Crown FM30, FM150, FM300 User Manual

FM30/FM150/FM300 Broadcast Transmitter

User's Manual

©2007 Crown Broadcast, a division of

International Radio and Electronics Corporation

25166 Leer Drive, Elkhart, Indiana, 46514-5425 U.S.A. [phone]

Revision Control

Revision Print Date

Initial Release March 2007

Important Notices

©2007, Crown Broadcast, a division of International Radio and Electronics Corporation.
Portions of this document were originally copyrighted by Michael P. Axman in 1994.

All rights reserved. No part of this publication may be reproduced, transmitted, transcribed,
stored in a retrieval system, or translated into any language in any form by any means
without the written permission of International Radio and Electronics, Inc.
Printed in U.S.A.

Crown Broadcast attempts to provide information that is accurate, complete, and useful.
Should you find inadequacies in the text, please send your comments to the following
address:

International Radio and Electronics Corporation

P.O. Box 2000

Elkhart, Indiana, 46515-2000 U.S.A.

ii

Contents

Section 1– Getting Acquainted 1-1

1.1 Your Transmitter 1-2

1.2 Applications and Options 1-3

1.2.1 Stand Alone 1-4

1.2.2 Backup 1-4

1.2.3 Booster 1-4

1.2.4 Exciter 1-4

1.2.5 Translator 1-5

1.2.6 Satellator 1-6

1.2.7 Nearcasting 1-6

1.3 Transmitter/Exciter Specifications 1-7

1.4 Receiver Specifications 1-9

1.5 Safety Considerations 1-10

1.5.1 Dangers 1-10

1.5.2 Warnings 1-10

1.5.3 Cautions 1-10

Section 2– Installation 2-1

2.1 Operating Environment 2-2

2.2 Power Connections 2-2

2.2.1 AC Line Voltage Setting 2-2

2.2.2 Fuses 2-5

2.2.3 Battery Power 2-5

2.3 Frequency (Channel) Selection 2-5

2.3.1 Modulation Compensator 2-7

2.4 Receiver Frequency Selection 2-7

2.5 RF Connections 2-10

2.6 Audio Input Connections 2-11

2.7 SCA Input Connections 2-12

2.8 Composite Input Connection 2-12

2.9 Audio Monitor Connections 2-13

2.10 Pre-emphasis Selection 2-13

2.11 Program Input Fault Time-out 2-14

2.12 Remote I/O Connector 2-14

iii

Section 3-Operation 3-1

3.1 Initial Power-up Procedures 3-2

3.2 Power Switches 3-4

3.2.1 DC Breaker 3-4

3.2.2 Power Switch 3-4

3.2.3 Carrier Switch 3-4

3.3 Front Panel Bar-Dot Displays 3-5

3.3.1 Audio Processor Input 3-5

3.3.2 Highband and Wideband Display 3-5

3.3.3 Modulation Display 3-5

3.4 Input Gain Switches 3-6

3.5 Processing Control 3-6

3.6 Stereo-Mono Switch 3-6

3.7 RF Output Control 3-7

3.8 Digital Multimeter 3-7

3.9 Fault Indicators 3-8

Section 4-Principals of Operation 4-1

4.1 Part Numbering 4-2

4.2 Audio Processor Circuit 4-3

4.3 Stereo Generator Circuit 4-4

4.4 RF Exciter Circuit Board 4-6

4.5 Metering Circuit Board 4-8

4.6 Motherboard 4-9

4.7 Display Circuit Board 4-10

4.8 Voltage Regulator Circuit Board 4-11

4.9 Power Regulator Circuit Board 4-12

4.10 RF Driver/Amplifier (FM30) 4-12

4.11 RF Driver (FM150/FM300) 4-13

4.12 RF Amplifier (FM150/FM300 4-13

4.13 Chassis 4-14

4.14 RF Output Filter & Reflectometer 4-14

4.15 Receiver Circuit Board Option 4-15

iv

Section 5-Adjustments and Tests 5-1

5.1 Audio Processor Adjustments 5-2

5.1.1 Pre-Emphasis Selection 5-2

5.1.2 Pre-Emphasis Adjustment 5-2

5.2 Stereo Generator Adjustments 5-2

5.2.1 Separation 5-2

5.2.2 Composite Output 5-2
Using a Modulation Monitor 5-3

5.2.3 19kHz Level 5-4

5.2.4 19kHz Phase 5-4

5.3 Frequency Synthesizer Adjustments 5-4

5.3.1 Frequency (Channel) Selection 5-4

5.3.2 Modulation Compensator 5-4

5.3.3 Frequency Measurement and Adjustment 5-4

5.3.4 FSK Balance Control 5-5

5.4 Metering Board Adjustments 5-5

5.4.1 Power Calibrate 5-5

5.4.2 Power Set 5-5

5.4.3 SWR Calibrate 5-5

5.4.4 PA Current Limit 5-6

5.5 Motherboard Adjustments 5-6

5.6 Display Modulation Calibration 5-6

5.7 Voltage Regulator Adjustment 5-6

5.8 Bias Set (RF Power Amplifier) 5-7

5.9 Performance Verification 5-7

5.9.1 Audio Proof of Performance Measurements 5-7

5.9.2 De-Emphasis Input Network 5-7

5.10 Carrier Frequency 5-8

5.11 Output Power 5-8

5.12 RF Bandwidth and RF Harmonics 5-8

5.13 Pilot Frequency 5-8

5.14 Audio Frequency Response 5-9

5.15 Audio Distortion 5-9

5.16 Modulation Percentage 5-9

5.17 FM and AM Noise 5-9

5.18 Stereo Separation 5-9

5.19 Crosstalk 5-9

5.19.1 Main Channel Into Sub 5-10

5.19.2 Sub Channel Into Main

5.20 38kHz Subcarrier Suppression 5-10

5.21 Additional Checks 5-10

5-10

v

Section 6-Reference Drawings 6-1

6.1 Views 6-2

6.2 Board Layouts and Schematics 6-4

Section 7-Service and Support 7-1

7.1 Service 7-2

7.2 24-Hour Support 7-2

7.3 Spare Parts 7-2

Transmitter Output Efficiency Appendix-1

Glossary G-1

Index Index-1

vi

Section 1—Getting Acquainted

This section provides a general description of the FM30, FM150, and
FM300 transmitters and introduces you to safety conventions used

within this document. Review this material before installing or operating
the transmitter.

1-1 Getting Acquainted

1.1 Your Transmitter

The FM30, FM150, and FM300 are members of a family of FM stereo broadcast
transmitters. Crown transmitters are known for their integration, ease-of-use, and
reliability.

The integration is most apparent in the standard transmitter configuration which
incorporates audio processing, stereo generation, and RF amplification without
compromised signal quality. A single Crown transmitter can replace several pieces of
equipment in a traditional system.

Ease-of-use is apparent in the user-friendly front panel interface and in the installation
procedure. Simply select your operating frequency (using 5 external switches), add an
audio source, attach an antenna, and connect AC or DC power and you're ready to
broadcast. Of course, the FM series of transmitters also feature more sophisticated
inputs and monitoring connections if needed.

Reliability is a Crown tradition. The first Crown transmitters were designed for rigors of
worldwide and potentially portable use. The modular design, quality components,
engineering approach, and high production standards ensure stable performance.

Remote control and metering of the transmitter are made possible through a built-in I/O
port. For more direct monitoring, the front panel includes a digital multimeter display and
status indicators. Automatic control circuitry provides protection for high VSWR as well
as high current, voltage, and temperature conditions.

Illustration 1-1 FM150 Stereo Broadcast Transmitter

This manual describes the FM30, FM150, and FM300 because all three transmitters
share common design factors. Specific product differences are noted throughout the
manual. In physical appearance, the FM30 differs from the FM150 and FM300 in that it
lacks the power amplifier and cooling fan assembly on the back panel.

1-2 FM30/FM150/FM300 User’s Manual

1.2 Applications and Options

Crown transmitters are designed for versatility in applications. They have been used as
stand-alone and backup transmitters and in booster, translator, satellator, and nearcast
applications. The following discussion describes these applications further.

Model numbers describe the configuration of the product (which has to do with its intended
purpose) and the RF output power which you can expect.

The number portion of each name represents the maximum RF output power. The FM300,
for example, can generate up to 300 watts of RF output power.

Suffix letters describe the configuration. The FM300T, for example, is the standard or
transmitter configuration. Except where specified, this document describes the transmitter
configuration. In this configuration, the product includes the following components
(functions):

• Audio Processor/Stereo Generator

• RF Exciter

• Metering

• Low-Pass filter

Illustration 1–2 Standard (Transmitter) Configuration

1-3 Getting Acquainted

1.2.1 Stand-Alone

In the standard configuration, the FM30, FM150, and FM300 are ideal stand-alone
transmitters. When you add an audio source (monaural, L/R stereo, or composite signal),
an antenna, and AC or DC power, the transmitter becomes a complete FM stereo broadcast
station, capable of serving a community.
As stand-alone transmitters, Crown units often replace multiple pieces of equipment in a
traditional setup (exciter, audio processor, RF amplifier).

1.2.2 Backup

In the standard configuration, Crown transmitters are also used in backup applications.
Should your primary transmitter become disabled, you can continue to broadcast while
repairs take place. In addition, the FM transmitters can replace disabled portions of your
existing system including the exciter, audio processor, or amplifier. Transfer switches on
each side of the existing and backup transmitters make the change-over possible with
minimal downtime.
The DC operation option of the FM30, FM150, and FM300 make them attractive backup
units for those times when AC power is lost.

1.2.3 Exciter

In addition to the standard configuration, the FM30, FM150, and FM300 are available in op­tional configurations to meet a variety of needs.
An "E" suffix, as in the FM30E, for example, represents an exciter-only configuration. In this
configuration, the audio processor and stereo generator boards are replaced with circuitry to
bypass their function. The exciter configurations are the least expensive way to get Crown
quality components into your transmission system.
You might consider the Crown exciter when other portions of your system are performing
satisfactorily and you want to maximize your investment in present equipment.

1-4 FM30/FM150/FM300 User’s Manual

1.2.4 Translator

A receiver configuration (FM150R, for example) replaces the audio processor/stereo gen­erator board with a receiver module. This added feature makes the FM30, FM150, and
FM300 ideal for translator service in terrestrial-fed networks. These networks represent a
popular and effective way to increase your broadcasting coverage. Translators, acting as
repeater emitters, are necessary links in this chain of events.
Traditionally, network engineers have relied on multiple steps and multiple pieces of equip­ment to accomplish the task. Others have integrated the translator function (receiver and
exciter) to feed an amplifier. Crown, on the other hand, starts with an integrated transmitter
and adds a solid-state Receiver Module to form the ideal translator.

Illustration 1–3 Crown's Integrated Translator

This option enables RF in and RF out on any of Crown’s FM series of transmitters. In addi­tion, the module supplies a composite output to the RF exciter portion of the transmitter.
From here, the signal is brought to full power by the built-in power amplifier for retransmis­sion. The Receiver Module has been specifically designed to handle SCA channel output up
to 100 kHz for audio and high-speed data.
FSK ID programming is built-in to ensure compliance with FCC regulations regarding the
on-air identification of translators. Simply specify the call sign of the repeater station when
ordering. Should you need to change the location of the translator, replacement FSK chips
are available. The Receiver Module option should be ordered at the time of initial transmitter
purchase. However, an option kit is available for field converting existing Crown units.
In the translator configuration there are differences in the function of the front panel, see
Section 3 for a description.

1-5 Getting Acquainted

1.2.5 Satellator

One additional option is available for all configurations—an FSK Identifier (FSK IDer). This
added feature enables the FM30, FM150, and FM300 to transmit its call sign or operating
frequency in a Morse code style. This option is intended for use in satellite-fed networks.
Transmitters equipped in this fashion are often known as "satellators."
Connect the transmitter to your satellite receiver and the pre-programmed FSK IDer does
the rest—shifting the frequency to comply with FCC requirements and in a manner that is
unnoticeable to the listener. The FSK IDer module should be ordered at the time you order
your transmitter, but is available separately (factory programmed for your installation).

Illustration 1–4 Transmitter with FSK IDer Option

Add the FSK IDer option to the exciter configuration for the most economical satellator (a
composite input signal is required).

1.2.6 Nearcasting

The output power of an FM30 transmitter can be reduced to a level that could function as a
near-cast transmitter. Crown transmitters have been used in this way for language transla­tion, for re-broadcasting the audio of sporting events within a stadium, and for specialized
local radio. The FM30 is the only transmitter that is appropriate for this application.

1-6 FM30/FM150/FM300 User’s Manual

1.3 Transmitter/Exciter Specifications

Frequency Range 87.9 MHz–107.9 MHz (76 MHz–90 MHz
optionally available)

RF Power Output (VSWR 1.7:1 or better)

FM30 3-33 Watts adjustable

FM150 15-165 Watts adjustable

FM300 30-330 Watts adjustable

RF Output Impedance 50 Ohms

Frequency Stability Meets FCC specifications from 0-50

degrees C

Audio Input Impedance 50k Ω bridging, balanced, or 600 Ω

Audio Input Level Selectable for –10 dBm to +10 dBm for

75 kHz deviation at 400 Hz

Pre-emphasis Selectable for 25, 50, or 75 µsec; or flat

Audio Response Conforms to 75 µsec pre-emphasis

curve as follows:

Complete Transmitter ±0.30 dB (50 Hz–10 kHz)
±1.0 dB (10 kHz–15 kHz)

Exciter only ±0.25 dB (50 Hz–15 kHz)

Distortion (THD + Noise)

Complete Transmitter Less than 0.7% (at 15kHz)

Exciter only Less than 0.3% (50Hz-15kHz)

Stereo Separation

Complete Transmitter Better than –40dB (50Hz-15kHz)

Exciter only Better than –40dB (50Hz-15kHz)

Crosstalk Main into Sub, better than –40dB
Sub into Main, better than –40dB

Stereo Pilot 19 kHz ±2 Hz, 9% modulation

1-7 Getting Acquainted

Subcarrier Suppression 50dB below ±75 kHz deviation

FM S/N Ratio (FM noise)

Complete Transmitter Better than –60dB

Exciter only Better than –70dB

AM S/N Ratio Asynchronous and synchronous noise
better than FCC requirements

RF Bandwidth ±120 kHz, better than –35 dB

±240 kHz, better than –45 dB

RF Spurious Products Better than –70dB

Operating Environment Temperature (0

°C to 50°C)

Humidity (0 to 80% at 20°C)

9834 Feet

Maximum Altitude (3,000 Meters;

AC Power 100,120, 220, or 240 volts +10%/-

15%); 50/60Hz

FM30 115VA

FM150 297VA

FM300 550VA

DC Power

FM30 24-36 volts (36 volts at 3 amps required
for full output power)

FM150 36-72 volts (48 volts @ 7 amps for full
output power)

FM300 36-72 volts (72 volts @ 10 amps for full
output power)

1-8 FM30/FM150/FM300 User’s Manual

Note: We set voltage and ampere requirements to assist you in designing your system. De­pending on your operating frequency, actual requirements for maximum voltage and current
readings are 10–15% lower than stated.

Regulatory Type notified FCC parts 73 and 74
Meets FCC, DOC, and CCIR requirements

Dimensions 13.5 x 41.9 x 44.5 cm

5.25 x 16.5 x 17.5 inches

Weight
FM30 10.5 kg (23 lbs)

13.6 kg (30 lbs) shipping weight

FM150 11.4 kg (25 lbs)

14.5 kg (32 lbs) shipping weight

FM300 16.8 kg (37 lbs)

20.0 kg (44 lbs) shipping weight

1-9 Getting Acquainted

1.4 Receiver Specifications

Monaural Sensitivity (demodulated, de-emphasized)

3.5 µ V for signal-to-noise > 50 dB

Stereo Sensitivity (19–kHz pilot frequency added)
31 µ V for signal-to-noise > 50 dB

Connector
Standard type N, 50 Ω

Shipping Weight

1 lb

1.5 Safety Considerations

Crown Broadcast assumes the responsibility for providing you with a safe product and
safety guidelines during its use. “Safety” means protection to all individuals who install,
operate, and service the transmitter as well as protection of the transmitter itself. To
promote safety, we use standard hazard alert labeling on the product and in this manual.
Follow the associated guidelines to avoid potential hazard.

1.5.1 Dangers

DANGER represents the most severe hazard alert. Extreme bodily harm or death will occur
if DANGER guidelines are not followed.

1.5.2 Warnings

WARNING represents hazards which could result in severe injury or death.

1.5.3 Cautions

CAUTION indicates potential personal injury, or equipment or property damage if the asso­ciated guidelines are not followed. Particular cautions in this text also indicate unauthorized
radio-frequency operation.

Illustration 1–5 Sample Hazard Alert

1-10 FM30/FM150/FM300 User’s Manual

Section 2—Installation

This section provides important guidelines for installing your transmitter.

Review this information carefully for proper installation.

2-1 Installation

2.1 Operating Environment

You can install the FM transmitter in a standard component rack or on a suitable surface
such as a bench or desk. In any case, the area should be as clean and well ventilated as
possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you set
the transmitter on a flat surface, install spacers on the bottom cover plate. If you install the
transmitter in a rack, provide adequate clearance above and below. Do not locate the trans­mitter directly above a hot piece of equipment.

2.2 Power Connections

The FM30, FM150, and FM300 operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; sin­gle phase). Each transmitter can operate on DC power as well (28 volts for the FM30, 48
volts for the FM150, and 72 volts for the FM300). The transmitter can operate on fewer volts
DC, but with reduced RF output power (see section 1.3). In addition, the transmitter isolates
the AC and DC sources; both can be connected at the same time to provide battery backup
in the event of an AC power failure.

2.2.1 AC Line Voltage Setting

To change the voltage setting, follow these steps:

1. Disconnect the power cord if it is attached.

2. Open the cover of the power connector assembly using a small, flat blade screw
driver. See Illustration 2–1.

3. Insert the screwdriver into the voltage selection slot and remove the drum from the as­sembly.

4. Rotate the drum to select the desired voltage. See Illustration 2–2.

5. Replace the drum and cover and check to see that the correct voltage appears in the
connector window.

6. Connect the AC power cord.

2-2 FM30/FM150/FM300 User’s Manual

Illustration 2–1 Removing the Power Connector Cover

Illustration 2–2 Selecting an AC Line Voltage

2-3 Installation

2.2.2 Fuses

The fuse holders are located in the power connector assembly just below the voltage selec­tor.

Illustration 2–3 Fuse Holder

For 100 to 120 VAC operation, use the fuse installed at the factory. For 220 to 240 VAC op­eration, use the slow-blow fuse located in a hardware kit within the transmitter packaging.
Consult the following table:

Transmitter Input Power Fuse

FM30 100–120 V 3 A

220–240 V 1.5 A

FM150 100–120 V 6.3 A

220–240 V 4 A

FM300 100–120 V 12.5 A

220–240 V 6.3 A

Illustration 2–4 Fuse Reference Table

2-4 FM30/FM150/FM300 User’s Manual

2.2.3 Battery Power

Your transmitter can operate on a DC power source (such as 4 or 5, 12–volt deep cycle bat­teries connected in series). The FM30 requires 28 volts DC for full output power, while the
FM150 requires 48 volts, and FM300 requires 72 volts for full output power. Connect the
batteries to the red (+) and black (–) battery input binding posts on the rear panel.

2–5 Illustration DC Input Terminals

2.3 Frequency (Channel) Selection

Your transmitter is capable of operating between 87.9 and 107.9 MHz in the FM band. The
transmitter can also operate between 76 and 90 MHz by shorting pins 9 and 10 of J20 on

the motherboard. (See illustration 2-6)

To adjust the operating frequency, follow these steps:

1. Locate the frequency selector switches on the front panel which will be used to change
the setting. See Illustrations 2–6 and 2–7.

2-5 Installation

2. Use small flat blade screwdriver or another suitable device to rotate the switches to the
desired setting. (The selected number will appear directly above the white indicator dot
on each switch.) See examples of selected frequencies in the illustration below.

3. To change the operating band from 87.9-107.9MHz to 76-90MHz or vice versa, or to ad­just the modulation compensation pot, remove the top cover to gain access to these fea­tures. See illustrations 2-6 and 2-10.

Illustration 2–6 Top Cover Removed

Megahertz .1

.01

Illustration 2–7 Transmitter Front Panel (Frequency Selector Switches)

= 88.10 MHz

= 107.90 MHz

Illustration 2–8 Two Sample Frequency Selections

2-6 FM30/FM150/FM300 User’s Manual

2.3.1 Modulation Compensator

The Modulation trim-potentiometer (see illustration 2–10) compensates for slight variations
in deviation sensitivity with frequency. Set the trim-pot dial according to the following graph:

Frequency of Operation (MHz)

108 0
106 10
104 15
102 25
100 35

98 40

97.1 45
96 55
94 60
92 70
90 75
88 80
86 80
84 80

82.4 70
82 65
80 55
78 30
76 0

Modulation Compensation Pot Setting

Illustration 2–9 Modulation Compensator Settings

These compensator settings are approximate. Each mark on the potentiometer represents
about 1.8% modulation compensation.

Illustration 2–10 Modulation Compensator Pot

2-7 Installation

2.4 Receiver Frequency Selection

If you have a transmitter equipped with the receiver option, you will need to set the receiving
or incoming frequency.

1. With the top cover removed, locate the receiver module and the two switches (labeled
SW1 and SW2).

Illustration 2–11 Receiver Module Switches

2. Use the adjacent chart to set the switches for the desired incoming frequency.

3. For frequencies in the Japan FM band, short pins 7&8 on J1 on the receiver card.

4. For 75us pre-emphasis short pins 3&4 and 5&6 on J2 of the Receiver card.

5. For 50us pre-emphasis short pins 1&2 and 7&8 on J2 of the Receiver card.

6. After setting the frequency, replace the top cover and screws.

2-8 FM30/FM150/FM300 User’s Manual

Freq. 74-90

MHz

Freq. 88-108

MHz

SW1 SW2 Freq. 74-90

MHz

Freq. 88-108

MHz

SW1 SW2

74.9 87.9 0 0 78.9 91.9 1 4

75.0 88.0 8 0 79.0 92.0 9 4

75.1 88.1 0 1 79.1 92.1 1 5

75.2 88.2 8 1 79.2 92.2 9 5

75.3 88.3 0 2 79.3 92.3 1 6

75.4 88.4 8 2 79.4 92.4 9 6

75.5 88.5 0 3 79.5 92.5 1 7

75.6 88.6 8 3 79.6 92.6 9 7

75.7 88.7 0 4 79.7 92.7 1 8

75.8 88.8 8 4 79.8 92.8 9 8

75.9 88.9 0 5 79.9 92.9 1 9

76.0 89.0 8 5 80.0 93.0 9 9

76.1 89.1 0 6 80.1 93.1 1 A

76.2 89.2 8 6 80.2 93.2 9 A

76.3 89.3 0 7 80.3 93.3 1 B

76.4 89.4 8 7 80.4 93.4 9 B

76.5 89.5 0 8 80.5 93.5 1 C

76.6 89.6 8 8 80.6 93.6 9 C

76.7 89.7 0 9 80.7 93.7 1 D

76.8 89.8 8 9 80.8 93.8 9 D

76.9 89.9 0 A 80.9 93.9 1 E

77.0 90.0 8 A 81.0 94.0 9 E

77.1 90.1 0 B 81.1 94.1 1 F

77.2 90.2 8 B 81.2 94.2 9 F

77.3 90.3 0 C 81.3 94.3 2 0

77.4 90.4 8 C 81.4 94.4 A 0

77.5 90.5 0 D 81.5 94.5 2 1

77.6 90.6 8 D 81.6 94.6 A 1

77.7 90.7 0 E 81.7 94.7 2 2

77.8 90.8 8 E 81.8 94.8 A 2

77.9 90.9 0 F 81.9 94.9 2 3

78.0 91.0 8 F 82.0 95.0 A 3

78.1 91.1 1 0 82.1 95.1 2 4

78.2 91.2 9 0 82.2 95.2 A 4

78.3 91.3 1 1 82.3 95.3 2 5

78.4 91.4 9 1 82.4 95.4 A 5

78.5 91.5 1 2 82.5 95.5 2 6

78.6 91.6 9 2 82.6 95.6 A 6

78.7 91.7 1 3 82.7 95.7 2 7

78.8 91.8 9 3 82.8 95.8 A 7

Illustration 2–12-1 Receiver Frequency Selection

(Continued on next page)

2-9 Installation

Freq. 74-90

MHz

Freq. 88-108

MHz

SW1 SW2 Freq. 74-90

MHz

Freq. 88-108

MHz

SW1 SW2

82.9 95.9 2 8 86.6 99.6 B A

83.0 96.0 A 8 86.7 99.7 3 B

83.1 96.1 2 9 86.8 99.8 B B

83.2 96.2 A 9 86.9 99.9 3 C

83.3 96.3 2 A 87.0 100.0 B C

83.4 96.4 A A 87.1 100.1 3 D

83.5 96.5 2 B 87.2 100.2 B D

83.6 96.6 A B 87.3 100.3 3 E

83.7 96.7 2 C 87.4 100.4 B E

83.8 96.8 A C 87.5 100.5 3 F

83.9 96.9 2 D 87.6 100.6 B F

84.0 97.0 A D 87.7 100.7 4 0

84.1 97.1 2 E 87.8 100.8 C 0

84.2 97.2 A E 87.9 100.9 4 1

84.3 97.3 2 F 88.0 101.0 C 1

84.4 97.4 A F 88.1 101.1 4 2

84.5 97.5 3 0 88.2 101.2 C 2

84.6 97.6 B 0 88.3 101.3 4 3

84.7 97.7 3 1 88.4 101.4 C 3

84.8 97.8 B 1 88.5 101.5 4 4

84.9 97.9 3 2 88.6 101.6 C 4

85.0 98.0 B 2 88.7 101.7 4 5

85.1 98.1 3 3 88.8 101.8 C 5

85.2 98.2 B 3 88.9 101.9 4 6

85.3 98.3 3 4 89.0 102.0 C 6

85.4 98.4 B 4 89.1 102.1 4 7

85.5 98.5 3 5 89.2 102.2 C 7

85.6 98.6 B 5 89.3 102.3 4 8

85.7 98.7 3 6 89.4 102.4 C 8

85.8 98.8 B 6 89.5 102.5 4 9

85.9 98.9 3 7 89.6 102.6 C 9

86.0 99.0 B 7 89.7 102.7 4 A

86.1 99.1 3 8 89.8 102.8 C A

86.2 99.2 B 8 89.9 102.9 4 B

86.3 99.3 3 9 90.0 103.0 C B

86.4 99.4 B 9 X 103.1 4 C

86.5 99.5 3 A X 103.2 C C

Illustration 2–12-2 Receiver Frequency Selection

2-10 FM30/FM150/FM300 User’s Manual

(Continued on next page)

Freq. 74-90

MHz

Freq. 88-108

MHz

SW1 SW2 Freq. 74-90

MHz

Freq. 88-108

MHz

SW1 SW2

X 103.3 4 D X 107.0 D F
X 103.4 C D X 107.1 6 0
X 103.5 4 E X 107.2 E 0
X 103.6 C E X 107.3 6 1
X 103.7 4 F X 107.4 E 1
X 103.8 C F X 107.5 6 2
X 103.9 5 0 X 107.6 E 2
X 104.0 D 0 X 107.7 6 3
X 104.1 5 1 X 107.8 E 3
X 104.2 D 1 X 107.9 6 4
X 104.3 5 2 X 108.0 E 4
X 104.4 D 2
X 104.5 5 3
X 104.6 D 3
X 104.7 5 4
X 104.8 D 4
X 104.9 5 5
X 105.0 D 5
X 105.1 5 6
X 105.2 D 6
X 105.3 5 7
X 105.4 D 7
X 105.5 5 8
X 105.6 D 8
X 105.7 5 9
X 105.8 D 9
X 105.9 5 A
X 106.0 D A
X 106.1 5 B
X 106.2 D B
X 106.3 5 C
X 106.4 D C
X 106.5 5 D
X 106.6 D D
X 106.7 5 E
X 106.8 D E
X 106.9 5 F

Illustration 2–12-3 Receiver Frequency Selection

2-11 Installation

2.5 RF Connections

Connect the RF load, an antenna or the input of an external power amplifier, to the type-N,
RF output connector on the rear panel. VSWR should be 1.5:1 or better.

The RF monitor is intended primarily for a modulation monitor connection. Information
gained through this connection can supplement that which is available on the transmitter
front panel displays.
If your transmitter is equipped with the receiver option, connect the incoming RF to the RF
IN connector.

2-12 FM30/FM150/FM300 User’s Manual

Illustration 2–13 RF Connections

2.6 Audio Input Connections

Attach audio inputs to the Left and Right XLR connectors on the rear panel. (The Left
channel audio is used on Mono.) Pin 1 of the XLR connector goes to chassis ground. Pins 2
and 3 represent a balanced differential input with an impedance of about 50 kΩ . They may
be connected to balanced or unbalanced left and right program sources.
The audio input cables should be shielded pairs, whether the source is balanced or unbal­anced. For an unbalanced program source, one line (preferably the one connecting to pin 3)
should be grounded to the shield at the source. Audio will then connect to the line going to
pin 2.

Illustration 2–14 XLR Audio Input Connectors

By bringing the audio return line back to the program source, the balanced differential input
of the transmitter is used to best advantage to minimize noise. This practice is especially
helpful if the program lines are fairly long, but is a good practice for any distance.
If the program source requires a 600 Ω termination, see the motherboard configuration chart
on page 4-9 for the proper configuration of the jumpers.

2-13 Installation

2.7 SCA Input Connections

You can connect external SCA generators to the SCA In connectors (BNC-type) on the rear
panel. The inputs are intended for the 60 kHz to 99 kHz range, but a lower frequency may
be used if the transmitter is operated in Mono mode. (The 23 to 53 kHz band is used for ste­reo transmission.) For 7.5 kHz deviation (10% modulation), input of approximately 3.5–volts
(peak-to-peak) is required.

Illustration 2–15 SCA Input Connectors

2.8 Composite Input Connection

You may feed composite stereo (or mono audio) directly to the RF exciter bypassing the in­ternal audio processor and stereo generator. To use the Crown transmitter as an RF Exciter
only ("E" version or when using the "T" version with composite input), it is necessary to use
the Composite Input section of the transmitter. This will feed composite stereo (or mono au­dio) directly to the RF exciter. In the "T" version, this will bypass the internal audio proces­sor and stereo generator.

Input sensitivity is approximately 3.5–volt P-P for 75 kHz deviation.

1. Enable the Composite Input by grounding pin 14 of the Remote I/O connector

(see Illustration 2–18).

2. Connect the composite signal using the Composite In BNC connector.

2-14 FM30/FM150/FM300 User’s Manual

Illustration 2–16 Composite In and Audio Monitor Connections

2.9 Audio Monitor Connections

Processed, de-emphasized samples of the left and right audio inputs to the stereo genera­tor are available at the Monitor jacks on the rear panel. The signals are suitable for feeding
a studio monitor and for doing audio testing. De-emphasis is normally set for 75 µsec; set to
50 µsec by moving jumpers, HD201 and HD202, on the Audio Processor/Stereo Generator
board.

2.10 Pre-emphasis Selection

Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appro­priate pins of header HD1 on the Audio Processor/Stereo Generator board. If you change
the pre-emphasis, change the de-emphasis jumpers HD201 and HD202 on the Audio Proc­essor/Stereo Generator board to match.

2-15 Installation

2.11 Program Input Fault Time-out

You can enable an automatic turn-off of the carrier in the event of program failure. To en­able this option, see illustration 2-18 on page 2-16. The time between program failure and
carrier turn-off is set by a jumper (JP1) on the voltage regulator board (see page 6–14 for
board location). Jumper pins 1 and 2 (the two pins closest to the edge of the board) for a
delay of approximately 30 seconds; pins 3 and 4 for a 2–minute delay; pins 5 and 6 for a 4–
minute delay, and pins 7 and 8 for an 8– minute delay.

2.12 Remote I/O Connector

Remote control and remote metering of the transmitter is made possible through a 25–pin,
D-sub connector on the rear panel. (No connections are required for normal operation.)

Illustration 2–17 Remote I/O Connector

Illustration 2–18 Remote I/O Connector (DB-25 Female)

2-16 FM30/FM150/FM300 User’s Manual

Pin Number Function

1. Ground

2. FMV Control

3. Composite Out (sample of stereo generator output)

4. FSK In (Normally high; pull low to shift carrier frequency ap-
proximately 7.5 KHz. Connect to open collector or relay contacts
of user-supplied FSK keyer.)

5. /Auto Carrier Off (Pull low to enable automatic turnoff of carrier
with program failure.)

6. Meter Battery (Unregulated DC voltage; 5 VDC=50 VDC)

7. Meter RF Watts (1 VDC = 100 Watts)

8. Meter PA Volts (5 VDC = 50VDC)

9. Remote Raise (A momentary switch, holding this pin low will slowly raise the RF output)

10. Remote Lower (A momentary switch, holding this pin low will slowly lower the RF output)

11. Remote SWR (A buffered metering output with a calculated reading of standing wave ratio in
VDC.)

12. External ALC Control

13. No Connection

14. /Ext. Enable (Pull low to disable the internal stereo generator and enable External Composite
Input.)

15. 38 KHz Out (From stereo generator for power supply synchronization. For transmitter

equipped with receiver option, this pin becomes the right audio output for an 8-
ohm monitor speaker. 38 KHz is disabled.)

16. ALC

17. /Carrier Off ( Pull low to turn carrier off)

18. Fault Summary ( line goes high if any fault light is activated.)

19. Meter PA Temperature (5 VDC=100 degrees C.)

20. Meter PA Current (1VDC=10 DC Amperes.)

21. Front Panel Voltmeter Input.

22. No Connection.

23.

24. RDS TX

25. Ground

RDS RX

2-17 Installation

Notes:

2-18 FM30/FM150/FM300 User’s Manual

Section 3—Operation

This section provides general operating parameters of your transmitter
and a detailed description of its front panel display.

3-1 Operation

3.1 Initial Power-up Procedures

These steps summarize the operating procedures you should use for the initial operation of
the transmitter. More detailed information follows.

1. Turn on the DC breaker.

Illustration 3–1 DC Breaker

2. Turn on the main power switch.

Main Power
Switch

Illustration 3–2 Front Panel Power Switch

3-2 FM30/FM150/FM300 User’s Manual

3. Verify the following:

A. The bottom cooling fan runs continuously.

B. The Lock Fault indicator flashes for approximately 5 seconds, then goes off.

4. Set the Input Gain switches for mid-scale wideband gain reduction on an average
program level (see section 3.4).

5. Set the Processing control (see section 3.5; normal setting is “50”).

6. Set the Stereo-Mono switch to Stereo (see section 3.6).

7. Turn on the Carrier switch.

8. Check the following parameters on the front panel multimeter:

A. RF Power should be 29–33 watts for the FM30, 145–165 watts for the FM150, and

300–330 watts for the FM300.

B. SWR should be less than 1.1. (A reading greater than 1.25 indicates an antenna

mismatch.

C. ALC should be between 4.00 and 6.00 volts.

D. PA DC Volts should be 26–30 volts for the FM30, 25–35 volts for the FM150, and

37–52 volts for the FM300. (Varies with antenna match, power, and frequency.)

E. PA DC Amperes should be 1.5–2.5 amps for the FM30, 5.5–7.5 amps for the

FM150, and 7.0–9.0 amps for the FM300. (Varies with antenna match, power, and
frequency.)

F. PA Temperature should initially read 20–35 degrees C (room temperature). After

one hour the reading should be 35–50 degrees C.

G. Supply DC Volts should display a typical reading of 45 V with the carrier on and 50 V

with the carrier off for both the FM30 and FM150 products. For the FM300, the

readings should be 65 V with the carrier on and 75 V with carrier off.

H. Voltmeter should be reading 0.0.

The remainder of this section describes the functions of the front panel indicators
and switches.

3-3 Operation

3.2 Power Switches

3.2.1 DC Breaker

The DC breaker, on the rear panel, must be on (up) for transmitter operation, even when
using AC power. Electrically, the DC breaker is located immediately after diodes which iso­late the DC and AC power supplies.

3.2.2 Power Switch

The main on/off power switch controls both the 120/240 VAC and the DC battery power in­put.

3.2.3 Carrier Switch

This switch controls power to the RF amplifiers and supplies a logic high to the voltage
regulator board, which enables the supply for the RF driver. In addition, the Carrier Switch
controls the operating voltage needed by the switching power regulator.
A "Lock Fault" or a low pin 17 (/Carrier Off) on the Remote I/O connector will hold the carrier
off. (See section 2.12.)

Illustration 3–3 Front Panel Carrier Switch

Carrier Switch

3-4 FM50/FM150/FM300 User’s Manual

3.3 Front Panel Bar-Dot Displays

Bar-dot LEDs show audio input levels, wideband and highband audio gain control, and
modulation percentage. Resolution for the gain control and modulation displays is increased
over a conventional bar-graph display using dither enhancement which modulates the
brightness of the LED to give the effect of a fade from dot to dot. (See section 4.7.)

3.3.1 Audio Processor Input

Two vertical, moving-dot displays for the left and right channels indicate the relative audio
levels, in 3 dB steps, at the input of the audio processor. Under normal operating conditions,
the left and right Audio Processor indicators will be active, indicating the relative audio input
level after the Input Gain switches. During program pauses, the red Low LED will light.

The translator configuration shows relative audio levels from the included receiver.

3.3.2 Highband and Wideband Display

During audio processing, the moving-dot displays indicate the amount of gain control for
broadband (Wide) and pre-emphasized (High) audio.
As long as program material causes activity of the Wideband green indicators, determined
by the program source level and Input Gain switches, the transmitter will be fully modulated.
(See section 3.4.)

The Wideband indicator shows short-term “syllabic-rate” expansion and gain reduction
around a long-term (several seconds) average gain set. In the translator configuration, the
Wideband indicator also shows relative RF signal strength.

Program material and the setting of the Processing control determine the magnitude of the
short-term expansion and compression (the rapid left and right movement of the green
light).

High-frequency program content affects the activity of the Highband indicator. With 75–µsec
pre-emphasis, Highband processing begins at about 2 kHz and increases as the audio fre­quency increases. Some programs, especially speech, may show no activity while some
music programs may show a great deal of activity.

3.3.3 Modulation Display

A 10–segment, vertical peak-and-hold, bar graph displays the peak modulation percentage.
A reading of “100” coincides with 75 kHz deviation. The display holds briefly (about 0.1 sec­onds) after the peak. The “Pilot” indicator illuminates when the transmitter is in the stereo
mode.

To verify the actual (or more precise) modulation percentage, connect a certified modulation
monitor to the RF monitor jack on the rear panel.

3-5 Operation

3.4 Input Gain Switches

The “+6 dB” and “+12 dB” slide switches set audio input sensitivity according to the
following table.

Normal Input

Sensitivity

+6dB +12dB

+10dBm Down Down

+4dBm Up Down

-2dBm Down Up

-8dBm Up Up

Illustration 3–4 Input Gain Switches

Find, experimentally, the combination of Input Gain switch settings that will bring the
Wideband gain-reduction indicator to mid scale for “normal” level program material. The
audio processor will accommodate a fairly wide range of input levels with no degradation
of audio quality.

Switches

3.5 Processing Control

Two factors contribute to the setting of the Processing control: program material and
personal taste. For most program material, a setting in the range of 40 to 70 provides good
program density. For the classical music purist, who might prefer preservation of music
dynamics over density, 10 to 40 is a good range. The audio will be heavily processed in
the 70 to 100 range.

If the program source is already well processed, as might be the case with a satellite feed,
set the Processing to “0” or “10”.

3.6 Stereo-Mono Switch

The Stereo-Mono slide switch selects the transmission mode. In Mono, feed audio only to
the left channel. Although right-channel audio will not be heard as audio modulation, it will

affect the audio processing.

3-6 FM30/FM150/FM300 User’s Manual

3.7 RF Output Control

Set this control for the desired output power level. Preferably, set the power with an external
RF wattmeter connected in the coaxial line to the antenna. You may also use the RF power
reading on the digital multimeter.
The control sets the RF output voltage. Actual RF output power varies as the approximate
square of the relative setting of the control. For example, a setting of “50” is approximately
1/4 full power.

3.8 Digital Multimeter

The four-digit numeric display in the center of the front panel provides information on trans­mitter operation. Use the “Up” and “down” push-buttons to select one of the following pa­rameters. A green LED indicates the one selected.

Illustration 3–5 Digital Multimeter

RF Power—Actually reads RF voltage squared, so the accuracy can be affected by VSWR
(RF voltage-to-current ratio). See section 5.4 for calibration. Requires calibration with the
RF reflectometer being used.

SWR—Direct reading of the antenna standing-wave ratio (the ratio of the desired load im­pedance, 50 ohms, to actual load).

ALC—DC gain control bias used to regulate PA supply voltage. With the PA power supply
at full output voltage, ALC will read about 6.0 volts. When the RF output is being regulated
by the RF power control circuit, this voltage will be reduced, typically reading 4 to 5.5 volts.
The ALC voltage will be reduced during PA DC overcurrent, SWR, or LOCK fault conditions.

3-7 Operation

PA DC Volts—Supply voltage of the RF power amplifier.

PA DC Amps—Transistor drain current for the RF power amplifier.

PA DC Temperature—Temperature of the RF power amplifier heatsink in degrees C.

Supply DC Volts—Unregulated DC voltage at the input of the voltage regulators. For battery
operation, this reading is the battery voltage minus a diode drop.

Voltmeter—Reads the voltage at a test point located on the front edge of the motherboard.
A test lead connected to this point can be used for making voltage measurements in the
transmitter. The test point is intended as a servicing aid; an alternative to an external test
meter. Remember that the accuracy is only as good as the reference voltage used by the
metering circuit. Servicing a fault affected by the reference affects the Voltmeter reading.
The metering scale is 0 to 199.9 volts.

In the translator configuration, you can read a relative indication of RF signal strength nu­merically in the Voltmeter setting.

3.9 Fault Indicators

Faults are indicated by a blinking red light as follows:

SWR—Load VSWR exceeds 1.5:1. ALC voltage is reduced to limit the reflected RF power.

Lock—Frequency synthesizer phase-lock loop is unlocked. This indicator normally blinks for
about five seconds at power turn-on. Whenever this light is blinking, supply voltages will be
inhibited for the RF driver stage as well as for the RF power amplifier.

Input—The automatic carrier-off circuit is enabled (see sections 2.11 and 2.12) and the ab­sence of a program input signal has exceeded the preset time. (The circuit treats white or
pink noise as an absence of a program.)

PA DC—Power supply current for the RF power output amplifier is at the preset limit. ALC
voltage has been reduced, reducing the PA supply voltage to hold supply current to the pre­set limit.

PA Temp—PA heatsink temperature has reached 50° C (122° F) for the FM30 and 80° C
(176° F) for the FM150 and FM300.

At about 55° C (131°F) for the FM30 or 82°C (180° F) for the FM150 and FM300, ALC volt­age begins to decrease, reducing the PA supply voltage to prevent a further increase in
temperature. By 60° C (140° F) for the FM50 and 85° C (185° F) for the FM150 and FM300,
the PA will be fully cut off. The heatsink fan (models FM150°and FM300 only) is proportion­ally controlled to hold the heatsink at 35 C (95° F). Above this temperature, the fan runs at
full speed.

3-8 FM30/FM150/FM300 User’s Manual

Section 4—Principles of Operation

This section discusses the circuit principles upon which the transmitter
functions. This information is not needed for day-to-day operation of the
transmitter but may be useful for advanced users and service person­nel.

4-1 Principles of Operation

4.1 Part Numbering

As this section refers to individual components, you should be familiar with the part number­ing scheme used.

The circuit boards and component placement drawings use designators such as “R1”, “R2”,
and “C1.” These same designators are used throughout the transmitter on several different
circuit boards and component placement drawings. When referencing a particular compo­nent it is necessary to also reference the circuit board that it is associated with.

4-2 FM50/FM150/FM300 User’s Manual

4.2 Audio Processor/Stereo Generator Circuit Board

The audio board provides the control functions of audio processing-compression, limiting,
and expansion, as well as stereo phase-error detection, pre-emphasis and generation of the
composite stereo signal.

Illustration 6-4 and accompanying schematic may be useful to you during this discussion.
The overall schematic for the audio board is divided into two sheets; one each for the proc­essor and stereo generator sections of the board.

Reference numbers are for the left channel. Where there is a right-channel counterpart, ref­erence number are in parenthesis.

Illustration 4–1 Audio Processor/Stereo Generator Board

4.2.1 Audio Processor Section

Audio input from the XLR connector on the rear panel of the transmitter goes to instrument
amplifier, U2 (U8). Two-bit binary data on the +6 dB and +12 dB control lines sets the gain
of U2 (U8) to one of four levels in 6-dB steps. Gain of U2 is determined by R5, R6, or R7
(R45, R46, or R47) as selected by analog switch U1.

U3 (U9) is a THAT2180 voltage-controlled amplifier with a control-voltage-to-gain constant

of 6.1 mV/dB. The 2180 is a current-in/current-out device, so signal voltages at the input

and output will be zero. R11 converts the audio voltage at the output of U2 (U8) to current at
the input of U3 (U9). U3 (U9) output current is converted to audio voltage by U4A (U10A).

U4B (U10B) is a unity-gain inverter. When the positive peaks at the output of U4A (U10A) or
U4B (U10B) exceeds the gain-reduction threshold, U15 generates a 0.25 Volts-per-dB DC
control bias, producing wide-band gain reduction for U3 (U9). The dB-linear allows a front­panel display of gain control on a linear scale with even distribution of dB.

4-3 Principles of Operation

Q1 (Q2) is a recover/expansion gate with a threshold about 18 dB below the normal pro­gram level. The amount of short-term expansion and time for gain recovery is controlled by
the PROCESSING control, located on the front panel display board. (See section 3.5.)

Audio components above 15,200 Hz are greatly attenuated by eighth-order switched­capacitor elliptical filter, U5 (U11). The filter cut-off frequency is determined by a 1.52-MHz
clock (100 x 15,200 Hz) signal from the stereo generator section of the board. The broad­band signal level at the output of U5 (U11) is about 5 dB below that required for full modula­tion. (With normal program material, the 5 dB of headroom will be filled with pre­emphasized audio.)

Pre-emphasis in microseconds is the product of the capacitance of C7 (C17), multiplied by
the current-gain of U6 (U12), times the value of R22 (R62). (For description of the device
used for U6 (12), see explanation for U3 (U9) above.) For a 75 micro-seconds pre­emphasis, the gain of U6 (U12) will be about 1.11.

Selection of the pre-emphasis curve (75 µS, 50 µS, or Flat) is made by moving the jumper
on HD1 to the pins designated on the board. Fine adjustment of the pre-emphasis is made
with R23 (R63). (See section 5.1.)

For high-band processing, the peak output of U7A (U13A) and U7B (U13B) is detected and
gain-reduction bias is generated, as with the broadband processor. The high-band process­ing, however, shifts the pre-emphasis curve rather than affecting overall gain. Peak audio
voltages are compared to plus and minus 5-volt reference voltages at the outputs of U19A
and U19B. This same reference voltage is used in the stereo generator section.

A stereo phasing error occurs when left and right inputs are of equal amplitude but opposite
polarity. The most common cause is incorrect wiring of a left or right balanced audio line
somewhere in the program chain-sometimes at the source of a recording. When this hap­pens, all the audio is in the left-minus-right stereo subcarrier-none in the left-plus-right base­band. The error can go unnoticed by one listening on a stereo receiver, but the audio may
disappear on a mono receiver. In normal programming there may be short-term polarity re­versals of left versus right, either incidental or-for effect-intentional. A phase error of several
seconds duration is processed by U14A and U14B and interpreted as a real error. During a
phasing error the right-channel level is gradually reduced by 6 dB. For a listener to a stereo
radio, the right-channel volume will be lower, while on a mono receiver there will be a reduc­tion of volume.

NORMAL/TEST switch. In the TEST position, the stage gains are set to a fixed level. See
section 6.2

4.2.2 Stereo Generator Section

Composite stereo signal is generated from left and right-channel audio inputs. This section
also has the amplifier (U201) for an optional external composite input and provision for in­sertion of SCA signal(s).

4-4 FM30/FM150/FM300 User’s Manual

Processed, pre-emphasized left and right audio is passed through third-order lowpass filters
comprised of U202A (203A) and associated circuitry. The filters decrease the level of audio
products below 30 Hz. This low-frequency roll off is necessary to prevent disturbance to the
phase-lock loop in the RF frequency synthesizer by extremely low-frequency audio compo­nents. (See caution at section 2.8.)

U204 is a precision, four-quadrant, analog multiplier. The output of U204 is the product of
38 kHz applied to the Y input and the difference of left and right audio (L-R signal) applied
to the X input. The resulting output is a double sideband, suppressed carrier/the L-R sub­carrier.

Spectral purity of the stereo subcarrier is dependant on a pure 38-kHz sinewave at the mul­tiplier input.

U207A and Y201 comprise a 7.6-MHz crystal oscillator from which the 19 and 38-kHz sub­carriers are digitally synthesized. U207F is a buffer. The 7.6 MHz is divided by 5 in U208A
to provide 1.52 Mhz, used by switched-capacitor filters U5 and U11 in the audio section.

3.8 MHz, 1.9 MHz, and 304 kHz are also derived from dividers in U208. Exclusive-OR

gates, U210C and U210D, provide a stepped approximation of a 38-kHz sine wave. With
the resistor ratios used, the synthesized sine wave has very little harmonic energy below
the 7th harmonic. U210A and B generate the 19-kHz pilot subcarrier. U211 is a dual
switched-capacitor filter, configured as second-order, low-pass filters, each one with a Q of

5. The 38 and 19-kHz outputs of pins 1 and 20, respectively, are fairly pure sine waves.

Harmonic distortion products are better than 66 dB down-with a THD of less than 0.05%.
SEPARATION control R244 sets the 38-kHz level at the Y input of U204.

Resistor matrix R219, R220, R221, and R223 sum the L+R audio with the L-R subcarrier to
produce a current at the junction of R221 and R223 that will be converted to composite ste­reo (less pilot) at the output of summing amplifier U206A. SCA signal is also injected at the
input of U206A. 19-kHz pilot is combined with composite stereo in summing amplifier
U206B.

Analog switch U205, at the input of U206A, provides switching of left and right audio for ste­reo and mono modes. In the mono mode, right channel audio is disabled, and the left chan­nel audio is increased from 45% modulation to 100%.

MON L and MON R outputs go to the AF Monitor jacks on the rear panel. R209+R210
(R214+R215) and C207 (C210) is a de-emphasis network. Processed, de-emphasized
samples of the left and right audio are used for a studio monitor and for audio testing.
Jumpers at HD201 (HD202) allow selection of 50-µsec or 75-µsec de-emphasis.

VR212A and B supply +7 volts and -7 volts, respectively. A 5-volt reference from the audio
processor section supplies the subcarrier generators.

For an explanation of on-board adjustments see section 5.2.

4-5 Principles of Operation

4.3 RF Exciter Circuit

This circuit is also known as the Frequency Synthesizer. The Frequency Synthesizer part of
the motherboard is no longer a separate module as was the case on older transmitters.The
entire component side of the motherboard is a ground plane. Frequency selector switches
located on the front panel of the transmitter establish the operating frequency. The VCO
(voltage-controlled oscillator) circuitry is inside an aluminum case.

Illustration 6-6 and accompanying schematics can be used as reference in this
discussion.

VCO1 operates at the synthesizer output frequency of 87 MHz to 108 MHz.
The frequency is controlled by a voltage applied to pin 8 of the VCO.
A sample of the RF comes from A2 and is fed to the PLL chip U13.
U13 is a phase-locked-loop frequency synthesizer IC. The 10.24 MHz from the
crystal oscillator is divided to 10 kHz. Internal programmable dividers divide the
87 - 108 MHz RF to 10 kHz. Differences between the two signals produce error signals at
pins 7 and 8 of U14.

Exciter Section

Illustration 4–2 Motherboard (Exciter Section)

Frequency selector switches are read by shift registers U17 and U18. Data from the shift
registers is read by U16 which then programs the PLL (Phase Lock Loop) IC U13.

U14B is a differential amplifier and filter for the error signal. Audio that is out of phase with
that appearing on the error voltage is introduced by U14A., allowing for greater loop band­width with less degradation of the low frequency audio response.

Lock and unlock status signals are available at the outputs of U15E and U15F respectively.

Modulation is introduced to the VCO though R72 and R122.

4-6 FM30/FM150/FM300 User’s Manual

4.5 Metering Circuit

The ALC and metering circuitry is on the motherboard (see Illustration 6–6). This circuit
processes information for the RF and DC metering, and produces ALC (RF level-control)
bias. It also provides reference and input voltages for the digital panel meter, voltages for
remote metering, fan control, and drive for the front-panel fault indicators.

Illustration 6–6 and accompanying schematics complement this discussion.

PA voltage and current come from a metering shunt on the power regulator board. The PAI
input is a current proportional to PA current; R153 converts the current to voltage used for
metering and control. A voltage divider from the PAV line is used for DC voltage metering.

Metering Section

Illustration 4–3 Metering Circuit

U23A, U23B, and U24A, with their respective diodes, are diode linearity correction circuits.
Their DC inputs come from diode detectors in the RF reflectometer in the RF low-pass filter
compartment.

U24B, U24C, are components of a DC squaring circuit. Since the DC output voltage of
U24C is proportional to RF voltage squared, it is also proportional to RF power.

U22C, U22A, U20A, and U22D are level sensors for RF power, reflected RF power, PA
temperature, and external PA current, respectively. When either of these parameters ex­ceeds the limits, the output of U22B will be forced low, reducing the ALC (RF level control)
voltage, which, in turn, reduces the PA supply voltage.

The DC voltage set point for U22A (reflected RF voltage) is one-fifth that of U22C (forward
RF voltage). This ratio corresponds to an SWR of 1.5:1 [(1+.2)/(1– .2)=1.5]. The U25 invert­ers drive the front panel fault indicators.

4-7 Principles of Operation

4.6 Motherboard

The motherboard is the large board in the upper chassis interconnecting the audio proces­sor/stereo generator board or the optional receiver module or the Omnia digital audio proc­essor to the RF exciter and metering circuits. The motherboard provides the interconnec­tions for this boards, eliminating the need for a wiring harness, and provides input/output fil­tering. The RF exciter and Metering circuits are an integral part of the motherboard and are
no longer separate boards as in past transmitter designs.

Also contained on the motherboard is the +5.00 volt reference and the composite drive Op
amp and its associated circuitry.

The motherboard has configuration jumpers associated with different options that can be
added at the time of order or at a later time as an upgrade. The motherboard configuration
chart for these jumpers can be found on the following page.

Configuration
Jumpers

Illustration 4–4 Configuration Jumpers

4-8 FM30/FM150/FM300 User’s Manual

Motherboard Jumper Configuration Chart 4.6.1

Jumper FMA “E” FMA“T”

50KΩ input

FMA“T”

600Ω input

FMA “R” FMA

“Omnia”

Ana l og

input
Z1 Short Short Short Short Short Open
Z2 Short Short Short Short Short Open
Z3 Open Open Short Open Open Open
Z4 Open Open Open Open Open Short
Z5 Open Open Short Open Open Open
Z6 Open Open Open Open Open Short
Z7 Open Open Short Open Open Open
Z8 Open Open Short Open Open Open
Z9 Short Open Open Open Open Open

Z10 Short Open Open Open Open Open
Z11 Short Open Open Open Open Open
Z12 Short Open Open Open Open Open
Z13 Short Open Open Open Open Open
Z14 Short Open Open Open Open Open
Z15 Open Open Open Open Open Open
Z16 Open Open Open Open Open Open
Z17 Open Open Open Open Open Open
Z18 Open Open Open Open Open Open
Z19 Open Open Open Open Open Open
Z20 Open Open Open Open Open Open
Z21 Open Open Open Open Open Open
Z22 Open Open Open Open Open Open
Z23 Short Short Short Short Short Short
Z24 Short Short Short Short Short Short
Z25 Short Short Short Short Short Short
Z26 Short Short Short Short Short Short
Z27 Short Short Short Short Short Short
Z28 Short Short Short Short Short Short
Z29 Short Short Short Short Short Short
Z30 Short Short Short Short Short Short
Z31 Open Open Open Open Open Open
Z32 Short Open Open Open Open Open

Z33 Short Open Short Open Open Open
JMP1 Open Open Open Open Open Open
JMP2 Open Open Open Open Open Open

FMA

“Omnia”

AES i nput

4-9 Principles of Operation

4.7 Display Circuit Board

The front-panel LEDs, the numeric display, the slide switches, and the processing and RF
level controls are mounted on the display circuit board. To access the component side of
the board, remove the front panel by removing 12 screws. The board contains circuits for
the digital panel meter, modulation peak detector, and LED display drivers, as well as indi­cators and switches mentioned above.

Illustration 6–9 and accompanying schematic complement this discussion.

Left and right audio from input stages of the audio processor board (just after the Input Gain
attenuator) go to the L VU and R VU input on the display board. Peak rectifiers U1A and
U1B drive the left and right Audio Input displays. The LED driver gives a 3–dB per step dis­play. The lowest step of the display driver is not used; rather a red LOW indicator lights
when audio is below the level of the second step. Transistors Q1 and Q2 divert current from
the LOW LEDs when any other LED of the display is lit.

Resolution of the linear displays, High Band, Wide Band, and Modulation, has been im­proved using dither enhancement. With dither, the brightness of the LED is controlled by
proximity of the input voltage relative to its voltage threshold. The effect is a smooth transi­tion from step to step as input voltage is changed. U6A, U6B, and associated components
comprise the dither generator. Dither output is a triangular wave.

Composite stereo (or mono) is full-wave detected by diodes D5 and D6, U7, U13, Q3, and
Q4 are components of a peak sample-and-hold circuit.

Oscillator, U9F, supplies a low-frequency square wave to the Fault indicators, causing them
to flash on and off.

Digital multimeter inputs are selected with push buttons located to the right of the multimeter
menu. Signals from the push buttons are conditioned by U9A and U9B. U10 is an up/down
counter. Binary input to U11 from U10 selects a green menu indicator light, and lights the
appropriate decimal point on the numeric readout. The binary lines also go to analog data
selectors on the ALC/ metering board.

Processing control, R50, is part of the audio processor. (See section 4.2.)

The DPM IN and DPM REF lines are analog and reference voltage inputs to digital multime­ter IC U12. They originate from analog data selectors on the ALC/ metering board.

4-10 FM30/FM150/FM300 User’s Manual

4.8 Voltage Regulator Circuit Board

The voltage regulator board is the longer of two boards mounted under the chassis toward
the front of the unit. It has switch-mode voltage regulators to provide +12, –12, and 20 volts.
It also contains the program detection and automatic carrier control circuits.

Illustration 6–10 and accompanying schematic complement this discussion.

U3E and U3F convert a 38–kHz sine wave from the stereo generator into a synchronization
pulse. In the transmitter, synchronization is not used, thus D9 is omitted.

U4 and U5 form a 20–volt switching regulator running at about 35 kHz. U4 is used as a
pulse-width modulator; U5 is a high-side driver for MOSFET switch Q1. Supply voltage for
the two IC’s (approximately 15.5 volts) comes from linear regulator DZ2/Q5. Bootstrap volt­age, provided by D10 and C14, allows the gate voltage of Q1 to swing about 15 volts above
the source when Q1 is turned on. Current through the FET is sensed by R38 and R38A. If
the voltage between pin 5 and 6 of U05 exceeds 0.23 volts on a current fault, drive to Q1 is
turned off. Turn-off happens cycle by cycle. The speed of the turn-off is set by C13.

U6 is a switching regulator for both +12 volts and –12 volts. It runs at about 52 kHz. Energy
for –12 volts is taken from inductor L2 during the off portion of the switching cycle. The –12
volts tracks the +12 volts within a few tenths of a volt. There will be no –12 volts until current
is drawn from the +12 volts.

Q2, Q3, and Q4 form an active filter and switch, supplying DC voltage to the RF driver,
when the Carrier switch is on.

The program detection circuit is made up of U1 and U2. U1A and U1D and associated cir­cuitry discriminate between normal program material and white noise (such as might be pre­sent from a studio-transmitter link during program failure) or silence. U1A and surrounding
components form a band-pass filter with a Q of 3 tuned to about 5 kHz. U1D is a first-order
low-pass filter. Red and green LEDs on the board indicate the presence or absence of pro­gram determined by the balance of the detected signals from the two filters. U2 and U1C
form a count-down timer. The time between a program fault and shutdown is selected by
jumpering pins on header JP1. For times, see section 5.7. The times are proportional to the
value of R21 (that is, times can be doubled by doubling the value of R21) and are listed in
minutes.

4-11 Principles of Operation

4.9 Power Regulator Circuit Board

The power regulator board is the shorter of two boards mounted under the chassis toward
the front of the unit. The board has the isolating diode for the battery input, the switch-mode
voltage regulator for the RF power amplifier, and circuitry for PA supply current metering.

Illustration 6–10 and accompanying schematic complement this discussion.

Diode D4, in series with the battery input, together with the AC-supply diode bridge, pro­vides diode OR-ing of the AC and DC supplies.

U1 and U2 form a switching regulator running at about 35 kHz. U1 is used as a pulse-width
modulator; U2 is a high-side driver for MOSFET switch Q1. Power for the two IC’s comes
from the 20–volt supply voltage for the RF driver (available when the Carrier switch is on).
The voltage is controlled at 16 volts by zener diode DZ1. Bootstrap voltage provided by D2
and C9 allows the gate voltage of Q1 to swing about 16 volts above the source when Q1 is
turned on. Current through the FET is sensed by R12A and R12B. If the voltage from pin 5
to 6 of U2 exceeds 0.23 volts on a current fault, drive to Q1 is turned off. This happens on a
cycle-by-cycle basis. The speed of the turnoff is set by C5.

U3 and Q2 are used in a circuit to convert the current that flows through metering shunt,
R19, into a current source at the collector of Q3. Forty milli-volts is developed across R19
for each amp of supply current (.04 ohms x 1 amp). Q3 is biased by U3 to produce the
same voltage across R16. The collector current of Q3 is the same (minus base current) as
that flowing through R22 resulting in 40 microamperes per amp of shunt current. R5 on the
metering board converts Q3 collector current to 0.1 volt per amp of shunt current (.04 ma X

2.49 k). (See section 5.4.)

4.10 RF Driver/Amplifier (FM30)

The RF Driver/Amplifier assembly is mounted on a 100 mm x 100 mm plate in the under
side of the chassis.

Illustration 6-14 and accompanying schematic complement this discussion.

The driver amplifies the approximate 20 milliwatts from the frequency synthesizer to 30
watts. An MHW6342T hybrid, high-gain, wideband amplifier, operating at about 20 volts,
provides about one watt of drive to a single BLF246 MOSFET amplifier. The BLF245 stage
operates from a supply voltage of 28 volts in the FM30.
The circuit board has components for input and output coupling and for power supply filter­ing.

4-12 FM30/FM150/FM300 User’s Manual

4.11 RF Driver (FM150/FM300)

The RF Driver assembly is mounted on a 100 mm x 100 mm plate in the under side of the
chassis.

Illustration 6-14 and accompanying schematic complement this discussion.

The driver amplifies the approximate 20 milliwatts from the frequency synthesizer to about 8
watts to drive the RF power amplifier. An MHW6342T hybrid, high-gain, wideband amplifier,
operating at about 20 volts, provides about one watt of drive to a single BLF245 MOSFET
amplifier. The BLF245 stage operates from a supply voltage of approximately 20 volts.

The circuit board provides for input/output coupling and for power supply filtering.

4.12 RF Amplifier (FM150/FM300)

The RF power amplifier assembly is mounted on back of the chassis with four screws, lo­cated behind an outer cover plate. Access the connections to the module by removing the
bottom cover of the unit. The RF connections to the amplifier are BNC for the input and out­put. Power comes into the module through a 5–pin header connection next to the RF input
jack.

Illustration 6-12 and accompanying schematic complement this discussion.

The amplifier is built around a ST MicroElectronics SD2942, a dual power MOSFET rated
for 50 volts DC and a maximum power of about 350 watts. When biased for class B, the
transistor has a power gain of about 20 dB. (It is biased below class B in the transmitter.)

Input transformer, T11, is made up of two printed circuit boards. The four-turn primary board
is separated from the one-turn secondary by a thin dielectric film. R12–R17 are for damp­ing. Trim pot R11 sets the bias.

Output transformer, T21, has a one-turn primary on top of the circuit board and a two-turn
secondary underneath. Inductors L21 and L22 provide power line filtering.

4-13 Principles of Operation

4.13 Chassis

The AC power supply components, as well as the bridge rectifier and main filter capacitor,
are mounted on the chassis. Switching in the power-entry module configures the power
transformer for 100, 120, 220, or 240 VAC; see section 2.2 for switching and fuse informa­tion. A terminal strip with MOV voltage-surge suppressors and in-rush current limiters is
mounted on the chassis between the power entry module and the toroidal power trans­former.

The main energy-storage/filter capacitor, C01, is located between the voltage and power
regulator boards. The DC voltage across the capacitor will be 45–55 volts (FM30 and
FM150) or 65–70 volts (FM300) when the carrier is on.

4.14 RF Output Filter & Reflectometer

The RF low-pass filter/reflectometer are located in the right-hand compartment on the top of
the chassis. See Illustration 6–13 and accompanying schematic for more information.

A ninth-order, elliptic, low-pass filter attenuates harmonics generated in the power amplifier.
The capacitors for the filter are circuit board pads.

The reflectometer uses printed circuit board traces for micro-strip transmission lines. Trans­mission line segments (with an impedance of about 82 ohms) on either side of a 50–ohm
conductor provide sample voltages representative of the square root of forward and reverse
power.

DC voltages, representative of forward and reflected power, go through a bulkhead filter
board to the motherboard, then to the metering board, where they are processed for power
control and metering and for SWR metering and protection.

4-14 FM30/FM150/FM300 User’s Manual

4.15 Receiver Circuit Board Option

This option allows the transmitter to be used as a translator. The receiver board receives
terrestrially fed RF signal and converts it to composite audio which is then fed into the ex­citer board. Microprocessor controlled phase lock loop technology ensures the received fre­quency will not drift, and multiple IF stages ensure high adjacent channel rejection. Refer to
illustrations 4–6, 6–16 and its schematic for the following discussion.

The square shaped metal can located on the left side of the receiver board is the tuner
module. The incoming RF signal enters through the BNC connector (top left corner) and is
tuned through the tuner module. Input attenuation is possible with the jumper labeled “LO”
“DX”, on the top left corner of the receiver board. Very strong signals can be attenuated 20
dB automatically by placing the jumper on the left two pins (“LO” position). An additional 20
dB attenuation is also available with the jumpers in the top left corner of the board. The fre­quencies are tuned by setting switches SW1 and SW2 (upper right corner). These two
switches are read upon power up (or by momentarily shorting J7) by the microprocessor
(U4). The microprocessor then tunes the tuner module to the selected frequency. The fre­quency range is 87.9 Mhz at setting “00” to 107.9 Mhz at setting “64”. Other custom ranges
are available.

Located in the lower left-hand corner of the Receiver Module is a 3.5mm headphone jack.
Demodulated Left and Right audio is present at this jack. A regular pair of 32 ohm stereo
headphones, such as the types used with portable audio devices, can be used to monitor
the audio on the receiver module.

Receiver
Module

Illustration 4–5 Receiver Module

4-15 Principles of Operation

When a stereo signal is present, LED 3 illuminates which indicates that left and right audio
is available. Then the stereo signals go to gain stages and out to the RCA jacks on the back
of the cabinet. These can be used for off-air monitoring of the audio signal. Incoming fre­quency can be monitored from the frequency monitor BNC jack on the back. The stereo
buffer, stereo decoder, and gain stages and have no effect on the signal that goes through
the transmitter.
The power supply is fairly straight forward. The incoming 12 volt supply goes to a 7809, 9
volt regulator (VR1) which supplies all 9–volt needs on the board. The 9 volts also supplies
a 7805, 5 volt regulator (VR2) which supplies all 5–volt needs on the board. Plus and minus
12 volts from the motherboard is filtered and supplies various needs on the board. Finally
there is a precision reference voltage. Two 2.5 volt reference shunts act very much like a
very accurate zener diode to provide a precision 5 volt supply to the metering board.

4-16 FM30/FM150/FM300 User’s Manual

Section 5—Adjustments and Tests

This section describes procedures for (1) advanced users who may be
interested in customizing or optimizing the performance of the transmit­ter and (2) service personnel who want to return the transmitter to op­erational status following a maintenance procedure.

5-1 Adjustments and Tests

5.1 Audio Processor Adjustments

5.1.1 Pre-Emphasis Selection

Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appro­priate pins of header HD1 on the audio processor/stereo generator board. (See section 2.9.)
If you change the pre-emphasis, change the de-emphasis jumpers, HD201 and HD202 on
the audio processor/stereo generator board, to match. (See section 2.8.)

5.1.2 Pre-Emphasis Fine Adjustment

Trim potentiometers, R23 and R63, (for left and right channels, respectively) provide for fine
adjustment of the pre-emphasis. Set the potentiometers to bring the de-emphasized gain at
10 kHz equal to that of 400 Hz. (At the proper setting, 15.0 kHz will be down about 0.7 dB.)

When making these adjustments, it is important that you keep signal levels below the proc­essor gain-control threshold.

A preferred method is to use a precision de-emphasis network in front of the audio input.
Then, use the non-de-emphasized (flat) output from the FM modulation monitor for meas­urements.

5.2 Stereo Generator Adjustments

5.2.1 Separation

Feed a 400–Hz sine wave into one channel for at least 70% modulation. Observe the clas­sic single-channel composite stereo waveform at TP301 on the RF Exciter circuit board. Ad­just the Separation control R244 for a straight centerline.
Since proper adjustment of this control coincides with best stereo separation, use an FM
monitor to make or confirm the adjustment.

5-2 FM30/FM150/FM300 User’s Manual

5.2.2 Composite Output

You can make adjustments to the composite output in the following manner:

Using a Modulation Monitor

1. Set the Stereo-Mono switch to Mono.

2. Check that the setting of the Modulation compensation control (see illustration 2–9) on
the RF Exciter circuit , falls within the range specified for the frequency of operation.
(See section 2.3.1.)

3. Feed a sine wave signal of about 2.5 kHz into the left channel at a level sufficient to put
the wideband gain-reduction indicator somewhere in the middle of its range.

4. Set the Composite level control to produce 90% modulation as indicated on an FM
monitor.

5. Apply pink noise or program material to the audio inputs and confirm, on both Mono and
Stereo, that modulation peaks are between 95% and 100%.

5.2.3 19–kHz Level

Adjust the 19–kHz pilot for 9% modulation as indicated on an FM modulation monitor.
(The composite output should be set first, since it follows the 19–kHz Level control.)

5.2.4 19–kHz Phase

1. Apply a 400–Hz audio signal to the left channel for at least 70% modulation.

2. Look at the composite stereo signal at TP301 on the RF Exciter circuit board with an os­cilloscope, expanding the display to view the 19–kHz component on the horizontal cen­terline.

3. Switch the audio to the right-channel input. When the 19–kHz Phase is properly ad­justed, the amplitude of the 19–kHz will remain constant when switching between left
and right.

4. Recheck the separation adjustment as described in section 5.2.1.

5.3 Frequency Synthesizer Adjustments

5.3.1 Frequency (Channel) Selection

Refer to section 2.3.

5-3 Adjustments and Tests

5.3.2 Modulation Compensator

Refer to section 2.3.1

5.3.3 Frequency Measurement and Adjustment

Next to the 10.24–MHz VCXO in the RF Exciter circuit on the motherboard, is a 50K potenti­ometer (R101). Use R101 to set the frequency of the 10.24–MHz VCXO while observing the
output frequency of the synthesizer.

Use one of two methods for checking frequency:

1. Use an FM frequency monitor.

2. Couple a frequency counter of known accuracy to the output of the synthesizer and ob­serve the operating frequency.

5.3.4 FSK Frequency Offset Control

An FSK signal (used for automatic identification of FM repeaters) shifts the frequencies of
the 10.24–MHz VCXO reference oscillator and the VCO.

Ground pin 4 on the DB25 connector located on the back panel of the transmitter. This will
shift the operating frequency. Adjust R224 for an offset of the operating frequency of about
6 kHz. Un-grounding pin 4 will cause the operating frequency to return to normal.

Use one of two methods for checking frequency:

1. Use an FM frequency monitor.

2. Couple a frequency counter of known accuracy to the output of the synthesizer and ob­serve the operating frequency.

5.4 Metering Adjustments

5.4.1 Power Calibrate

While looking at RF Power on the digital panel meter, set the Power Calibrate trim potenti­ometer (R215) to agree with an external RF power meter.

5.4.2 Power Set

With the front panel RF Output control fully clockwise, adjust the Power Set trim pot (R55)
to 10% more than the rated power (33 W for FM30, 165 W for FM150, 330 W for FM300) as
indicated on an accurate external watt meter. If the authorized power is less than the maxi­mum watts, you may use the Power Set to limit the range of the RF Output control.

5-4 FM30/FM150/FM300 User’s Manual

5.4.3 SWR Calibrate

When the Carrier switch is off, or the RF power is less than about 5 watts, the SWR circuit
automatically switches to a calibrate-check mode. (See section 4.5 for more information.)
Set the digital panel meter to read SWR. With the Carrier switch off, set the SWR CAL trim
pot (R66) to read 1.03.

5.4.4 PA Current Limit

Since it may not be practical to increase the PA current to set the PA Current Limit control,
you may use this indirect method.

With the carrier turned off, look at the DC voltage at the right end of R186 in the Metering
circuit on the motherboard. The current limit, in amperes, will be 0.35 amps higher than ten
times this voltage. For example, for a current limit of 7.35 amps, adjust the PA Current Limit
control for 0.7 volts at R186 ; or 0.565 volts for 6.0 amps. Set the current limit for 4 amps
(FM50), 7 amps (FM150), or 9.5 amps (FM300).

5.5 Motherboard Configuration

See section 4.6.1 for motherboard jumper configuration.

5.6 Display Modulation Calibration

The Modulation Calibrate trim pot sets the sensitivity of the front panel Modulation bar graph
display.

This adjustment may be made only after the Output trim pot on the Audio Processor/Stereo
Generator board has been set. (See section 5.2.2.)

Set the Stereo-Mono switch to Mono.

Feed a sine wave source of about 2.5 kHz into the left channel at a level sufficient to put the
wideband gain-reduction indicator somewhere in the middle of its range.

Set the Modulation Calibrate trim pot so that the “90” light on the front panel Modulation dis­play just begins to light.

5-5 Adjustments and Tests

5.7 Voltage Regulator Adjustments

JP1, a 10–pin header on the Voltage Regulator board, sets the time between program fail­ure and carrier turnoff. Pins 1 and 2 are the two pins closest to the edge of the board. The
times are approximate. Sections 2.11, 2.12, and 4.8 contain further information.

1. Short pins 1 and 2 for a 30–second delay.

2. Short pins 3 and 4 for a 2–minute delay.

3. Short pins 5 and 6 for a 4–minute delay.

4. Short pins 7 and 8 for an 8–minute delay.

You may select other times by changing the value of R21. The time is proportional to the re­sistance.

5.8 Bias Set (RF Power Amplifier)

The Bias Set trim pot is located inside the PA module on the input circuit board. Set the trim
pot to its midpoint for near-optimum bias.

5-6 FM30/FM150/FM300 User’s Manual

5.9 Performance Verification

Measure the following parameters to receive a comprehensive characterization of trans­mitter performance:

• Carrier frequency

• RF output power

• RF bandwidth and RF harmonics (see section 5.12)

• Pilot frequency, phase, and modulation percentage

• Audio frequency response

• Audio distortion

• Modulation percentage

• FM and AM noise

• Stereo separation between left and right

• Crosstalk between main channel and subcarrier

• 38–kHz subcarrier suppression

• In addition to the above tests, which pertain to signal quality, a complete check of the

unit will include items listed in section 5.21.

5.9.1 Audio Proof-of-Performance Measurements

References to “100%” modulation assume 9% pilot and 91% for the remainder of the com­posite stereo signal.

Because the audio processing threshold is at 90% modulation, it is not possible to make
audio proof-of-performance measurements at 100% modulation through the audio proces­sor. Instead, data is taken at a level below the audio processing threshold at 80% modula­tion.

5.9.2 De-emphasis Input Network

A precision de-emphasis network, connected between the test oscillator and the audio in­put of the transmitter, can be very helpful when making the audio measurements. Note
that the input impedance of the transmitter or the source impedance of the test oscillator
can affect network accuracy. With the de-emphasis network, oscillator level adjustments
need only accommodate gain errors, instead of the whole pre-emphasis curve.

5-7 Adjustments and Tests

5.10 Carrier Frequency

Carrier frequency is measured at the output frequency with a frequency monitor or suitable
frequency counter.

To adjust frequency, see section 5.3.3. (FCC tolerance +/– 2000 Hz per FCC Part 73.1540
and 73.1545.)

5.11 Output Power

The output power reading on the front panel display should be 90–105% of the actual value.
For a more precise measurement, use a watt meter in the RF output line. See sections

5.4.1 and 5.4.2 for setting power.

5.12 RF Bandwidth and RF Harmonics

You can observe RF bandwidth and spurious emissions with an RF spectrum analyzer.

In the Stereo mode, feed a 15.0–kHz audio signal into one channel to provide 85% modula­tion as indicated on a monitor. Doing so produces 38% main, 38% stereo subcarrier, and
9% pilot per FCC Part 2.1049. As an alternative, use pink noise into one channel.

Using a spectrum analyzer, verify the following (per FCC 73.317):

1. Emissions more than 600 kHz from the carrier are at least 43 + 10log(power, in watts)
dB down (58 dB for 30 watts, 65 dB for 150 watts, 68 dB for 300 watts). The scan
should include the tenth harmonic.

2. Emissions between 240 kHz and 600 kHz from the carrier are down at least 35 dB.

3. Emissions between 120 kHz and 240 kHz from the carrier are down at least 25 dB.

5.13 Pilot Frequency

The pilot frequency should be within 2 Hz of 19 kHz. (FCC Part 73.322.) Using a frequency
counter, measure 1.9 MHz at pin 13 of U208 on the Audio Processor/Stereo Generator
board. A 200–Hz error here corresponds to a 2–Hz error at 19 kHz. If the frequency is off by
more than 50 Hz, you may change the value of C213. (Changing C213 from 56 pF to 68 pF
lowers the 1.9 MHz by about 35 Hz.)

5.14 Audio Frequency Response

For the response tests, take the readings from an FM modulation monitor.
Make audio frequency response measurements for left and right channels at frequencies of
50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2.

5-8 FM30/FM150/FM300 User’s Manual

5.15 Audio Distortion

Make distortion measurements from the de-emphasized output of an FM modulation moni­tor.

Make audio distortion measurements for left and right channels at frequencies of 50 Hz, 100
Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2.

5.16 Modulation Percentage

While feeding an audio signal into the left channel only, confirm that the total modulation
percentage remains constant when switching between Mono and Stereo.

Measure modulation percentage with an FM modulation monitor. See section 5.2.2.

19–kHz pilot modulation should be 9%.

5.17 FM and AM Noise

Take noise readings from a de-emphasized output of a modulation monitor.

5.18 Stereo Separation

Make left-into-right and right-into-left stereo separation measurements with an FM modula­tion monitor for frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz.

5.19 Crosstalk

For stereo crosstalk measurements, both left and right channels are fed at the same time.
For best results, there needs to be a means of correcting small imbalances in levels and
phase. The balance is made at 400 Hz.

5.19.1 Main Channel Into Sub

Feed the left and right channels in phase with audio (L+R) at 50 Hz, 100 Hz, 400 Hz, 1 kHz,
5 kHz, 10 kHz, and 15 kHz at 100% modulation, while observing the stereo subcarrier (L-R)
level on an FM modulation monitor.

5.19.2 Sub Channel Into Main

Feed the audio into the left and right channel as above, with the exception of reversing the
polarity of the audio of one channel (L-R input). Using the frequencies of 5.19.1 above, ob­serve the main channel (L+R) level with a modulation monitor.

5-9 Adjustments and Tests

5.20 38–kHz Subcarrier Suppression

With no modulation, but in the Stereo mode, the 38–kHz subcarrier, as indicated on an FM
modulation monitor, should be down at least 40 dB.

5.21 Additional Checks

In addition to the tests and adjustments mentioned in this section, the following checks en­sure a complete performance appraisal of the transmitter:

1. Perform a physical inspection, looking for visible damage and checking that the chassis
hardware and circuit boards are secure.

2. Check the functionality of switches and processing control.

3. Verify that all indicators function.

4. Check the frequency synthesizer lock at 80 MHz and 110 MHz.

5. Measure the AC line current with and without the carrier on.

6. Perform a functional test of the SCA input, Monitor outputs, and the monitor and control
function at the 15–pin, D-sub connector.

7. Test the functionality of the FSK circuit.

8. Check the operation and timing of the automatic carrier-off circuitry associated with pro­gram failure.

9. Check all metering functions.

10. Test ALC action with PA current overload, SWR, and PLL lock.

NOTE:

FCC type acceptance procedures call for testing the carrier frequency over the temperature
range of 0–50 degrees centigrade, and at line voltages from 85% to 115% of rating. (See
FCC Part 2.1055.)

5-10 FM30/FM150/FM300 User’s Manual

Section 6—Reference Drawings

The illustrations in this section may be useful for making adjustments,
taking measurements, troubleshooting, or understanding the circuitry of
your transmitter.

6-1 Reference Drawings

6.1 Views

Gain

Reduction/Expansion

Indicators

Audio Processor

Input Level

Indicators

RF Output

Digital Multimeter

Processing Control

Input Gain

Switches

Illustration 6-1 Front View

Receiver Input
(Optional)

Fault Indicators

Multimeter Select

Stereo/Mono

Switch

Frequency Selector

Switches

Composite Input

Carrier Switch

Modulation Indicators

Power Switch

RF Output

Control

Audio Inputs

RF Output Monitor

AC Power Input

SCA Inputs

RF Power Amplifier
(FM150/300 Only)

Audio Monitors

Illustration 6-2 Rear View

Remote I/O

Circuit Breaker

DC Input

6-2 FM30/FM150/FM300 User’s Manual

Metering
Circuit

RF Low Pass
Filter &
Reflectometer

RF Exciter
Circuit

RF output

Audio Processor
Section

Stereo Generator
Section

DC Input

Power Amplifier
(FM150/M300 Only)

Voltage Regulator

RF Pre-driver/
Amplifier

Bridge Rectifier

Illustration 6-3 Chassis Top View

Power Regulator

Filter Capacitor

AC Power
Transformer

AC Power
Entry

Illustration 6-4 Chassis Bottom View

6-3 Adjustments and Tests

Notes:

6-4

FM30/FM150/FM300 User’s Manual

Illustration 6-5 Audio Processor/Stereo Generator Board

6.2 Board Layout and Schematics

6-5 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

Schematic Diagram: Audio Processor/ Stereo Generator (Sheet 1 of 2)

1 2 3 4 5 6 7 8 9 10 11 12

A

B

C

D

E

F

G

H

12

1110987654321

H

G

F

E

D

C

B

A

DWG. NO. REV.

E . C . N. REV DESCRIPTION

APPROVALS

PECHK CMDATE DWN

REVISION HISTORY

65

THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS
THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET OF

SCALE : NONE

PROJ NO.

FILENAME:

DWG . NO .

REV

TITLE:

UNCONTROLLED

UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
CONTROLLED COPY, COPIES OF THESE DOCUMENTS
INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.

APPROVALS
DWN
CHK
CM
PE

DISTRIBUTION

K

SIZE

D

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

RG1

1

2

3

7

5

RG2

8

6

4

U2

AD622

R1
1K

R2

49.9KC3100pF

C1

1uF

+12V

-12V

R3
1K

R4

49.9K

C4

100pF

C2

1uF

R11

10.0K

IN

1

EC+2EC-

3

V+

7

V-

5

OUT

8

GND6SYM

4

U3

THAT2180

+12V

R12

2.00K
R13

49.9

R14

5.1K

-12V

0X

12

1X

14

2X

15

3X

11

0Y

1

1Y

5

2Y

2

3Y

4

A

10

B

9

INH

6

X

13

Y

3

U1

74HC4052

R5

49.9

R6

49.9

R7

49.9

3

2

1

8 4

U4A

TL072

R15

49.9K

C5

22pF

-12V

+12V

R16

24.9K

5

6

7

U4B

TL072

D2
1N6263

D1
1N6263

R17

24.9K

INV C

1

Vin

2

AGND

3

V+

4

AGND

5

COMP1*

6

INV A7NC

8

Vout

9

NC

10

fCLK

11

V-

12

COMP2*

13

R(h I)

14

U5

LTC1064-1

R18
100K

Q1

2N5087

R19
OPEN

RG1

1

2

3

7

5

RG2

8

6

4

U8

AD622

R41
1K

R42

49.9K

C13

100pF

C11

1uF

+12V

-12V

R43
1K

R44

49.9K

C14

100pF

C12

1uF

R51

10.0K

IN

1

EC+2EC-

3

V+

7

V-

5

OUT

8

GND6SYM

4

U9

THAT2180

+12V

R52

2.00K

R53

49.9

R54

5.1K

-12V

R47

49.9

R46

49.9

R45

49.9

3

2

1

8 4

U10A

TL072

R15

49.9K

C15

22pF

-12V

+12V

R56

24.9K

5

6

7

U10B

TL072

D8
1N6263

D7
1N6263

R57

24.9K

INV C

1

Vin

2

AGND

3

V+

4

AGND

5

COMP1*

6

INV A7NC

8

Vout

9

NC

10

fCLK

11

V-

12

COMP2*

13

R(h I)

14

U11

LTC1064-1

R58
100K

Q2

2N5087

R59
OPEN

5

6

7

U14B

TL072

R84
10M

D28

1N4148

C30

1uF

R88
10K

D29

1N4148

R85

5.1K

R86
100K

R87
10K

DL1
RED

D26

1N6123

D25

1N4148

D27

1N4148

R82
100K

R83
100K

R81
30K

R80
30K

3

2

1

8 4

U14A

TL072

R79
10K

-12V

+12V

STEREO

POLARITY

ERROR

LEFT-RIGHT PHASING DETECTOR
RIGHT LEVEL REDUCED 6dB
DURING POLARITY ERROR.

/STEREO FAULT

.006V/DB

3

2

1

8 4

U15A

TL072

R90

100

-12V

+12V

BR GR

R103
240K

R93

49.9K

D22

1N4148

D21

1N4148

R89
100K

R91

49.9K

R92

49.9K

R94

49.9K

5

6

7

U15B

TL072

D14

1N4148

C22

100pF

C20

100pF

D13

1N4148
R99

3.3M

R98
330K

C21

.047uF

POLY

R96
ZERO

R60

3.3K
R97
10M

PROC B

(J3-18)

PROC A

(J3-16)

PROC C

(J3-20)

TO R50 ON
DISPLAY BD.

HEAVY

LIGHT

R101

1.0K

C23
1uF

R100
10M

R102

10.0K

R95

3.0K

-VT

NC

1

Vin

2

NC

3

GND4TRIM

5

Vout

6

NC

7

NC

8

U18

REF02

3

2

1

8 4

U19A

NE5532

5

6

7

U19B

NE5532

R126
10K

C32
.01uF

C36
.01uF

-12V

+12V+12V

R128
100

R127

4.7K

R129

10.0K

R130
100

C33
1uF

C34
1uF

C35
1uF

+5V

+5.00V

+5V

VCC

C37
1uF

C38
1uF

-5V

VSS

+12V 1

2

3

SW1

SIP3

NORMAL

TEST

+12V

D23

1N4148

R104

5.1K

3

2

1

8 4

U17A

NE5532

D24

1N4148

R105
10K

+5V

+12V

-12V

R106

49.9K

5

6

7

U17B

NE5532

R107

49.9K

+VT

-VT

R20
1K

C10

0.1uF

+

C28

10uF

TANT

DS1

1N5818

+7V

DS2

1N5818

+

C29
10uF

TANT

-7V

R10

510

1.52MHz

C6

1uF

C6A

1uF

C16

1uF

C16A

1uF

IN

1

EC+2EC-

3

V+

7

V-

5

OUT

8

GND6SYM

4

U6

THAT2180

R23
10K

R24
30K

+5V

-5V

R27

1.0K
R28

1.0K

1 2
3 4
5 6
7 8
9 10

HD1

HEADER 5X2

R70

5.62K

R68

1.0K

R67

1.0K

C7
.0027uF

POLY (C8687-3)

R21
300

R25

49.9

R26

5.1K

-12V

R22

24.9K

+12V

+5V

IN

1

EC+2EC-

3

V+

7

V-

5

OUT

8

GND6SYM

4

U12

THAT2180

R63
10K

R64
30K

+5V

-5V

C17
.0027uF

POLY (C8687-3)

R61
300

R65

49.9

R66

5.1K

-12V

R62

24.9K

+12V

FLAT
50uS

75uS

3

2

1

8 4

U7A

TL072

R29

24.9K

-12V

+12V

C8

33pF

5

6

7

U7B

TL072

D1

1N6263

R35

24.9K

D1

1N6263

R36

24.9K

R37
499

D5

1N4148

D6
1N4148

+VT

-VT

C9
2200pF

POLY

LEFT

3

2

1

8 4

U13A

TL072

R69

24.9K

-12V

+12V

C18

33pF

5

6

7

U13B

TL072

D9

1N6263

R75

24.9K

D10

1N6263

R76

24.9K

R77
499

D11

1N4148

D12
1N4148

+VT

-VT

C19
2200pF

POLY

RIGHT

5

6

7

U16B

TL072

R118

3.3K

R119

24.9K

C24

.01uF

POLY

R120
OPEN

C25

OPEN

C26

100pF

D17

1N4148

R121

1M

C27
1uF

R122

1.0K

R123

10.0K

R116

49.9K

R115

49.9K

R117
560

-VT

3

2

1

8 4

U16A

TL072

+12V

-12V

R113

49.9K

R114

49.9K

D16

SHORT

0.25V/DB

R112
100

HI GR

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26

J3

RECEPT 13X2

/STEREO FAULT

HI GR

BR GR

PROC C

PROC B

PROC A

+5.00V

R VU

L VU

/+12DB

/+6DB

-12V

+12V

+/- 12V FOR OP-AMPS AND VCA'S.

+/- 7V AT 56mA FOR LTC 1064-1 AND LMF100.

+/- 5V FOR LOGIC (+5V TAKEN FROM +5.00V BU

S

+5.00V REFERENCE VOLTAGE. ALSO USED BY

D

+/- 4.4 FOR PEAK LEVEL THRESHOLD REFEREN

C

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20

J1

RECEPT 10X2

L IN1
L IN2
R IN1
R IN2

15.2 KHz LOW-PASS FILTER
(8th ORDER ELLIPTICAL)

(INTO 600 ohms)

dbm V-rms V-peak

-10 .245 .346
0 .774 1.1
+10 2.45 3.46

TURKEY SPECIFICATIONS:

Baseband:
30Hz - 53KHz +/- 0.2dB.
53KHz - 76KHz +/- 0.4dB.

40Hz - 15KHz +/- 0.5dB

GAIN R9-14

--------------------------­ 0dB OPEN
+6dB 50.5K
+12dB 16.8K
+18dB 7.21K

L VU

L IN2

L IN1

R38
47K

R39
47K

+5V

/+12DB
/+6DB

R IN2

R IN1

R VU

L SAMPLE

R SAMPLE

R SAMPLE

L SAMPLE

LEFT

LEFT

RIGHT

RIGHT

CLOCK

1.52MHz

+12V

-12V
+7V

-7V

+5V

+5.00V

-5V

-5V

+12V

-12V
+7V

-7V

+5V

-5V

VDD

VEE

+VT

-VT

+VT

-VT

GND

GND

C40
1uF

C42
1uF

C44
1uF

C41
1uF

C43
1uF

C45
1uF

-12V

+12V

+12V

-12V

201409F-SCH

12

C

AUDIO PROCESSOR/STEREO GENERATOR

DW 03-15-07

DW 03-15-07
DP 03-15-07

Copyright (c) 2007 HCJB Global

6-6 Adjustments and Tests

Schematic Diagram: Audio Processor/ Stereo Generator (Sheet 2 of 2)

1 2 3 4 5 6 7 8 9 10 11 12

A

B

C

D

E

F

G

H

12

1110987654321

H

G

F

E

D

C

B

A

DWG. NO. REV.

65

THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS
THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET OF

SCALE : NONE

PROJ NO.

DWG . NO .

REV

TITLE:

UNCONTROLLED

UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
CONTROLLED COPY, COPIES OF THESE DOCUMENTS
INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.

SIZE

B

RG1

1

2

3

7

5

RG2

8

6

4

U201

AD622

R203
1K

R204

49.9K

C202

100pF

+12V

-12V

R201
1K

R202

49.9K

C201

100pF

R206

3.9K

EXT IN-

EXT IN+

R205

OPEN

3

2

1

8 4

U202A

TL072

R207
150K

C206

.047uF

-12V

+12V

R208
300K

POLY

C205

.047uF

LEFT

R209

4.99K

123

HD201
SIP3

R210

2.49K

C207
.01uF

POLY

5

6

7

U202B

TL072

R211
100

MON L

3

2

1

8 4

U203A

TL072

R212
150K

C209

.047uF

-12V

+12V

R213
300K

POLY

C208

.047uF

RIGHT

R214

4.99K

123

HD202

SIP3

R215

2.49K

C210
.01uF

POLY

5

6

7

U203B

TL072

R216
100

MON R

POLY

POLY

50 75

50 75

X1

1

X2

2

U0

3

U1

4

U2

5

Y1

6

Y27V-

8

REF

9

Z2

10

Z1

11

OUT

12

DD

13

V+

14

U204

AD734

R220

10.0K

R219

10.0K

R218

9.09K

+12V

C211
56pF

C212

120pF

1%

R221

4.99K

R223

9.09K

X1

1

X2

2

Y1

3

V+

8

V­5

OUT

7

Z6Y2

4

U204A

AD633JN

-12V

+12V

R254

49.9K

AD633 ALTERNATE TO AD 734

R254 used ONLY with AD633

AD734 has internal 50K

LPA1BPA

2

HPA

3

INV A

4

S1 A

5

SA/B

6

VA+7VD+

8

LSH

9

CLK A

10

CLK B1150/10012VD-13VA-14AGND15S1 B16INV B17HPB18BPB19LPB

20

U211
LMF100

C218

0.1uF

R252
1K

C219
1000pF

POLY

R253
1K

C219
1000pF

POLY

C221

0.1uF

R255
1K

C222
1000pF

POLY

R256
1K

C223
1000pF

POLY

+7V

-7V

R247 49.9K

R24610.0K

R251 49.9K

R25010.0K

R245
13K

R244

5K

C216

0.1uF

12

13

11

U210D

74HC86

9

10

8

U210C

74HC86

R240
24K

R241
10K

4

5

6

U210B

74HC86

1
2

3

U210A

74HC86

R242
120K

R243

49.9K

C216

0.1uF

CLR

12

CKA

13

QA

11

QB

10

QC

9

QD

8

U209B

74HC393

9 8

U207D

MC74HC04

11 10

U207E

MC74HC04

CLR

2

CKA

1

QA

3

QB

4

QC

5

QD

6

U209A

74HC393

R266

OPEN

R267
1K

SYNC OUT

38KHz

19KHz

2CLR

14

2CKA

15

2QA

13

2CKB

12

2QB

11

2QC

10

2QD

9

U208B

74HC390

304KHz

1CLR

2

1CKA

1

1QA

3

1CKB

4

1QB

5

1QC

6

1QD

7

U208A

74HC390

3.8MHz

1.52MHz

1.9MHz

5 6

U207C

MC74HC04

/EXT ENABLE

R238
10K

+5V

3 4

U207B

MC74HC04

13 12

U207F

MC74HC04

1 2

U207A

MC74HC04

R237
1M

C215
33pF

NPO

C214

5.5-18pF

Y201

7.6 MHz

C213

56pF

NPO

R236
1K

0X

12

1X

14

2X

15

3X

11

0Y

1

1Y

5

2Y

2

3Y

4

A

10

B

9

INH

6

X

13

Y

3

U205

74HC4052

R222

200K

D206

1N4148

D204

1N4148

D202

1N4148

D205

1N4148

D203

1N4148

D201

1N4148

MONO/STEREO

R239

10K

3

2

1

8 4

U206A

MC34083

-12V

+12V

R225

12.4K

R224
1K

C204

OPEN
R230

0

C203
100pF

R217

0

SCA IN

EXTERNAL COMPOSITE

INPUT

Composite Spec. (Turkey):
30Hz - 53KHz +/- 0.2 dBr
53KHz - 76KHz +/- 0.4dB

r

R234
1K

D208

1N4148

D207

1N4148

+5V-5V

R227
1K

R228
3K

COMPOSITE OUTPUT

R226
43K

5

6

7

U206B

MC34083

R231
20K

C224

22pF

R232
100

R233
100

COMP OUT

COMP METER

R229

24K

R258
1K

R257
43K

R259
3K

19KHz Level

5

6

7

U212B

TL072

C224
.001

+5V

R263

24.9K

Q202

MPS-A06

+12V

R264
10K

+7V

R265

10

3

2

1

8 4

U212A

TL072

R260

10.0K

-12V

+12V

C226
.001

Q201
MPS-A56

-12V

R262

10

R261

10K

-7V

12

34

56

78

910

J203

RECEPT 5X2

-12V
+12V

DZ2
ICTE-15

DZ1

ICTE-15

-12V
+12V

1
2
3
4
5
6
7
8
9
10
11
12

J201

12 HEADER

EXT IN+
EXT IN­SCA IN
COMP OUT
COMP METER
MONO/STEREO
/EXT ENABLE
GND

1
2
3
4
5
6
7
8
9
10
11
12

J202

12 HEADER

MON L
MON R

GND

+5.00V
SYNC OUT

C227
1uF

C228
1uF

-7V +7V

LEFT 8VPP (AT 2000Hz)

RIGHT 8VPP (AT 2000Hz)

201409F-SCH

2

C

AUDIO PROCESSOR/STEREO GENERATOR

2

LEFT

LEFT

RIGHT

RIGHT

CLOCK

1.52MHz

+12V

-12V
+7V

-7V

+5V

+5.00V

-5V

-5V

+12V

-12V
+7V

-7V

+5V

-5V

VDD

VEE

+VT

-VT

+VT

-VT

GND

GND

SEPARATION

Copyright 2006 Michael P. Axman

Copyright (c) 2007 HCJB Global

6-7 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

Illustration 6-6 Motherboard

Adjustments and Tests 6-8

Schematic Diagram: Motherboard (Sheet 1 of 3)

1 2 3 4 5 6 7 8 9 10 11 12

A

B

C

D

E

F

G

H

12

1110987654321

H

G

F

E

D

C

B

A

DWG. NO. REV.

E . C . N. REV DESCRIPTION

APPROVALS

PECHK CMDATE DWN

REVISION HISTORY

65

THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS
THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET OF

SCALE : NONE

PROJ NO.

FILENAME:

DWG . NO .

REV

TITLE:

UNCONTROLLED

UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
CONTROLLED COPY, COPIES OF THESE DOCUMENTS
INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.

APPROVALS
DWN
CHK

CM
PE

DISTRIBUTION

K

SIZE

D

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

A

03-08-07 DW DW

C16

.01

C17

.01

C18

.01

C19

.01

C20

.01

C21

.01

C22

.01

C23

.01

R28 220

C68

OPEN

C67

OPEN

C66

OPEN

R11 390

R12

390

R10 1K
R9 220

R13 100

R14 220

C5

.01

C6
.001

C7

.001C8.001C9.01

C10

.01

C58

.01

C59

.01

C60

.01

C62

.01

C64

.01

C65

.01

1
2
3

J13

HEADER 3X1

123

J2

OPEN

C3
220pFC4220pF

C13

220pF

C14

220pF

C15

220pF

C12

220pF

C11

220pF

R6
1K

R8
1K

R171KR181KR201KR161KR15

1K

R19
240

12345

HD6

OPEN

2

3

1

REF. FOR
XLR CON.

HI
LO
GND

SCA

EXT_RTN

EXT_IN

MON_L

MON_R

-12V

+12V

J18
MCX

J19
MCX

RF OUT

+5.00V

D1
1N4148

123456789

10

J26

HEADER 5 x 2

V+

TEMP

GND

R177

1K

R1761K

R150

1K

1
2
3
4
5
6
7
8
9
10

J25

HEADER 5 x 2

1
2
3
4
5
6
7
8
9
10
11
12

J6

HEADER 12

1
2
3
4
5
6
7
8
9
10
11
12

J7

HEADER 12

+5.00V

R IN2

R IN1

L IN2

L IN1

LPIN L

LPOUT L
LPIN R

LPOUT R

+12V

-12V

L VU

+5.00V

PROC A
PROC B

PROC C

R VU

BR GR

HI GR

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

J15

+12V

+12V

-12V

C159
.001

C158
.001

C157
.001

C140
.01

R216
1K

FM TP1

VOLTMETER

1
2
3
4
5
6

J14

HEADER 6X1 .156

+12V

C55

.01

C56

.01

C57

.01

Q3

IRF541

R7

300

R5

300

Z8

OPEN

Z7

OPEN

123

J1

XLR

C2

220pFC1220pF

R4
1K

R2
1K

R1

300

R3

300

Z3

OPEN

Z5

OPEN

Z4 OPEN

Z6 OPEN

Z1

JUMPER

Z2
JUMPER

J1

1
2
3
4
5
6
7
8
9
10
11
12

STEREO GENERATOR

J2

1
2
3
4
5
6
7
8
9
10
11
12

1
2
3
4
5
6
7
8
9
10

J8

HEADER 5 x 2

J3

1
2
3
4
5
6
7
8
9
10

+12V

-12V

SCA IN

EXT RTN

EXT IN

/EXT ENABLE

COMPOSITE1

MON R

MON L

LPIN L
LPOUT L
LPIN R
LPOUT R

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

J11

HEADER 10 x 2

J1

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

AUDIO PROCESSOR

1
2
3
4
5
6
7
8
9
10

J9

HEADER 5 x 2

J2

1
2
3
4
5
6
7
8
9
10

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

J10

HEADER 13 x 2

J3

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

+12V

-12V

/+6DB
/+12DB

+5.00V

COMP METER

COMP METER

COMP METER

STEREO/MON

STEREO/MON

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

J12

HEADER 10 x 2

ALC

ALC

ALC

ALC

ALC

FAN

TP4

+12V

+12V

TP3

-12V

-12V

TP5

+5.00V

+5.00V

TP7

GND

2

3

1

U1A

TL072

C24

1.0

+12V

C25

1.0

-12V

R32

24.9K
1%

R34 24.9K 1%

R36

24.9K
1%

R35

24.9K
1%

Z11

OPEN

EXT RTN

Z10

OPEN

R30

3.9K

5

6

7

U1B

TL072

R29
1K

EXT IN

R38 1K

Z14

OPEN

SCA IN

D2

1N4148

D3

1N4148

R37

4.02K
1%

R33
100

R31
100

Z12

OPEN

Z13

OPEN

COMP METER

COMPOSITE1

COMPOSITE1

STEREO GENERATOR SHUNT

NC

1

Vin

2

TEMP

3

GND4TRM

5

Vout

6

NC

7

NC

8

U2

REF02

+12V

C26

1.0

2

3

1

U3A

TL072

C29

1.0

+12V

C30

1.0

-12V

5

6

7

U3B

TL072

R39
100

C27
.01

R40

4.7K

C28

1.0

Z9

OPEN

+5.00V

AUDIO PROCESSOR SHUNT

-METER PAV

-METER PAI

-METER RFW

-METER PA TEMP

-METER BATT

-FAULT SUM

-/AUTO_CARR_OFF

-/CARR OFF

_FSK IN
_ALC

38 KHZ OUT

_/EXT ENABLE

L IN1

L IN2

R IN1

R IN2

R IN1

L IN2

R27 220

R26 220

R25 220

R24 220

R23 220

R22 220

R21 220

FAULT SUM

FAULT SUM

METER BATT

METER BATT

METER PATEMP

METER PATEMP

METER RFW

METER RFW

METER PAI

METER PAI

METER PAV

METER PAV

ALC

FSK IN

FSK IN

FSK IN

NC
NC

NC
NC

NC
NC

PAI

PAV

/LOCK FAULT

C61
.001

C63
.001

DC SUPPLY

TEMP

TEMP

INPUT

INPUT

FAN­+12V

FAN

V-METER

RFV

RF FWD

RF REV

/LOCK

FM_/LOCK

FM_/LOCK

NC

38KHZ38KHZ

NC

NC

NC

NC

NC

NOTES:
UNLESS OTHERWISE SPECIFIED:

1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL.

2. ALL CAPACITORS ARE IN MICROFARADS.

DW 10-05-06

DW 10-05-06

/EXT ENABLE

/EXT ENABLE

COMPOSITE METER

INPUT CONFIGURATION CHART

NON-OMNIA BOARD INPUT IMPEDENCE

Z1, Z2 ON
Z3, Z5, Z7, Z8 OFF
Z4, Z6 OFF

50 KOHM

Z1, Z2 ON
Z3, Z5, Z7, Z8 ON
Z4, Z6 OFF

600 OHM

OMNIA BOARD AES/EBU INPUT

Z1, Z2 OFF
Z3, Z5, Z7, Z8 OFF
Z4, Z6 ON

ANALOG LEFT/RIGHT

LEFT IN 1

LEFT IN 2

Z31
OPEN

Z32
OPEN

INSTALLED WHEN USING
AUDIO PROC. SHUNT CKT.

Z22 OPEN

Z21 OPEN

Z20 OPEN

Z19 OPEN

Z18 OPEN

Z17 OPEN

Z16 OPEN

Z15 OPEN

Z30

JUMPER

Z29

JUMPER

Z28

JUMPER

Z27

JUMPER

Z26

JUMPER

Z25

JUMPER

Z24

JUMPER

Z23

JUMPER

SCH, UNIVERSAL MOTHER BOARD

DP 10-05-06

DP

201497F-SCH

A

1

201207F-SCH A

1

14

2

15

3

16

4

17

5

18

6

19

7

20

8

21

9

22

10

23

11

24

12

25

13

J3

DB25_2X

FMV CONTROL-FMV CONTROL

FMV CONTROL

38KHZ

38KHZ

38KHZ

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

J29

FM

WR

PAI

PAI

PAV

PAV

N/C
N/C

/LOCK FAULT

/LOCK FAULT

DC SUPPLY

NC

/CARR_OFF

TEMP

/AUTO_CARR_OFF

TEMP

1
2
3

J28

HEADER 3X1

-COMPOSITE OUT

WR TP1

ANTENNA SWR

REM RAISE

REM LOWER

REM SWR

DC SUPPLY

EXT ALC CONTROL

RF_LVL

LOCK

E2
E3

E4

C54

1.0

123456789

10

J24

HEADER 5 x 2

R222

1K

RDS TX

RDS RX

+12V

WR

FM

V+
TEMP
GND

1
2
3

J25

HEADER 3X1

RF_LVL

LOC/REMOTE

ALC

RF EXCITER

201497F-SCH-SH3.SCH

ALC/METERING

201497F-SCH-SH2.SCH

FM_/LOCK

ALC

METER PAV

METER PAI

METER PATEMP

METER BATT

METER RFW

FAULT SUM

GND

+5.00V

/LOCK FAULT

DC SUPPLY

PAI

PAV

EXT ALC CONTROL

TEMP

FAN

V-METER

RFV

RF FWD

RF REV

INPUT

+12V

-12V

GND

FSK IN

LOCK

/LOCK

RF_LVL

LOC/REMOTE

ALC

COMPOSITE1

+12V

-12V

38KHZ
/CARR_OFF

/AUTO_CARR_OFF
INPUT

N/C
N/C
N/C
N/C
N/C
N/C

N/C

RF OUT

RF_LVL

-12V

+12V

R IN2

L IN1

FMV CONTROL

1
2
3

J16

HEADER 3

REM PWR CNTRL

TP6

+5V

+5V

PRODUCTION RELEASE

6-9 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

Schematic Diagram: Motherboard (Sheet 2 of 3)

DWG. NO.

REV.

H

G

F

E

D

C

B

A

12345 6789101112

H

G

F

E

D

C

B

A

12345 6 8 9 10 11 12

SHEET OF

SCALE : NONE

PROJ NO.

DWG . NO .

REV

TITLE:

SIZE

C

C_L_SHT2_A.DOT REV. A

NOTES:
UNLESS OTHERWISE SPECIFIED:

1. ALL RESISTORS ARE IN OHMS, 1/4 W, 5% TOL.

2. ALL CAPACITORS ARE IN MICROFARADS.

PAI LIMIT

RF POWER (RFV SQUARED)

RF POWER
SWR
ALC
PA DCV
PA DCI

1.00V

FM_/LOCK

ALC

FAULT SUM

SWR LAMP

PADC LAMP

LOCK LAMP

SEL A
SEL B
SEL C

DPM IN

RF FWD

DC SUPPLY

RF REV

RF FWD

SEL A
SEL B
SEL C

DPM REF

SWR LAMP

PADC LAMP
LOCK LAMP

+5.00V

DPM IN

+12V

-12V

-12V

+5V

+12V

+5V

+12V

-12V

VCC

VSS

VDD

VEE

-12V

+12V

-12V

+12V

POWER CAL

+5V

.001V per Watt

+5V

FULL SCALE

1999 WATTS

19.99

19.99V

199.9V

19.99A
PA TEMPERATURE
SUPPLY DC VOLTS
VOLTMETER

199.9V

199.9V

1mV/Degree C

10mV/Volt
100mV/Amp

10mV/Volt

10mV/Volt

VOLTMETER

199.9 Deg. C

10mV/Deg. C

5.00V = 100 deg. C

1.00V = 10.0A

1.00V = 10VDC

INPUT

(1.999V reads "1999")

INPUT LAMP

+5V

(Clamp SWR reading

(2.5VDC at 100W)

(1.00V at 100W)

(.135V)

INPUT LAMP

PATEMP LAMP

PATEMP LAMP

RF_LVL

FAN

TEMP OUT

METER PATEMP

METER RFW

METER BATT

-12V

-12V

-12V

J22-1

J1-2

J1-4

J2-3

J2-6

J2-7

J2-8

J2-9

J2-10

J2-11

J22-12

J3-2
J3-4
J3-6

J30-19

J23-8

J2-7

J4-6

J4-5

J30-16

J30-18

J30-12

J30-14

J30-20

J3-9,10

-12V -12V
+12V+12V

+12V

-12V

-12V

U8,9 pin 7

+5.00V

+5.00V

+5.00V

+5.00V

/LOCK FAULT

-6.9V

-6.9V

+5V

PAV

J23-1

J4-12

PAI

50mv per degree C.

C132

.001

C152
.001

C155

0.1

C124

.01

C123
.01

C153

0.1

D35

1N6263

C142

.001

C130

1.0
C133

1.0

C139

1.0

12

13

14

U22D

TL074

5

6

7

U22B

TL074

3

2

1

4 11

U20A

TL074

12

13

14

U20D

TL074

10

9

8

U22C
TL074

10

9

8

U20C

TL074

5

6

7

U20B

TL074

C117

0.1

C160

0.1

C121

0.1

C129
.001

C131
.001

D36

1N6263

C134
.001

D38

1N6263

5

6

7

U24B

TL074

C135

.01

10

9

8

U24C

TL074

10
9

8

U23C

TL074

C143

1.0

12

13

14

U24D

TL074

C128

1.0

C156

1.0

C119

.01

C141

1.0

C120

0.1

D29

1N4148

3

2

1

4 11

U24A

TL074

D39

1N4148

D37

1N4148

D34

1N4148

3

2

1

4 11

U23A

TL074

5

6

7

U23B

TL074

D33

1N4148

D30

1N4148

D32
1N4148

C154
.001

D47 1N4148

D44

1N4148

D43

1N4148

D46

1N4148

D42

1N4148

D45

1N4148

D40

1N4148

D31

1N4148

3

2

1

4 11

U22A

TL074

12

34

56

78

910

J26

C118
.01

R142
100

R162

10.0K

R161
100K

2
3

1

U19A
TL072

5

6

7

U19B
TL072

R163

1.1K

R153

2.49K

R144

100

R195

10K

R186
33K

R194

15K

R187

2.2M

R175120K

R193
100K

11 10

U25E

74HC14

13 12

U25F

74HC14

9 8

U25D

74HC14

1 2

U25A

74HC14

3 4

U25B

74HC14

5 6

U25C

74HC14

R220
10K

R196 10K

R219
51K

R217 100K

R218 10K

R185
200K

R184
1K

R156
100K

R155 11K

R191
51K

R152
100K

R190
100K

R136
1K

R171 100K

R170

24.9K

R149 100

R182

80.6K

R183
240K

R165
100K

R164
1M

R169
10K

R167

30.1K

R181

240K

R166

220K

R158
100K

R160

68.1K

R157

1M

R55
10K

R188
33K

R151 120K

R154 120K

R189

1M

R135
100K

R173
10K

R146

100

R174

1.1K

R137
100K

R168
1K

R140
10K

R198
22K

R197

100K

R178 1K

R139

10K

R138
10K

R199
22K

R200
100K

R203
100K

R205
10K

R215
10K

R204
22K

1
2
3
4 5

6

7

8

Q7

LM394

1
2
3
4 5

6

7

8

Q6

LM394

R207

3.3K

R213

49.9K

R211

49.9K

R209

7.5K

R208

10.0K

R210

1.1K

R148

100

R206
39K

R202
1K

R201

1M
R180
3K

R172
100K

Vin

3

GND

2

Vout

1

VR4
78L05

R214

3.3K

D48

LM329DZ

12
34
56
78
910
1112
1314
1516
1718
1920

J30

HEADER 10X2

R221

10.0K

R212

2.49K

X0

13

X1

14

X2

15

X3

12

X4

1

X5

5

X6

2

X7

4

INH

6

A

11

B

10

C

9

X

3

VCC

16

GND

8

U21

74HC4051

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

D41

1N4148

R141100K

1%

2

3 1

Q5
2N5210

2

FM U5

ALC

METER PAV
METER PAI

METER RFW

METER PATEMP

METER BATT

FAULT SUM

/LOCK FAULT

DC SUPPLY

J22-5

EXT ALC CONTROL

R68
10K

R64

10K

-12V

+12V

R63
10K

R60

10K

R58
10K

2
3

1

U9A

MC33282

5

6

7

U9B

MC33282

C44
.01

C47
.01

R62
10K

R179
1K

1
2
3
4 5

6

7

8

Q1

LM394

1
2
3
4 5

6

7

8

Q2

LM394

R59

3.32K

R57

3.32K

R61

49.9K

-5V

R66
10K

SWR CAL

C49

20pF

R65

5.11K

C51
.001

R69
10K

R70

1.15K

R67
100

REM SWR

SW1

SW-PB

SW2

SW-PB

R43

51.1K

R44

51.1K

+5V

+5V

1
2

3

U4A

74HC132

4
5

6

U4B

74HC132

9

10

8

U4C

74HC132

12
13

11

U6D

74HC132

below 5W.)

R49
1K

R48
1K

C41
.001

+5.00V

5

6

7

U8B

TL074

D11

1N753A

C42
.001

D12

1N4148

12

13

14

U8D

TL074

10

9

8

U8C

TL074

3

2

1

4 11

U8A

TL074

C43
.001

D13

1N4148

C39
.001

D10

1N4148

R51

3.32K

+12V

123

SW8
SWITCH

LOCAL ONLY

RF_LVL

POWER SET

-12V

+12V

6.2V

R143
100

R145
100

+

C127

47/20V

+

C125

47/20V

1%

R192

3.16K

R159

*

123

SW10

SWITCH

M1/M2

POWER SET

POWER SET

R159 = 19.6K 1%

ALL FM

R159 = 187K 1%

WR

R159 = 200K 1%

POWER SET

1%

1%

+

C126
47/20V

R147

100

C53

1.0

C52

1.0

Vin

2

GND

1

Vout

3

VR1

LM7905

-12V

-5V

OPEN FOR FM30 UNITS

FM_/LOCK

C32

.01

C35

.01

-12V

C40

.01

+12V

C45

.01

+12V

C46

.01

-12V

C48

.01

C50

.01

2
3

1

U10A

TL072

5

6

7

U10B
TL072

4

8

12

13

14

U23D

TL074

+

C122

10/35V

TANT

1 2

JP5

REM RAISEREM LOWER

INPUT

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

INC

1

U/D

2

H

3

GND4W

5

L

6

CS

7

Vcc

8

U5

DS1804

+5V

12
13

11

U4D

74HC132

R47

51.1K

C33

.01uF

R52
100K

R54
100K

1
2

3

U6A

74HC132

C38
.01uf

C37
.01uF

R56
100K

+5V

4
5

6

U6B

74HC132

9
10

8

U6C

74HC132

REM PWR CNTL

+

C34

4.7uF

1%

TANT.

OPEN

LADRVRALL OTHERS

SCH, UNIVERSAL MOTHER BOARD

201497F-SCH

A

201497F-SCH A

3

Adjustments and Tests 6-10

Schematic Diagram: Motherboard (Sheet 3 of 3)

DWG. NO.

REV.

H

G

F

E

D

C

B

A

12345 6789101112

H

G

F

E

D

C

B

A

12345 6 8 9 10 11 12

SHEET OF

SCALE : NONE

PROJ NO.

DWG . NO .

REV

TITLE:

SIZE

C

C_L_SHT2_A.DOT REV. A

FM_/LOCK

+12V

+5V

+5V

TP1

+8V

88-108 MHZ

COMPOSITE1

+8V

CLK

DATA

LOAD

8.26V

+8V

+5V

LF SEP.

CLOCK

DATA

/ENABLE

OSC in

Fin

VDD

VDD

+5V

+12V

VVCO

FSK

+5V

CH. SEL.

DIRECT FSK

+5V

LOCK DET.

+5V

VU5

VU5

+12V

FSK IN

LOC/REMOTE

Frequency Select

ID

AUTO ID

BAND LIMIT

TP

DS1

GREEN

DS2
RED

IN

3

C

2

OUT

1

VR2

LM317

12345

SW3

12345

SW5

12345

SW4

12345

SW6

12345

SW7

IN

3

C

2

OUT

1

VR3

LM78L05

SW9
RESET

SER10A11B12C13D14E3F4G5H

6

QH

9

CLK

2

QH

7

INH15SH/LD

1

U18

OPEN

SER10A11B12C13D14E3F4G5H

6

QH

9

CLK

2

QH

7

INH15SH/LD

1

U17

OPEN

12345678910

J20

OPEN

1

2

3

4

5

6

7

8

9

10

RP1

OPEN

1

2

3

4

5

6

7

8

9

10

RP2

OPEN

R129

10.0K

RA2

1

RA3

2

RTC

3

CLR

4

VSS

5

RB0

6

RB1

7

RB2

8

RB39RB4

10

RB5

11

RB6

12

RB7

13

VDD

14

OSC2

15

OSC1

16

RA0

17

RA1

18

U16

PIC16C61

R119

10.0K

R72

1K BECKMAN

R125

68K

R127
25K

R81

150

R108
680

R107
680

R100

100K

R74
237

R73

1.27K

C116
.001 POLY

C80

100PF

C79
.001

C74
.001

C75
.001

C108

3900PF

C98

.001

C90
.001

C77
.001

C95

.001

C97
.001

C76
.001

D28

OPEN

D26

OPEN

D24

1N4148

D27

1N4148

D21 1N4148

D17

1N6263

R115
100K

R109
100K

D22
1N4148

C69
100PF

9 8

U15D

74HC14

5 6

U15C

74HC14

13 12

U15F

74HC14

11 10

U15E

74HC14

34

U15B

74HC14

12

U15A
74HC14

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

16

16

15

15

14

14

13

13

12

12

11

11

10

10

9

9

U13

MC145170

D23

1N4148

2 1

3

A2

MAR-6

C81
.001

R123
39

123456

78

VCO1
POS-150

DS3

AMBER

1 2

3 4

5 6

7 8

9 10

J20

HEADER 5X2

R97

OPEN

R120

1.0K

C89

33pF NPO

R106 10

C73
.001

C103 .001

C104

1

C107

.001 POLY

R98
100K

R105
100K

R114
100K

R111

100K

R99
100K

R104
100K

R116
100K

R222

1.0K

R112

100

R113

10.0K

R124 1M

R13210.0K

R13310.0K

R13410.0K

R11810.0K

R11710.0K

R103
1M

R102

200K

C111

0.01

R87 499K

D25

1N4148

R131
150K

D19

1N4148

R96
150

R95

15

R86
499K

21

3

A1

MAR-6

R80

15

R79
100

R88
100

D15

1N4148

C112

220pF

R122 4.99K

2
3

1

411

U14A

MC33284P

6
5

7

U14B

MC33284P

9
10

8

U14C

MC33284P

13
12

14

U14D

MC33284P

2
3

1

84

U12A

NE5532

5

6

7

U12B

NE5532

+5V

8

9

C92

1

C102
1

C106
1

C109
1

C99
1

C83
1

C113 1

2

3

1

8 4

U11A

TL072

5

6

7

U11B

TL072

C86

0.1

C87

0.1

C94 0.1

-12V

+12V

R93
2K

PWR. CNTRL. OFFSET

C88 0.1

-12V

R78
10K

Q4

IRFD9120

G

S

D

D14

3.9V

TP2

4.5 - 8.0V

1

2

Z34
JUMPER

C78
.01

PWR. CNTRL TILT

+8V

R75

24.3K 1%

R76

30.1K 1%

R84

26.7K 1%

R85

24.3K 1%

R94

499 1%

R92

680.0

D16

6.2V 1N753A

R77

10.0K

C85

1000pF

R83

5.11K 1%

R82

5.11K 1%

C84

0.1

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

+

C110
47/20V

TANT.

+

C91
10/35V

TANT.

+

C105
10/35V

TANT.

+

C114
10/35V

TANT.

+

C72
10/35V

TANT.

+

C70
10/35V

TANT.

+

C71

10/35V

TANT.

+

C82

10/35V

TANT.

POLY

POLY

R89

100

RF_LVL

RF_LVL

D20

1N5353B

16V

R110
2K

2W

DC SUPPLY

VU5

123

SP4

FMWR

123

SP3

FM WR

FMWR

1

2

3

SP2

1

2

3

SP1

FM

WR

FSK-R

FM_/LOCK

LOCK

FM_/LOCK

RF OUT

COMPOSITE1

LOC/REMOTE

FSK IN

R71

OPEN

R
NOT USED

+12V

VU5

CV

1

OUTPUT

8

+VDD

14

GND

7

Y1

5V_TCXO

+5V

VU5

FSK-R

C101
100pF

OPEN OPEN OPEN OPEN OPEN

1
2
3
4
5
6
7
8
9
10

J31

HEADER 10

+5V

TO

FREQUENCY SELECTION PWA

LOCATED ON FRONT PANEL

J1 OF 201508F-PWA

R224
10K

R101

50K

FREQ. ADJ.

OFFSET
FREQ. ADJ.

SCH, UNIVERSAL MOTHER BOARD

201497F-SCH

A

33

201497F-SCH A

6-11 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

DWG. NO.

REV.

1234

F

D

E

C

B

A

1234

F

D

E

C

B

A

SHEET OFSCALE : NONE PROJ NO.

FILENAME:

DWG . NO . REV

TITLE:

APPROVALS

DWN

CHK

CM
PE

DISTRIBUTION

THESE DRAWINGS AND SPECIFICATIONS
ARE THE PROPERTY OF INTERNATIONAL
RADIO AND ELECTRONICS CORP. AND
SHALL NOT BE REPRODUCED, COPIED OR
USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS
OR DEVICES WITHOUT PERMISSION.

UNCONTROLLED

UNLESS OTHERWISE MARKED IN RED INK
BY CM AS A CONTROLLED COPY, COPIES
OF THESE DOCUMENTS INCLUDING
ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.

E . C . N. REV DESCRIPTION

APPROVALS

PECHK CMDATE DWN

REVISION HISTORY

A_P_SHT1_A.DOT REV. A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

SIZE

A

12345

SW1

12345

SW3

12345

SW2

12345

SW4

12345

SW5

SER10A11B12C13D14E3F4G5H

6

QH

9

CLK

2

QH

7

INH15SH/LD

1

U2

74HC165

SER10A11B12C13D14E3F4G5H

6

QH

9

CLK

2

QH

7

INH15SH/LD

1

U1

74HC165

1

2

3

4

5

6

7

8

9

10

RP1

100K RPACK

1

2

3

4

5

6

7

8

9

10

RP2

100K RPACK

D1
1N4148

1
2
3
4
5
6
7
8
9
10

J1

HEADER 5 x 2

+5V

201508F-SCH

SCH, FM FREQUENCY SELECTION

551 1

A

A

PRODUCTION RELEASE

03-08-07

DW DW

DP

DW

11-14-06

DW

11-14-06

DP

11-14-06

Illustration 6-7 FM Frequency Selection Board (Top-Side)

Illustration 6-8 FM Frequency Selection Board (Bottom-Side)

Schematic Diagram: FM Frequency Selection

Adjustments and Tests 6-12

Illustration 6-9 FM Display Board

6-13 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

DWG. NO.

REV.

H

G

F

E

D

C

B

A

12345 6789101112

H

G

F

E

D

C

B

A

12345 6 8 9 10 11 12

E . C . N. REV DESCRIPTION

APPROVALS

PECHK CMDAT E DWN

REVISION HISTORY

THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS
THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET

OF

SCALE : NONE PROJ NO.FILENAME:

DWG . NO .

REV

TITLE:

UNCONTROLLED

UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
CONTROLLED COPY, COPIES OF THESE DOCUMENTS
INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.

APPROVALS
DWN
CHK
CM
PE

DISTRIBUTION

K

SIZE

C

C_L_SHT1_A.DOT REV. A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

SWR

50mA

UP

DOWN

SWR

ALC

RF POWER

10V P-P DITHER

PA DC VOLTS

PA DC AMPS

SUPPLY DC VOLTS

"110"

"PILOT"

19.99

19.99

199.9

199.9

199.9

19.99

F.S.

DECIMAL POINT

DITHER

L VU
R VU

HI GR

BR GR

PROC A
PROC B
PROC C

/+6DB

/+12DB

L VU

/+6DB

/+12DB

DPM IN

DPM REF

MON/ST

SWR LAMP

PADC LAMP
LOCK LAMP

+12V

+5V

+5V

+12V

+12V

-12V

5.00V

5.00V

+5V

+12V

5.00V

+5V

+12V

COMPOSITE

+12V

5.00V

-12V

+12V

COMPOSITE

+5V

+12V

+12V

-12V

+12V

-12V

-12V

+12V

VCC

14 16

U10
U11

U9

7

8

VEE
VSS

VDD

-12V

STEREO

MONO

MOD. CAL.

1999

FOR BAR

DL36-43

DL21-25

DL1-10

DL48-58

DL26-35

RF LEVEL

5.00V

DL44-47, 59

+12V +12V

-12V

5.00V 5.00V

5.00V 5.00V

SEL A
SEL B
SEL C

+12V

PA TEMPERATURE

19.99VOLTMETER

INPUT

PATEMP LAMP

Pin 1, upper left from front of unit.

LOCK

INPUT

PA DC

PA TEMP

NOTES :

1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL.

2. ALL CAPACITORS ARE IN MICROFARADS.

RED

GRN
GRN

GRN

GRN

GRN

GRN

GRN

RED

C2

1.0UF

C7

0.1

C8
.001

RED

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

GRN

C11

0.1

Q3

2N5210

Q4

2N5087

C25

0.1

C30

1.0UF

C31

1.0UF

C28

1.0UF

C10

0.1

GRN

YEL

Y

Y

G

G

G

G

G

G

Y

YEL

D1
1N4148

D2

1N4148

3

2

1

8 4

U6A

TL072

5

6

7

U6B

TL072

3

2

1

8 4

U7A

TL072

5

6

7

U13B

TL072

C12
.001

D6

1N6263

C22

1.0UF

C26

1.0UF

12
34
56
78

910
1112
1314
1516
1718
1920

J1

HEADER 10X2

12

34

56

78

910
1112
1314
1516
1718
1920

J2

HEADER 10X2

RED

SW5

C1

1.0UF

3

2

1

8 4

U1A

TL072

Q1
MPS-A56

D5

1N6263

5

6

7

U7B

TL072

3

2

1

8 4

U13A

TL072

C13

.01

C24

1.0UF

C29

1.0UF

C23

1.0UF

SW6

C20
.01

C32
.001

C21
.01

C33
.001

C34

1.0UF

1

2

JP3

JUMPER

SW1

DPDT

SW2
DPDT

SW3
DPDT

GRN

C5
.001

C6

0.1

1

2

JP1
OPEN

L1

1

V-

2

V+

3

DLO

4

IN

5

DHI

6

ROUT

7

RADJ

8

MODE9L10

10

L9

11

L8

12

L7

13

L6

14

L5

15

L4

16

L3

17

L2

18

U2

LM3915

R3
1K

DL44 RED

DL45 RED

R2

100K

DL46 RED

R1
68K

DL47 RED

DL59 RED

R4

1.2K

R VU

+12V

5.00V

+12V

DL11-20

RED

GRN
GRN

GRN

GRN

GRN

GRN

GRN

RED

C4

1.0

YEL

D3

1N4148

D4

1N4148

C3

1.0

5

6

7

U1B

TL072

Q2
MPS-A56

1

2

JP2
OPEN

L1

1

V-

2

V+

3

DLO

4

IN

5

DHI

6

ROUT

7

RADJ

8

MODE9L10

10

L9

11

L8

12

L7

13

L6

14

L5

15

L4

16

L3

17

L2

18

U3

LM3915

L1

1

V-

2

V+

3

DLO

4

IN

5

DHI

6

ROUT

7

RADJ

8

MODE9L10

10

L9

11

L8

12

L7

13

L6

14

L5

15

L4

16

L3

17

L2

18

U4

LM3914

L1

1

V-

2

V+

3

DLO

4

IN

5

DHI

6

ROUT

7

RADJ

8

MODE9L10

10

L9

11

L8

12

L7

13

L6

14

L5

15

L4

16

L3

17

L2

18

U5

LM3914

R18 1.2K

R17

1K

R16
33K

R13

1K

R141.2K

R15

33K

R7

68K

R8

100K

R9

1K

R10

1.2K

R12

330

R11

1K

R5
1K

R6

330

R31

5.6K

R32
620

R33
33K

R34

5.1K

L1

1

V-

2

V+

3

DLO

4

IN

5

DHI

6

ROUT

7

RADJ

8

MODE9L10

10

L9

11

L8

12

L7

13

L6

14

L5

15

L4

16

L3

17

L2

18

U8

LM3914

R52 5.6K

R272.7K

R48 1K

R29
680

R43

3.3M

R47
1K

R46
10M

R45
100

R44
33K

R25
10K

R49
10K

R55

4.7K

R53
1K

R24

1M

R23

10.0K

R22

10.0K

-12V

R26
33K

11223344556677889

9

101011111212131314141515161617171818191920

20

212122222323242425252626272728282929303031313232333334343535363637373838393940

40

1000 100'S TENS UNITS

DL101

DISPLAY

11223344556677889

9

101011111212131314141515161617171818191920

20

212122222323242425252626272728282929303031313232333334343535363637373838393940

40

U12
ICL7107

+5V

+5V

+5V

X41X6

2

X

3

X74X55EN6VEE7GND8C9B10A11X312X013X114X2

15

VCC

16

U11

74HC4051

+5V

R30
150

C19
100PF

R38
100K

C18

0.1

R37
470K

C16

0.1

C17

0.1

-12V

C27

1.0UF

DZ1

6.2V

C14

0.1

C15

0.1

R57

1K BECKMAN

1 2

U9A

74HC14

CLR

14

UP

5

DOWN

4

LOAD

11

CO

12

BO

13

A

15

QA

3

B

1

QB

2

C

10

QC

6

D

9

QD

7

U10

74HC193

3 4

U9B

74HC14

R41
10K

R42
10K

R28
1K

R54
1K

R40
100K

R39
100K

R36
100K

R35
100K

R19

510

1213

U9F

74HC14

R20

220K

C9

1.0UF

5.00V

5.00V

COMPOSITE
R VU
L VU

+12V

-12V

5.00V 5.00V

Vin

1

GND

2

Vout

3

VR1
7805

+12V

-12V -12V

HI GR

DITHER

BR GR

+12V

DP10
DP100

+5V

5 6

U9C

74HC14

89

U9D

74HC14

1011

U9E

74HC14

R51

2.2K

UNLESS OTHERWISE SPECIFIED:

Y

G

G

G

G

50mA

D16

1N4148

D17

1N4148

D7

1N4148

MOD. CAL.

D18

1N4148

R56
220

+5V

R50

100K BECKMAN

SCH, FM/IBOC DISPLAY

DW

09-20-04

G REDRAWN ON IREC FORMAT AND PWB CHG. TO REV. C 09-20-04 DW

1%

1%

336

DW

R58
0

Q43113-2F

H

Q43113-2F H

H PWA, PWB CHG'D TO ROHS 07-24-06 DW475

DW

Schematic Diagram: FM Display

Adjustments and Tests 6-14

Illustration 6-10 FM Voltage Regulator

6-15 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

DWG. NO.

REV.

H

G

F

E

D

C

B

A

12345 6789101112

H

G

F

E

D

C

B

A

12345 6 89101112

E . C . N. REV DESCRIPTION

APPROVALS

PECHK CMDATE DW N

REVISION HISTORY

THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS
THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET

OF

SCALE : NONE PROJ NO.FILENAME:

DWG . NO .

REV

TITLE:

UNCONTROLLED

UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
CONTROLLED COPY, COPIES OF THESE DOCUMENTS
INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.

APPROVALS
DWN
CHK
CM
PE

DISTRIBUTION

K

SIZE

C

C_L_SHT1_A.DOT REV. A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

5 6

U3C

74HC14

3 4

U3B

74HC14

CIN

11

COUT

9

COUT

10

RST

12

Q4

7

Q5

5

Q6

4

Q7

6

Q8

14

Q9

13

Q10

15

Q12

1

Q13

2

Q14

3

VCC

16

GND

8

U2

74HC4060

3

2

1

4 11

U1A

TL074

12

13

14

U1D

TL074

C1
.01

C5

1.0

C3

.001

R1

4.7K

R33

4.7K

R2

10.0K

1 2

U3A

74HC14

R3

4.7K

R4

10.0K

VDD

C2

.001

R7
120K

R6

5.1K

-12V

+12V

R5
91K

R10
75K

C4
.001

D3

1N6263

D4
1N6263

D2

1N4148

D1
1N4148

R8
51K

R11
100K

R13
100K

R9

1.0K

R12

1.0M

R14

220.0

5

6

7

U1B

TL074

+12V

R15

2.2K

R16

10.0K

R17

10.0K

D6

1N4148

DL2
RED

DL1

GREEN

10

9

8

U1C

TL074

R19

10.0K

R20

10.0K

R18
100K

R21

24.9K

C6

1.0POLY
POLY

VDD

12
34
56
78
910

JP1

HEADER 5X2

D7

1N4148

INPUT FAULT

D8

1N4148

R22
100K

9 8

U3D

74HC14

13 12

U3F

74HC14

11 10

U3E

74HC14

DZ1
1N4735

R23

1.0K

+12V

VDD
VCC

VSS

+6V

C8

220pF

C7
.001

R25
100K

R26
100K

R48

10.0K

R27

620.0

R49

1.5K

12345

6

HD1

12345678910

1112

1314

1516

1718

1920

HD2

HEADER 10X2

123

HD3

1

2

3

4

5

6

HD4

HEADER 6

VDD VDD

D9

OPEN

-12V

+12V

CARR SW
DRVR V+

R51

(JUMPER)

+12V

COMP2
38KHZ
/CARRIER OFF
/AUTO CARRIER

SYNC

-12V
DRVR V+
PAV
PAI
ALC

D15

1N4004

/LOCK FAULT

R50
100

INPUT FAULT

+UNREGMETER UNREG

(TO POWER REG. BOARD)

FAN

C9
2200Pf

POLY

GND

4

OSC

3

+IN

2

-IN1V+

8

CS

7

C

6

E

5

U4

LM3578

ESS

4

ERR

3

IN

2

VCC1VB

8

OUT

7

CS

6

VS

5

U5

IR2125

C11
.01

R28
68K

C10

56Pf
NPO

R30

2.2K

C13
100Pf

C12

1.0
C14
.1

D10

1N4148

Q5

MPSA06

DZ2
1N966B

R24

100.0

R34

10.0K

+

C23
330/100V

Q1
IRF540

C15

0.1

R36

2.0K

R37

2.2K

R38

1.0

D11
MUR120

R38A

1.0

+UNREG

P1

L1

380UH

R32

SEE NOTE 3

R29

4.12K

L2

960UH

R45

10.K

D13
1N5822

R44

1.1K

+

C24

10/35V

+

C20

1800/35V

L3
960UH

D14

1N5822

+

C21

220/63V

L4

960 uH

+

C22

3300/16V

-12V

+12V

+12V

-12V

+

C18

220/63V

DZ3 1.5KE36A

DZ4
ICTE-12

Q2
MPSA06

R39 510

R40

10.0

Q3

MPSA56

Q4

MJE15028

+

C19

1000/35V

C28
1

R43

220.0

R41

1.0K

R42

1.0K

+

C25
220/63V

DRVR V+

CARR SW

/CARRIER OFF

/AUTO CARRIER

COMP2

AUDIO or COMPOSITE

VDD

1%

TIME-OUT SELECT

6.2V

1%

0.5W 0.5W

NOTES:

UNLESS OTHERWISE SPECIFIED:

1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL.

2. ALL CAPACITORS ARE IN MICROFARADS.

3. FOR FM30, 100 & 250 UNITS, R32 VALUE = 82.5K OHM, 1/4W, 1% TOL..

Q43229-6F

PROGRAM DETECT

R35

51.0

C26 0.1

C27

0.1

C16

OPEN

Vin

2

GND

1

Vout

3

VR1 OPEN

1
2

JP2

OPEN

Vin

1

ON/OFF

5

FEEDBACK

4

OUT

2

GND

3

U6

LM2576-ADJ

FM 30/100/250 = D 6977-9

FM 30/100/250 = C 8667-5

FM 30/100/250 = C 7746-8

1%

1%

1%

.5
2
4
8

FOR HARRIS UNITS, R32 VALUE = 100K OHM, 1/4W, 1% TOL.

C29

56Pf
NPO

AF475 REDRAWN ON IREC FORMAT. PWA & PWB NOW RoHS 9-14-06 DW DW

DP

DW

9-14-06

SCH, FM VOLTAGE REGULATOR

AG

AG493 CORRECTED PWB TO CONNECT R29 2-19-07 DW DW

DP

Schematic Diagram: FM Voltage Regulator

Adjustments and Tests 6-16

Illustration 6-11 FM Power Regulator

6-17 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

DWG. NO. REV.

1234 78

A

B

C

D

E

F

1 234 678

A

B

C

E

F

5

THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF
INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS
FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET

SCALE : NONE

PROJ NO.

FILENAME:

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TITLE:

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UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
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INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
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APPROVALS

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CM

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DISTRIBUTION

E . C . N. REV DESCRIPTION

APPROVALS

PECHK CMDATE DWN

REVISION HISTORY

65

SIZE

B

B_L_SHT1_A.DOT REV.

A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

~

~

-

+

DC INPUT

TP1

TP2

ON CHASSIS

NOTES:

UNLESS OTHERWISE SPECIFIED:

1. ALL RESISTORS ARE IN OHMS,
1/4W, 5% TOL.

2. ALL CAPACITORS ARE IN MICROFARADS.

533

BATTERY

CIRCUIT BREAKER

110V

DW 09-30-03

R801B

24.9K

R801A

27.4K

1 2

Z7

1 2

Z6

1 2

Z9

1 2

Z8

12

Z1

12

Z2

R806A

330K

R805A

330K

R806B

200K

R805B

200K

D805

1N4148

R820
100K

R804

10.0K 1%

123

D803
BYV72EW-150

123

D804

BYV72EW-150

D802
1N4148

R811

ESS

4

ERR

3

IN

2

VCC1VB

8

OUT

7

CS

6

VS

5

U2

IR2125

GND

4

OSC

3

+IN

2

-IN1V+

8

CS

7

C

6

E

5

U801

LM3578AN

1

2

3

R802
10K

DZ801

1N966B 16V

DZ802

1N966B 16V

1 2

Z4

1 2

Z5

L801
30UH

L803
30UH

L802

*

Q801
IRF540

R808

1.0K

R809

51.0

R807

2.2K

R803

82K

R810

2.0K

R812A

0.1

R812B

0.1

DZ803
1N4735 6.2V

R821

10.0K

R818A

2.0K

R818B

2.0K

+

C815

330/100V

+

C816

330/100V

+

C817
330/100V

+

C810

330/100V

+

C811

330/100V

Q804
MPSA06

3

2

6

1

8

74

U803
OP-27GNB

Q802
MPSA56

R814

22.0K

Q803
2N5087

R822

22.0K

R816

1.0K 1%

R813

1.0K

R815

100.0

R819

.04 OHM 15W 3%

R817B

2K

R817A

100

C1001

0.015F

C802

2200PF POLY

C801
220PF

C814

1/50V

C804

.01

C803

56PF

C813

.01UF

C819
.01UF

C820

0.01UF DISK

C809
.1

C818

.1UF

C805
100PF

C812

1/50V

C808
.0027

+

C806

4.7UF/63V

1
2
3
4
5
6

HD1

C 7527-2_6 HDR

P801
FASTON TAB

P802
FASTON TAB

P806
FASTON TAB

P803
FASTON TAB

P804
FASTON TAB

P805
FASTON TAB
P807

FASTON TAB

P808

FASTON TAB

PA-DC OUT

+ UNREG IN

C10582-2C10582-2C10582-2C10582-2

A PRODUCTION RELEASE 10-31-03 DW

R827

1.0K

1 2

Z3

DZ806
1N4735 6.2V

2W

2W

5W 5W

DZ807

1N966B 16V

R828
30K

REF DES

FM1

UNIT CONFIGURATION

SHORT

FM30 FM100 FM250 FM500

L802

OPEN

OPEN

OPEN OPEN

OPEN

OPEN OPEN

SHORT

SHORT

OPEN OPEN OPEN
OPEN OPEN SHORT SHORT SHORT
SHORT SHORT OPEN OPEN OPEN
SHORT SHORT SHORT SHORT OPEN
OPEN

OPEN

OPEN SHORTOPEN

H43608-1 H43395-5 H43533-1

H43533-1 H43533-1

*

*

*

*

*

*

*

*

*
*

*
*

*

2W

*

*

PA VOLTAGE SET

JUMPER

Z1

SHORT SHORT SHORT

Z2

SHORT

Z9

SHORT SHORT SHORT

Z8
Z7
Z6
Z4
Z5

Z3

SHORT SHORT SHORT SHORT SHORT

EURO

SHORT

OPEN

OPEN

OPEN

OPEN
SHORT

SHORT

SHORT

SHORT

H43533-1

HARRIS M1

SHORT

OPEN

OPEN

OPEN

OPEN
SHORT

SHORT

SHORT

OPEN

H43533-1
R811 5.11K 1%3.3K 3.3K 3.3K3.3K3.3K
R827
R828
DZ806
DZ807

OPEN
OPEN
OPEN
OPEN

OPEN
OPEN
OPEN
OPEN

OPEN
OPEN
OPEN
OPEN

OPEN
OPEN
OPEN
OPEN

OPEN
OPEN
OPEN
OPEN

OPEN
OPEN
OPEN
OPEN

INSTALLED

3.3K

HARRIS M2

OPEN

SHORT

OPEN

OPEN

SHORT
SHORT

SHORT

OPEN

OPEN

H43533-1

3.3K

INSTALLED
INSTALLED INSTALLED
INSTALLED INSTALLED
INSTALLED INSTALLED

DW 09-30-03
DP 09-30-03

200915-SCH

DW DP

B CORRECTED Z3 AND Z6 UNIT STATUS FOR M2 AND FM100 01-29 -04 DW DW DP

274

C SW APPED Z1, Z2 TO MATCH PWB 08-10-04 DW DW323 DP

FM POWER REGULATOR

200915F-SCH

D

D PWA & PWB NOW RoHS. CHG'D P/N 07-25-06 DW DW475 DP

Schematic Diagram: FM Power Regulator

Adjustments and Tests 6-18

R19

Illustration 6-12 FM Power Amplifier FM150/FM300

6-19 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

DWG. NO. REV.

1234 78

A

B

C

D

E

F

1 234 678

A

B

C

E

F

5

THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF
INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS
FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET

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E . C . N. REV DESCRIPTION

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PECHK CMDATE DWN

REVISION HISTORY

65

SIZE

B

B_L_SHT1_A.DOT REV.

A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

1

2

3

R11
10K

R12

5.6

R13

5.6

R14

5.6

R15

5.6

R17

24, 3W

R16

10, 1/8W

C14
.01

C15
.01

C12

.01

C13

.01

C01
.01

C24
.68

C23
.01

C26
.01

C25

55pF

T21

G2 D2

S

G1 D1

Q01

SD2942

PA DC

C22

0.1

L21

50NH

L22
50NH

J02
BNC RECEPT.

J01

BNC RECEPT

T11S

T1111P

C21
.01

R01
15K

PA OUTPUT

C10
.01

R10
12K

R19
200

3W

PA INPUT

DZ10

6.2V

R18

2.7K

LB01

BEAD

NOTES:

UNLESS OTHERWISE SPECIFIED:

1. ALL RESISTORS ARE IN OHMS, 1/4W, +/- 5% TOL.

2. ALL CAPACITORS ARE IN MICROFARADS.

3. C10 - C15 = .01 CHIP

4. L21 AND L22 = 8 TURNS CLOSE-WOUND, 3/16 INCH I.D.

C16A

10PF

C16B

6.5-30pF

C11

.01

A PRODUCTION RELEASE 02-20-07 DW DW DP

FM RF AMPLIFIER

201551F-SCH

A

1

DW

DW
DP

02-20-07

02-20-07
02-20-07

Schematic Diagram: FM RF Amplifier

Adjustments and Tests 6-20

Illustration 6-13 FM Low Pass Filter #2

6-21 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

EP

DWG. NO. REV.

1234 78

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E

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1 234 678

A

B

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E

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THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF
INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS
FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET

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E . C . N. REV DESCRIPTION

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PECHK CMDATE DWN

REVISION HISTORY

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B_L_SHT1_A.DOT REV.

A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

J1

RF IN

J2

BNC

C1A
10pF

C1

15.4pF

C3

40.9pF

C5

38.9pFC737.7pFC914.1pF

C10

2pF

C19

47pF

C12

47pF NPO

C13

0.001uF

C14

0.01uF
C15

.01

C16

0.001uF

C2

1.35pF

C4

7.1pFC69.3pFC85.13pF

C11

47pF NPO

L1

OPEN

L2

90.5nH

L3

94.1nH

L4

87.5nH

L5

77.9nH

D1 1N6263

D2

1N6263

12345

HD2
1X5

R6
1K

R9
1K

R7
20K

R8
20K

R4
10

R2

73.2

R3

10

R5

73.2

NOTES:
=======
UNLESS OTHERWISE SPECIFIED

1) ALL RESTORS ARE IN OHMS, 1/4W, 5%

2) ALL CAPACITORS ARE IN MICROFARADS

3) C1-C10 AND C17 ARE CIRCUIT BOARD PADS

FWD

REFL

C17

3.5pF

C18

47pF

C20
.01

R1
100

R11
100K

R10
10K

D3

1N6263

1
2
3

HD1

RF MONITOR

Aprox. 7V RMS
with 200w RF in

RFV

RF OUT

4) IF NECESSARY, SELECT R2 FOR SWR READING OF

1.1 OR BETTER WITH 50 OHM LOAD R5 = R2

SHIELD

J

REDRAWN

12-05-03

DW

DW

03-14-02

DP

C1-C10 AND C17
ARE PWB COPPER AREAS

FM LOW PASS FILTER #2

103209-SCH

J

Schematic Diagram: FM Low Pass Filter #2

Adjustments and Tests

6-22

Illustration 6-14 FM RF Driver

6-23 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

DWG. NO. REV.

1234 78

A

B

C

D

E

F

1 234 678

A

B

C

E

F

5

THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF
INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS
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DEVICES WITHOUT PERMISSION.

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65

SIZE

B

B_L_SHT1_A.DOT REV.

A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

L1
33uH

J1

RF IN

L2

OPEN

R10
10K

IN1GND2GND3N/C4VCC5N/C6GND7GND8OUT

9

XU1

MHW6342T

R1
OPEN

C6

0.01

C7

0.01

T1

Q1

BLF245

R2

OPEN

C15
680pF

L3

C10

10pF

C11

36pF

C12

36pF

C13

5pF

L4

10.4uH

L5

23.2uH

C14
27pF

J2

RF OUT

C9
OPEN

R11

4.7K

R9

51

C17

0.01

+24VDC

C16

0.01

C18

OPEN

1/2W

3
2

1

84

U2A

OPEN

5
6

7

U2B

OPEN

R15
OPEN

R14
OPEN

G

S

D

1

J3

1

J4

R13
OPEN

R12

OPEN

R8

*

D3
1N753A

6.2V

DW 08-28-03

533

1

J5

R7
OPEN

C8

OPEN

2

1

3

D1

OPEN

C1

.01

Vin

1

GND

2

Vout

3

VR1
OPEN

R16

OPEN

C2

OPEN

R4
OPEN

R3
OPEN

2

1

3

D2

OPEN

C3

.01

R6
OPEN

+5V

R5

OPEN

C4
OPEN

UNLESS OTHERWISE SPECIFIED:

NOTE:

1. ALL RESISTORS ARE IN OHMS, 1/4 WATT +/- 5% TOL.

2. ALL CAPACITORS ARE IN MICROFARADS.

L6

OPEN

R17
51

DW 10-30-03
DP 10-30-03

C19
OPEN

RT1

2.7K NTC

OPEN

T

L7

OPEN

C20

OPEN

C21

OPEN

C22

OPEN

R18

0

FM30 FM100 FM250 FM500

R8 POWER LEVEL CONFIGURATION

OPEN 3 OHM 5W 2.7 OHM 5W3 OHM 5W

FOR FM100 AND FM250: 18V
FOR FM500: 20V
FOR FM30: FEED POINT FROM PWR. REGULATOR PWB.

FOR FM30:
20VDC INPUT APPLIED HERE.

C5

22

C23

.01

C24

.01

ADDED TO PWB (200922-PWB-D IN LOCATION

SHOWN, AND DEPICTED ON COMPONENT MAP.

M PRODUCTION RELEASE 12-10-03

DW

DW DP264

N XU1 WAS 200479-TERM-10 01-29-04

DW

DW MH279

O PWB CHG'D TO REV. C 06-14-04

DW

DW DP316

P PWB CHG'D TO REV. D 03-22-05

DW

DW DP361

SCH, FM RF DRIVER

Q43310-4F

Q

Q PWA & PWB NOW RoHS. 07-28- 06

DW

DW DP475

Q43310-4F Q

Schematic Diagram: FM RF Driver

Adjustments and Tests 6-24

THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS
FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET

OF

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3456

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A A

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456

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SIZE

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A_L_SHT1_A.DOT REV. A

INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

B4

B3

B2

J1

BNC

C1

OPEN

1
2
3
4
5
6

J2

HEADER 6

GND
FAN
TEMP+
SENSE
V1+
V2+

C2
.01C3.01C4.01C5.01

PAD

PAD

PAD

PAD

PAD

RF

GND

PAD

PAD

PAD

PADPAD

PADPADPAD PAD

PADPADPAD

SCH, FM EUROAMP DC INPUT FEED THRU

DW 02-07-02

200419-SCH-2.SCH

A PRODUCTION RELEASE 02-19-02 DW160-A

200419-SCH

A

Illustration 6-15 FM Euroamp DC

Input Feedthru (Top Side)

Illustration 6-16 FM Euroamp DC

Input Feedthru (Bottom Side)

Schematic Diagram: FM Euroamp DC Input Feedthru

6-25 FM30/FM150/FM300 User’s Manual

FM30/150/300 User’s Manual

Board Layouts and Schematics

DWG. NO.

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APPROVALS

PECHK CMDATE DWN

REVISION HISTORY

THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS
THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.

SHEET

OF

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TITLE:

UNCONTROLLED

UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
CONTROLLED COPY, COPIES OF THESE DOCUMENTS
INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.

APPROVALS
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INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
574-262-8900

WWW.IREC1.COM

IREC

M1HD-S RF POWER AMP

1
2
3
4
5

PL1005

PL1001

BNC

TO

MOTHER BOARD

FAN

RF OUT

PA FAN

RF IN

RF DRIVER

VOLTAGE REGULATOR

xxx

HD503

20 C0ND. RIBBONCBL

1
2
3

HD703

x
x
x

HD702

20 C0ND. RIBBONCBL

1

2

3

4

5

6

HD701
HEADER 6

12345

6

HD502

xxx

HD4

6 C0ND. RIBBONCBL

1

P1

+UNREG

1

P805

1

P804

1

P808
PA DC OUT

1

P807
GND

123

PL1002

123

PL1004

xxx

HD1

6 C0ND. RIBBONCBL

RF IN

RF OUT

LP FILTER

RF OUT

RF IN

RF OUT

POWER REGULATOR

S1002

S1002

CARRIER

POWER

TO

MOTHER BOARD

TO

MOTHER BOARD

DRVR V+

12345678910

HD505

ON

MOTHER BOARD

TEMP SENSE

SCH, FM CHASSIS INTERCONNECT

533

DW 04-04-05

PRODUCTION RELEASEA 04-04-05 DW

120V
200V

6.3A

VOLTAGE FUSE SIZE

*

120/240 VAC

NOT USED

SEE CHART

50/60HZ

NEUTRAL

HOT

FILTER

*

A

B

C

D

E

F

G

H

t

NTC

t

NTC

T1001

1

P801

R1003
2K 3W

C1001

15,000UF/110V

+12V

-12V

1

J4

1

Z3-2

DRVR V+

CB1001

CIRCUIT BREAKER

1

P803

BATTERY IN

1

P802

ON

OFF

ON

OFF

220V
240V

3A

220

100

240

120

MOV

MOV

SLO-BLO FOR ALL APPLICATIONS

1

P806
GND

+

1

234

D1001

BRIDGE

DW 04-04-05
DP 06-24-04

DP

CORCOM 6EDL4CM

Schematic Diagram: FM Chassis Interconnect

Adjustments and Tests 6-26

Section 7—Service and Support

We understand that you may need various levels of support or that the
product could require servicing at some point in time. This section pro­vides information for both of these scenarios.

Service and Support 7-1

7.1 Service

The product warranty (see opposite page) outlines our responsibility for defective products.
Before returning a product for repair or replacement (our choice), call our Customer Service
department using the following telephone number:

[phone]

Our Customer Service Representative will give you further instructions regarding the return
of your product. Use the original shipping carton or a new one obtained from Crown. Place
shipping spacers between the slide-out power amplifier assembly and the back panel.
Please fill out the Factory Service Instructions sheet (page 7–5) and include it with your re­turned product.

7.2 24–Hour Support

In most instances, what you need to know about your product can be found in this manual.
There are times when you may need more in-depth information or even emergency-type in­formation. We provide 24–hour technical assistance on your product via a toll telephone
call. For emergency help or detailed technical assistance, call

[phone]

You may be required to leave a message at this number but your call will be returned
promptly from our on-call technician.

7.3 Spare Parts

To obtain spare parts, call Crown Broadcast Sales at the following number.

[phone]

You may also write to the following address:

International Radio and Electronics Corporation

P.O. Box 2000

Elkhart, Indiana, U.S.A. 46515-2000

FM30/FM150/FM300 User’s Manual 7-2

Crown Broadcast Three Year Limited Product Warranty

Summary Of Warranty

Crown Broadcast IREC warrants its broadcast products to the ORIGINAL PURCHASER of a NEW
Crown Broadcast product, for a period of three (3) years after shipment from Crown Broadcast. All
products are warranted to be free of defects in materials and workmanship and meet or exceed all
specifications published by Crown Broadcast. Product nameplate with serial number must be intact
and not altered in any way. This warranty is non - transferable. This warranty in its entirety is the only
warranty offered by Crown Broadcast. No other warranties, expressed or implied, will be enforceable.

Exclusions

Crown Broadcast will not warranty the product due to misuse, accident, neglect and improper instal­lation or operation. Proper installation included A/C line surge suppression, lightning protection and
proper grounding of the entire transmitter, and any other recommendations designated in the Instruc­tion manual. This warranty does not extend to any other products other than those designed and
manufactured by Crown Broadcast. This warranty does not cover any damage to any accessory such
as loads, transmission line or antennas resulting from the use or failure of a Crown Broadcast trans­mitter. Warranty does not cover any loss of revenue resulting from any failure of a Crown Broadcast
product, act of God, or natural disaster.

Procedure for Obtaining Warranty Service
Crown Broadcast will repair or service, at our discretion, any product failure as a result of normal in­tended use. Warranty repair can only be performed at our plant facility in Elkhart, Indiana USA or at a
factory authorized service depot. Expenses in remedying the defect will be borne by Crown Broad­cast, including two-way ground transportation cost within the continental United States. Prior to re­turning any product or component to Crown Broadcast for warranty work or repair, a Return Authori­zation (RA) number must be obtained from the Crown Broadcast Customer Service Department.
Product must be returned in the original factory pack or equivalent. Original factory pack materials
may be obtained at a nominal charge by contacting Crown Broadcast Customer Service. Resolution
of the defective product will be made within a reasonable time from the date of receipt of the defec­tive product.

Warranty Alterations
No person has the authority to enlarge, amend, or modify this warranty, in whole or in part. This war­ranty is not extended by the length of time for which the owner was deprived the use of the product.
Repairs and replacement parts that are provided under the terms of this warranty shall carry only the
unexpired portion of the warranty.

Product Design Changes
Crown Broadcast reserves the right to change the design and manufacture of any product at any
time without notice and without obligation to make corresponding changes in products previously
manufactured.

Legal Remedies of Purchaser
This written warranty is given in lieu of any oral or implied warranties not covered herein. Crown
Broadcast disclaims all implied warranties including any warranties of merchantability or fitness for a
particular purpose.

Crown Broadcast

25166 Leer Drive Elkhart, Indiana 46514-5425, Phone: [phone], Fax: [phone]

www.crownbroadcast.com

Service and Support 7-3

The following lists describe the spare parts kit available for your transmitter.

For the FM150 and FM300, use part number GFMSPARES.

The following parts are included:

Item Quantity

Fuse, 4A Slo-blo 5mmX20mm 6

Fuse, 6.3A Slo-blo 5mmX20mm 5

Fuse, 12.5A Slo-blo 5mmX20mm 5

15A 100V N-CH MOSFET 2
130V RMS 200V PEAK 6500A

ZENER

2

35A 400V Bridge Rectifier 1

Diode, BYV72E–150 20A 150V 2

MOS Gate Driver, 500V IR #IR2125 2

MOSFET, RF SD2942
Switching Regulator, 0.75A

1

LM3578AN 2
NTC, In-rush Current Limiter 2

EMI Filter, 6A 250V with Fuse 1
14 Stage Bin Cntr/OSC 74HC4060 1

These parts are included in the FM30 kit (part number GFM30SPARES):

Item Quantity

Fuse, 1.5A Slo-blo 5mmX20mm 6

Fuse, 3A Slo-blo 5mmX20mm 5

15A 100V N-CH MOSFET 2
130V RMS 200V PEAK 6500A

ZENER

2

35A 400V Bridge Rectifier 1

Diode, BYV72E–150 20A 150V 2

MOS Gate Driver, 500V IR #IR2125 2

BLF245 FET PWR Transistor 1
Switching Regulator, 0.75A

LM3578AN

2

NTC, In-rush Current Limiter 2

EMI Filter, 6A 250V with Fuse 1
14 Stage Bin Cntr/OSC 74HC4060 1

FM30/FM150/FM300 User’s Manual 7-4

Factory Service Instructions

To obtain factory service, complete the bottom half of this page, include it with the unit, and ship to:

International Radio and Electronics Corporation

25166 Leer Drive

Elkhart, Indiana, U.S.A. 46514-5425

For units in warranty (within 3 years of purchase from any authorized Crown Dealer): We pay for
ground UPS shipments from anywhere in the continental U.S. and Federal Express Second Day
service from Hawaii and Alaska to the factory and back to you. Expedited service/shipment is
available for an additional charge. You may forward your receipt for shipping charges which we will
reimburse. We do not cover any charges for shipping outside the U.S. or any of the expenses
involved in clearing customs.

If you have any questions about your Crown Broadcast product, please contact Crown Broadcast
Customer Service at:

Telephone: [phone] or [phone]

Fax: [phone]

Name: Company:

Shipping Address:

Phone Number: Fax:

Model: Serial Number: Purchase Date:

Nature of the Problem

(Describe the conditions that existed when the problem occurred and what attempts were made to correct it.)

Other equipment in your system:

If warranty has expired, payment will be: Cash/Check VISA Mastercard

Please Quote before servicing

Card Number: Exp. Date: Signature:

Return Shipment Preference if other than UPS Ground: Expedite Shipment Other

ENCLOSE WITH UNIT—DO NOT MAIL SEPARATELY

Service and Support 7-5

Appendix

Transmitter Output Efficiency

RF Power Output-FM 30

PADC Volts PADC Amps RF Power Efficiency

27.9 2.16 34 56

26.2 2.09 32 58

24.7 2.02 30 60

22.5 1.91 26 60

20.2 1.77 22 62

17.0 1.56 17 64

14.1 1.34 14 74

12.6 1.22 10 65

10.5 1.04 7 64

8.8 .88 5 65

6.6 .65 3 70

5.4 .53 2 70

Power measurements were made at 97.1 MHz. Voltage and current measurements were taken from
the unit’s built-in metering. The accuracy of the internal metering is better than 2%. Return loss of
the RF load was greater than –34 dB at test frequency .

FM30/FM150/FM300 User’s Manual A-1