settings may be administered using the Strata TX Configurator software utility.

• COFDM IF Mode – 70 MHz COFDM IF output from the internal COFDM/MPEG board supplied to

output and monitor ports (to TXU if present).

• IF Input – 70 MHz IF input signal from input connector routed through TCU to TXU (if present).

• ASI Input – Bypasses internal MPEG encoder and routes an externally supplied ASI stream to the

monitor and output connectors (to TXU if present).

• MPEG ASI Output – supplies a DVB ASI transport stream to the signal output connector and the

monitor output connector. Note: This mode is only accessed when the TCU is operated in a stand-

alone configuration.

• Analog Audio/Video – Routes 70 MHz FM output to TXU (if present). This mode is only supported

with the FMT option installed.

• DVB-S – This operational mode uses a single carrier modulator scheme and supplies a 70 MHz IF

output to the signal output connector and the monitor output connector, only operational for QPSK and 16 QAM. Note: This mode is currently not supported in the current software release.

• RF Frequency

Used to select an RF frequency from 1.99 GHz – 2.50 GHz (up to 5 decimal places).

• Modulation Type

Used to select each digital modulation mode for COFDM operation and DVB-S mode (when applicable) – QPSK, 16 QAM, 64 QAM. Note: 64 QAM modulation may not be used in the DVB-S

mode of operation.

• FEC Type

Used to select each FEC (Forward Error Correction) scheme to be used – (1/2, 2/3, 3/4, 5/6, 7/8).

• COFDM Guard Interval

Used to select the individual Guard Interval for COFDM operation only – 1/32, 1/16, 1/8, 1/4.

• COFDM Bandwidth

Used to select COFDM bandwidth operation – 6 MHz, 7 MHz, or 8 MHz.

• Video Input

Used to select the necessary video input for the MPEG encoder from the following selections: NTSC composite video, PAL composite video, SDI – 525 line, SDI – 625 line.

• Chroma

Used to select MPEG chroma profile – 4:2:0 (420 profile @ main level), 4:2:2 (422 profile @ main level).

• Color bars

Used to turn the internal color bars generator ON, OFF or place in AUTO mode – (used in IF digital modes only). Color bars will display a user programmed Service Name parameter if applied. Video input is bypassed when ON. Auto mode will insert color bars when no video input is detected

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Audio Input – A

Used to select the following audio operational modes for MPEG encoder A input:

• OFF – Audio transport stream is not generated and enabled

• Test Tone – An internal 800 Hz test tone is enabled.

• Analog Mono – Two independent mono audio channels are enabled.

• Analog Stereo – Left and right audio channels are enabled.

• SDI Embedded Mono – Unit expects an embedded audio stream from an SDI video source.

• SDI Embedded Stereo – Unit expects an embedded audio stream from an SDI video source.

• AES/EBU Mono – Unit expects a digital audio input stream.

• AES/EBU Stereo – Unit expects a digital audio input stream.

Audio Input – B

Used to select the following audio operational modes for MPEG encoder B input:

• OFF – Audio transport stream is not generated and enabled

• Test Tone – An internal 800 Hz test tone is enabled.

• Analog Mono – Two independent mono audio channels are enabled.

• Analog Stereo – Left and right audio channels are enabled.

• SDI Embedded Mono – Unit expects an embedded audio stream from an SDI video source.

• SDI Embedded Stereo – Unit expects an embedded audio stream from an SDI video source.

• AES/EBU Mono – Unit expects a digital audio input stream.

• AES/EBU Stereo – Unit expects a digital audio input stream.

Audio Notes:

A) 48 KHz sampling is used for all audio (384 Kbits per stereo channel). B) When using Alteia IRD with Audio A ON and Audio B OFF, Audio A is duplicated on Audio B

output XLR connectors.

C) When using Alteia IRD and 4 audio signals, the preferred language setting for Audio B must

differ from Audio A for decoding audio transport streams, e.g., set for Spanish.

Frequency Control Modes

The Strata TX system permits two different frequency control modes. The two frequency control modes are:

Frequency-Locked-to-Presets Frequency-Unlocked-to-Presets

Definition of Frequency-Locked-to-Presets mod e frequency as channelized in a channel assignment table. The channel assignment table is normally populated with the standard U.S. 2 GHz standard band plan channels, i.e., channels versus frequency, but may have some or all channel assignments, e.g., channel +4, changed by the user to accommodate nonstandard frequencies (so long as they are in the specified band and a multiple of the frequency synthesizer step frequency). Note that the user may modify the channel versus frequency table using the Strata TX Configurator software utility. Hence in this mode of operation, selection of any one of 9 presets may, and normally would, have an associated frequency (channel) locked to the selected preset.

- In this mode, each preset is assigned an operating

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NOTE: Even though each preset in a system configured to operate in the Frequency-Locked-to-Preset

mode has a pre-assigned frequency, the user may temporarily dial in a new channel (frequency) from the front panel which will remain in effect until, (1) the unit is power-cycled, or (2) a new preset is selected. Either condition will automatically select the frequency associated with the current preset, i.e., revert back to the pre-assigned frequency associated with the current preset.

Definition of Frequency-Unlocked -to - Preset s mod e:

associated with or locked to any preset. Regardless of all other preset configuration parameters, the last selected frequency (channel) will be the frequency used for all presets. To change the frequency (while any preset is selected), the front panel control is u sed to select a new (channe liz ed) freq uency. The last frequency selected will remain programmed as the current (default) frequency until changed by the user using the front panel control. Turning the system power off and back on or selecting a new preset will not change the currently selected frequency.

Remember, the selection of frequency control modes, i.e., frequency locked to presets, or frequency unlocked to presets, cannot be changed in the field.

Preparations

The following preparations should be completed prior to attempting to configure the Strata TX radio system using a serial data connection:

Establish serial data connections to and from the radio system. See the sketch below for details on how to connect a PC to the Strata TX radio system.

In this mode, no channel (frequency) is

PC Null Modem Connection Strata TCU or TXU

Figure 5 – Serial Data Connection Details

Notes:

• A serial data connection may be made to either a TCU or TXU pair so long as the TCU and the TXU

are inter-connected with a coaxial cable (enables system telemetry link and permits simplex powering of adjacent units). Both units must be powered ON.

• Use a standard 9 pin RS-232 serial data “null” modem connection (DTE-to-DTE configuration)

between the PC and the radio unit(s) as shown in Figure 5. above. Recommended serial data cable length not to exceed 50 feet.

• The system being configured should be interconnected as it will be used, i.e., all units inter-connected

properly with the appropriate RF termination connected to either the TXU or HPU RF output connector. Note that some applications may use a TCU or TXU in a “stand-alone” mode.

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1.84 MHz OOK Tone

NTSC

PAL

SDI ASI IF

RS-232

! !

Telemetry Telemetry

TCU TXU HPU

IF or Baseband Si gnal DC Simplex Powering

12 v to 48 v

RS-232

12 v to 48 v

RF/DC

RF OUT

Dummy Load

Typical Strata System Configuration Setup

Strata TX Powering Options and Cautions

Note the following recommended Strata system powering options and rules.

1. TCU stand-alone powering: +12 volts to + 48 volts DC.

2. TXU stand-alone powering: +12 volts to + 48 volts DC.

3. TCU and TXU adjacent: +12 volts to + 48 volts DC. *

4. TCU separated from TXU/HPU (TXU supplying power): +48 volts DC (for distances > 100 feet). **

5. TCU separated from TXU/HPU (TCU supplying power): +24 volts (minimum). ***

Notes:

* When powering adjacent TCU/TXU configurations, apply power to both TCU and TXU units. ** Special rules apply for longer distance separation applications depending on coaxial cable type,

distance and whether an HPU is used.

*** Necessary to reduce current drain over IF coaxial cable – recommend +48 volts.

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* * * CAUTION * * *

DC Voltages Present on Coaxial Cable

Center Conductors

Use Caution

For those Strata TX configurations that employ 2 or 3 modules, e.g., TCU + TXU + HPU, etc., the TCU and/or TXU may be used to power adjacent modules by superimposing DC voltage on the interconnecting coaxial cable center conductor. This feature is activated using the Strata TX front panel controls and remains in effect until subsequently modified by the user. The voltages involved range from + 12 to + 48 volts DC (DC input voltage).

To avoid damaging radio and test equipment input circuitry, be certain you either remove or isolate superimposed DC voltages from interconnecting coaxial cables where necessary to protect externally connected equipment.

In the case of the TXU-to-HPU RF coaxial cable c onnection, the center conductor will have DC vo ltages superim posed on the RF cable center conductor in order to power the HPU. If the TXU RF output is connected directly to an antenna or test equipment, be certain to disable the HPU On feature and therefore remove the DC voltage superimposed on the TXU RF output.

The Strata TCU “S ignal In” BNC connector on the rear of the TCU module is susceptible to damage if DC is present on the center conduc tor. Take care that the TXU-to-TCU interconnecting coaxial cable (if used) is not inadvertently connected to the “Signal In” connector instead of the “Signal Out” connector. Please see the image on the following page for additional details.

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TCU “Signal In” Connection – not DC isolated

Note:

To minimize the potential for damaging the TCU signal input circuitry, the “Signal Out” jack rear panel BNC connector has been changed to a TNC type connector. Users are cautioned not to use a TNC-toBNC adapter on the TCU “Signal Out” jack to circumvent this protection feature. Each Strata TX system that includes TXU and TCU modules is shipped with a short BNC-to-TNC coaxial cable assembly for interconnecting TXU and TCU modules. For those system applications that require separating the TXU and TCU over longer distances, users are advised to use a BNC “barrel” adapter on the BNC end of the supplied coaxial cable assembly.

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Step-by-Step Procedure

Use the following Strata configuration procedure when verifying or configuring the Strata TX system using the Strata TX Configurator software over a local or remote serial data link.

1. Install the Strata Configurator software per instructions supplied with the software. This software is designed to operate properly on Windows 32 bit operating systems, e.g., Windows 98/NT/2000/ or XP operating systems.

2. Connect the PC serial port to the TCU or TXU per Figure 5. above. Apply the appropriate DC power to the Strata TX radio system and operate the front panel power switch(s) to ON.

3. Start the Strata Configurator application. You should see the following main menu appear:

4. Click on the “Connect to Radio” control. The following dialog is presented.

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5. Enter 1 or 2 depending on which PC serial data (RS-232) COM port is being used.

Note: If the Strata TX Configurator application is unable to open a valid serial data port or an invalid

number is entered, you will receive the following error dialog:

If you are unable to open a serial port or establish a valid serial port connection to a Strata TX radio system, exit the application and attempt to determine the difficulty and try again.

6. Assuming a valid serial data connection is established with a Strata TX radio system, you should see the main Customer screen display with all front panel controls activated as shown below.

7. Next use the “Load Settings From Radio” function to retrieve the current Strata TX radio configuration. It is recommended you store this configuration to a file using the “Save Settings to File” function especially when any modifications have been made to the current radio settings.

8. Access the Global, COFDM, MPEG Video, MPEG Audio, FMT and RF Settings menus by clicking on the appropriate menu tabs. The channel frequency settings found in the “Channel Plan” tab are only accessible for systems that do not include the “Frequencies Locked to Presets” option.

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9. Select the correct configuration option or options for the intended application or applications. Please note that some configuration options may not apply depending on specific hardware options supplied and whether a unit being configured is connected to a companion unit, i.e., a TCU connected via a coaxial cable to a companion TXU, etc.

10. Next, use the “Program Radio” function to load the specified changes and settings into the Strata TX radio system. It is strongly recommended that you perform a “Load Settings From Radio” action to verify the desired settings were loaded into the Strata TX radio system.

Note: An active programming or configuration retrieval session requires approximately 2 minutes to complete. Do not disturb the radio system or serial data connections until an indication is received that the current operation has completed.

11. When the Strata system has been properly configured and the front panel monitoring control has been used to verify the desired configurati ons hav e been im plem ented, use the “ Save Sett ings to File ” option and save the current system configurations for future use, either for restoring the current system settings or for applying similar configuration parameters to another system. You may wish to enter a descriptive name for this particular configuration in the Customer screen “Description Information” field in addition to a unique file name to aid in identifying this particular system configuration.

12. When the current Strata TX system configuration action has been completed, remove the serial data connection to the Strata TX system.

13. Test and verify proper operation of the configured Strata system using the front panel controls as described elsewhere in this document.

This completes remote configuration of the Strata TX system.

Note: A limited number of Strata system configuration parameters may be modified using the front panel controls such as selecting pre-configured presets and powering adjacent units, etc. You may also effectively use the front panel controls to monitor proper operation and review current preset configurations, etc.

Basic System Operation

The following basic operational notes are supplied in an effort to ensure the Strata TX system is operating properly.

1. Always ensure you apply the proper DC input power, including a verification of the current handling capacity of the power source. Note that some applications require minimum DC power for proper operation, e.g., the case where a TCU is separated from the TXU over a long length of coaxial cable.

2. Be sure the front panel controls are set properly to supply power to either or both a TCU or HPU unit when DC power is supplied from the TXU. Note that the HPU obtains its DC operating power over the RF coaxial cable from the companion TXU.

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3. When initially powering a Strata TX system, the power/error front panel LED will indicate an error condition (amber) for a few seconds prior to turning green. This is an indication that the Strata TX components have not completed software initialization. You will also note this condition when switching between digital and analog modes. Users will be prevented from operating the Strata transmitter until the front panel power/error LEDs have turned green.

4. You should not attempt to change presets while the transmitter is active. Turn OFF the Strata transmitter (hold front panel control knob in for 1 second) before changing presets. Before activating the transmitter after changing a preset or operating frequency, use the front panel control to ensure the selected operating frequency is the desired frequency.

5. Note that the front panel will not display the transmitter output power when an HPU is present. When using a TXU without the HPU option, the approximate RF output power will displayed on the front panel main menu display.

6. For those applications that require transmitting at lower output power, you may dial in additional IF attenuation (1 to 31 dB) using the front panel control. Note that any additional attenuation applied in this manner will be lost when changing presets or re-powering the system. For permanently installed additional attenuation values associated with a system preset number, you may configure these values using the supplied Strata TX Configurator utility. In this case the amount of additional attenuation will apply when the associated preset is selected but may be temporarily changed using the front panel control. Depending on the operating mode, and the characteristics of the radio components, added IF attenuation may not decrease RF output power on a 1:1 basis. If accurate RF output power setting is required, use an external RF power meter to ensure the desired amount of RF output power is obtained.

7. For those systems configured for Frequency-locked-to-Presets, you may temporarily change the transmitting frequency using the front panel control. Any channelized frequency entered in this manner is temporary and will be lost when changing presets or re-powering the system. For those systems configured for Frequency-unlocked-to-Presets, changing the current operating frequency will remain in effect until changed by the user.

8. Note that Strata TX systems must be configured at the MRC factory for the following options:

• NTSC (default) or PAL composite video formats

• Frequencies-locked-to-Presets (Helicopter opera tion)

• Frequencies-not-lock ed- to-P rese ts (de fau lt option)

• RF band, e.g., 1.9 GHz to 2.5 GHz (default) or 2.3 GHz to 2.7 GHz

These options cannot be changed in the field.

9. Adjustment of FMT audio deviation levels cannot be accomplished in the field. There are no physical controls permitting this adjustment. The FMT audio deviation levels are adjusted with special software tools in the MRC factory for industry standard (+8 dBm input @ 75 kHz deviation) levels unless otherwise specified.

Every effort has been made to supply a state-of-the-art and reliable Strata TX design. Should you encounter any difficulty operating your Strata TX radio system, please contact Microwave Radio Communications for assistance.

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Appendix

External Connection Information

Note: The MRC P/N for the external circular panel audio connector cable assembly is 907471-1. This 3 foot long cable assembly includes the mating Amphenol connector and 4 each female XLR connectors. For customers who wish to construct their own external audio connection cable assembly, the mating Amphenol connector P/N is MS3116F12-10S.

MPEG Board Function Circular Connector Wire Color XLR Analog Audio Input

J11- 1 (return) Right chan 1 A White #1 – pin 3 J11- 2 GND B Black #1 – pin 1 J11- 3 (live) Right chan 1 C Red #1 – pin 2 J11- 4 (return) Left chan 1 D White #2 – pin 3 J11- 5 GND B Black #2 – pin 1 J11- 6 (live) Left chan 1 E Red #2 – pin 2

Analog Audio Input

J12- 1 (return) Right chan 2 F White #3 – pin 3 J12- 2 GND G Black #3 – pin 1 J12- 3 (live) Right chan 2 H Red #3 – pin 2 J12- 4 (return) Left chan 2 J White #4 – pin 3 J12- 5 GND G Black #4 – pin 1 J12- 6 (live) Left chan 2 K Red #4 – pin 2

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Digital Audio Input (AES-EBU) XLR

J13 - 1 – Chan 2+ #1 Pin 3 J13 - 2 – GND #1 Pin 1 J13 - 3 – Chan 2- #1 Pin 2 J13 - 4 – Chan 1+ #2 Pin 3 J13 - 5 – GND #2 Pin 1 J13 - 6 – Chan 1- #2 Pin 2

Total of 4 each audio circuits

Notes:

1. In the case of digital audio connections, note that the GND (ground) connection is common to two audio circuits as opposed to the connections used for standard analog audio circuits. In the case of digital audio circuits then, a single XLR connector supplies two (2) each audio circuits instead of a single audio circuit in the case of standard analog audio connections.

2. Due to the variety of audio connection options available, either of two existing analog audio connections may be connected to J13 (digital audio). The circular panel pin out will change depending on which existing audio connection is used. See below for additional details.

Strata TX Digital and Analog Aud io Options

Introduction

Due to the unique design of the Strata TX digital encoder circuit, a number of digital and analog audio input options may be accommodated. This brief memorandum describes the provisioning and use of these audio circuits.

Digital Encoder Audio Options

The current Strata TX system supports the following MPEG encoder audio input signals:

• Analog audio

• AES-EBU digital audio

• SDI Embedded digital audio

Note: SDI embedded digital audio is “embedded” within the SDI digital signal when the SDI video option is employed, i.e., an SDI video + audio signal is connected to the TCU or TXU “Signal Input” BNC connector. In this case the digital audio signals are not connected to the encoder via the circular panel audio connector.

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Analog Audio Options

Up to 4 individual analog audio input signals may be transported over the COFDM transport signal. This accommodates the industry standard Channel 1 and Channel 2, Left and Right side audio circuits. Two on-board 6 pin audio connectors are wired to the Strata TX circular panel audio connectors for connection to customer supplied audio sources.

Note: Where an FMT is installed in a Strata TCU housing (digital + analog transmission), analog audio input signals may be bridged to one or both FMT audio inputs in addition to being connected to the MPEG encoder analog audio inputs. This option accommodates simultaneously distributing analog audio input signals to both FMT (analog) and MPEG encoder (digital) modules. The current Strata TX design handles impedance matching in the FMT module by terminating (FMT only) or bridging (FMT + MPEG encoder) audio input signals connected to the FMT module.

Depending on whether one or two analog audio channels are required for analog and/or digital mode operation, one or both audio input channels (two audio circuits per channel), all combinations of analog audio only operation can be accommodated by distributing the audio input signals to either or both FMT and MPEG encoder modules. See the sketch on the following page to view these options.

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Chan 2

Audio

Bridging Connectors

Chan 1

Audio

COFDM /MPE G En coder

FMT

Channel 1, 2 Audio Inputs

Connecting Analog Audio Input Signals to both FMT and MPEG Encoder Modules

Notes:

1. One or both analog audio input signals may be connected to an FMT module, an MPEG encoder module, or both.

2. When connecting analog audio input signals to both FMT and MPEG encoder modules, the FMT audio input circuit is optioned to “bridge” one or both audio channels to accommodate bridged connections to a co-located MPEG encoder module.

3. Analog audio input signals may be split between FMT and MPEG encoder modules by directly connecting one channel to each module.

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4. Any combination of one or two analog audio inputs to either or both FMT or MPEG encoder audio inputs is supported.

Digital Audio Options

The MPEG encoder digital audio on-board connector supports up to four each separate digital audio inputs. Currently the AES-EBU digital audio format is supported.

Note: Since digital audio connections, unlike analog audio connections, share a common ground connection between two audio circuits, digital audio wiring connections are able to accommodate twice the number of audio circuits over the same number of connecting wires (leads). Please refer to the MPEG encoder wiring pinout connections shown below for the differences between analog and digital wiring connections.

MRC 907386-1 COFDM/MPEG Encoder PWB

Analog

Digital Audio (J13)

Channel 1 (J11)

Analog

Channel 2 (J12)

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Analog Audio (Ch1) J11 1 – R-

Analog Audio (Ch2) J12 1 – R-

Digital Audio (Ch1 + Ch2) J13 1 – Ch2+

2 – GND 3 – R+ 4 – L5 – GND 6 – L+

2 – GND 3 – Ch24 – Ch1+ 5 – GND 6 – Ch1-

Summary of Digital and Analog Audio Connection Options

As can be seen from the description above, a total of four each analog audio and four each digital audio channels are supported. However, due to the limited number of pin connections on the circular panel connector, use of digital audio requires audio connection wiring for one analog audio channel. Therefore, whenever one of the circular panel audio connections is connected to the MPEG encoder digital audio input, only one analog channel may be connected to either or both FMT and MPEG encoder modules.

The various audio connection options are summarized in the table below:

Analog Audio Digital Audio Number of Channels Option

X 2 FMT and/or MPEG X 4 FMT and/or MPEG

X 4 MPEG only

X X 2 analog + 4 digital FMT and MPEG

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Strata Power Cables

TXU and TCU

These units use a KPT06F12-8S 8-pin female cable-mount power connector (

MRC P/N = 52155-37). Pins

A, B and C are the Positive (+) voltage input connection. Pins D, E and F are the Negative (–) voltage connection. The current drain for these units at 28 volts DC is approximately 1 ampere each. Please see the power cable-connector pin-out sketch below for connection details.

+12 to +48 volts DC

Common (-) return

Strata TCU/TXU Power Cable Connector Pin-out (End View)

HPU

The HPU device is powered via the center conductor of the coaxial cable connection to the companion TXU (early version). The current drain for this unit at 28 volts DC is approximately 3 amperes when the transmitter is activated.

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TCU Board Inter-connection Diagram

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TXU Board Inter-connection Diagram

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SDIo

J1 J4 J7 J9 J6 J3 J10

SIo MPEG CV FMT CV IF FMT

J11

IF COFDM

OOK ASI

OUT

FL1

Low Pass Filter

907346 Baseband Combine

J5 J2 J8

COAX IN

MONITOR COAX OUT

RS-232 Data

Ch 2 Analog Audio

Ch 1 Analog Audio

Digital Audio

J12

J11

J13

907386

COFDM/MPEG

Encoder

SI x 2

IF Out Audio 3 Audio 1

udio 3, 4

udio 1, 2

TP3

udio 1, 2

D_VID

Audio 3, 4

IF_ON

Video In

C_VID

Audio 4 Audio 2

TCU Video and IF Coaxial Cable Interconnection Details

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Strata TX Front Panel Error Code List

Rotating the front panel TCU or TXU control knob allows access to displayed error codes whenever the unit PWR LED color changes from green to amber. The list below references trouble conditions with displayed error codes.

Error Codes

TXU IF FAULT E020 TXU RF FAULT E021

TXU PS 48 VOLT LINE E030 TXU PS 5.5 VOLT LINE E031 TXU PS 7 VOLT LINE E032 TXU PS 11 VOLT LINE E033 TXU PS TEMPERATURE E034 TXU PS IF COAX CURRENT E035 TXU PS IF COAX VOLTAGE E036 TXU PS IF COAX WATTAGE E037 TXU PS RF COAX CURRENT E038 TXU PS RF COAX VOLTAGE E039 TXU PS RF COAX WATTAGE EP3A TXU PS CKT CURRENT EP3B TXU PS CKT VOLTAGE E0EC TXU PS CKT WATTAGE E03D TXU PS DC BUS E03E

TCU PS 48 VOLT LINE E040 TCU PS 5.5 VOLT LINE E041 TCU PS TEMPERATURE E042 TCU PS COAX CURRENT E043 TCU PS COAX VOLTAGE E044 TCU PS COAX WATTAGE E045 TCU PS CKT CURRENT 3046 TCU PSCKT VOLTAGE E047 TCU PS CKT WATTAGE E048 TCU PS DC BUS E049

MID

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HPU PS 48 VOLT LINE E060 HPU PS 5.5 VOLT LINE E061 HPU PS 11 VOLT LINE E062 HPU PS TEMPERATURE E063 HPU PS COAX CURRENT E064 HPU PS COAX VOLT E065 HPU PS COAX WATTAGE E066 HPU PS CKT CURRENT E067 HPU PS CKT VOLTAGE E068 HPU PS CKT WATTAGE E069 HPU PS DC BUS E06A

COFDM ENCODER COMM ERROR E080

FMT VIDEO PLL UNLOCK E0E0 FMT AUDIO1 PLL UNLOCK E0E1 FMT AUDIO2 PLL UNLOCK E0E2 FMT AUDIO3 PLL UNLOCK E0E3 FMT AUDIO4 PLL UNLOCK E0E4

SYSTEM_ERROR_SUMMARY E400

Note: While the above front panel error codes indicate that portion of the system most likely affected, please contact MRC Technical Support for assistance should troubleshooting your Strata TX system become necessary.

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Strata Transmitter Wayside Data Channel Access

MRC 907386-1 COFDM/MPEG Encoder PWB Layout

J12

Note:

For Wayside data channel access, use analog audio channel 2 cable assembly (J12). Audio pins F, G and H in the audio circular panel connector (corresponding to J12 pins 1, 2 and 3) are connected to J7 pins 1, 2 and 3 per the pinout information shown below

. Note that analog audio channel 2 Right Side

channel connections are removed and not available when the Wayside data channel option is used.

RS232 Wayside Data J7 1 – RS232TX (from encoder)

2 – RS232RX (to encoder) 3 – GND

Top View of 907386 COFDM/MPEG Encoder PWB

7 12 3

J12

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COFDM/MPEG Encoder PWB Connections

NAME PCB

DESIGNATION

Expansion Port Header

DSP debug header

Power Connector and 2-wire control interface

ISP Connector for Atmel Processor

70MHz IF Output

J1 Details available on request

J2 Engineering Use Only

J3 Pin 1 - TXD (from encoder)

J4 Pin 1 - 5V

J5 50 Ohm

COMMENTS

Pin 2 - RXD (to encoder) Pins 3,4,5,6 - GND Pins 7,8,9,10 - +5.5V

Pin 2 - SDOUT Pin 3 - GND Pin 4 - RESET Pin 5 - SCLK Pin 6 - SDIN

Composite Video Input

RS232 Data and RS485 Control J 7

SDI Input J8 75 Ohm ASI out J9, J10 75 Ohm Analog Audio (Ch1) J11 1 – R-

Analog Audio (Ch2) J12

Digital Audio (Ch1 + Ch2) J13 1 – Ch2+

LED – Amber IF_ON Indicates IF Output is ON LED – Green C_VID Indicates lock ed to i nput composi te video LED – Green D_VID Indicates lock ed to i nput SDI vi deo LED - Amber HLTH Heartbeat – flashing indicates software running

J6 Terminated at 75 Ohm

1 – RS232TX (from encoder) 2 – RS232RX (to encoder) 3 – GND

4 – RS485 TX 5 – RS485 TX 6 – RS485 RX 7 – RS485 RX

2 – GND 3 – R+ 4 – L5 – GND 6 – L+

1 – R- 2 – GND 3 – R+

4 – L5 – GND 6 – L+

2 – GND 3 – Ch24 – Ch1+ 5 – GND 6 – Ch1-

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Note: The transmit data connection lead (TD) is used to support serial data flow control

communications between the encoder circuit and a connecting data terminal (PC). Most applications do not use this capability .

RD SG

J7 *

1 2 3

Wayside Data Traffic

DB-9

Null Modem Cable

3 2 5

DB-9

3 2

Encoder PWB

Circular Panel Audio

Connector

* Note: J7 pin 1 is nearest to long edge of COFDM/MPEG PWB

DTE

End of Strata TX Operations Guide Document

DTE

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Microwave Radio Communications STATXU2D Users Manual

Specifications and Main Features

Frequently Asked Questions

User Manual