CalAmp Wireless Networks 2424096-001 T-96SR 900MHz Transceiver/Modem User Manual Cover

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3492 Synthesized 900 MHz Transceiver
Service Manual
First Printing
June 1997
Part No. 001-3492-001
6-97mwp
-1
Printed in U.S.A.
April 1997
Part No. 001-3492-001
3492 SYNTHESIZED 900 MHZ TRANSCEIVER
SERVICE MANUAL
Copyright 1997 by the Johnson Data Telemetry Corporation.
The Johnson Data Telemetry Corporation designs and manufactures radios and radio modems to serve a wide variety of data
communication needs. The Johnson Data Telemetry Corporation produces equipment for the fixed data market including
SCADA systems for utilities, petrochemical, waste and fresh water management markets and RF boards for OEM applications
in the Radio Frequency Data Capture market. In addition, the Johnson Data Telemetry Corporation provides wireless communication solutions to the mobile data market serving public safety, utilities and industrial users.
DATA TELEMETRY PRODUCT WARRANTY
The manufacturer's warranty statement for this product is available from your product supplier or from the Johnson Data
Telemetry Corporation, 299 Johnson Avenue, PO Box 1733, Waseca, MN 56093-0833. Phone (507) 835-8819.
WARNING
This device complies with Part 15 of the FCC rules. Operation is subject to the condition that this device does not cause harmful interference. In addition, changes or modification to this equipment not expressly approved by the Johnson Data Telemetry Corporation could void the user's authority to operate this equipment (FCC rules, 47CFR Part 15.19).
DO NOT allow the antenna to come close to or touch, the eyes, face, or any exposed body parts while the radio is transmitting.
DO NOT operate the radio near electrical blasting caps or in an explosive atmosphere.
DO NOT operate the radio unless all the radio frequency connectors are secure and any open connectors are properly terminated.
DO NOT allow children to operate transmitter equipped radio equipment.
SAFETY INFORMATION
Proper operation of this radio will result in user exposure below the Occupational Safety and Health Act and Federal Communication Commission limits.
The information in this document is subject to change without notice.
™
Johnson Data Telemetry is a trademark of the Johnson Data Telemetry Corporation.
-3
April 1997
Part No. 001-3492-001
TABLE OF CONTENTS
GENERAL INFORMATION
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
SCOPE OF MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EQUIPMENT DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DL3492 WITH LOADER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DL3492 WITH MODEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DM3492 SYNTHESIZER PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRANSCEIVER IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PART NUMBER BREAKDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FACTORY CUSTOMER SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRODUCT WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FACTORY RETURNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION
2.1
2.2
PRE-INSTALLATION CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
INTERFACING WITH DATA EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
DM3492 (RF Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
PROGRAMMING
3.1
3.2
3.3
3.4
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
DM3492 SYNTHESIZER DATA PROTOCOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SYNTHESIZER DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
D-WORD CALCULATION (24 BITS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
C-WORD CALCULATION (24 BITS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
B-WORD CALCULATION (24 BITS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
A0-WORD CALCULATION (24 BITS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
TX / RX FREQUENCY SHIFT AND BAND SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
RADIO DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
RECEIVE TO TRANSMIT SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
TRANSMIT TO RECEIVE SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
CIRCUIT DESCRIPTION
4.1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
RECEIVER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
TRANSMITTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
VOLTAGE-CONTROLLED OSCILLATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
VCO AND REFERENCE OSCILLATOR MODULATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
CASCADE AMPLIFIERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
VOLTAGE FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
VCO FREQUENCY SHIFT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
SYNTHESIZER INTEGRATED CIRCUIT (U800) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
LOCK DETECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.2
1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-2
1-2
1-3
1-3
1-3
1-3
TABLE OF CONTENTS
4.3
4.4
4.5
RECEIVER CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
CERAMIC FILTER, RF AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
MIXER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
FIRST LO AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
CRYSTAL FILTER, FIRST IF SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
SECOND LO/MIXER/DETECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
TRANSMITTER CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
DRIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
FINAL, COMPARATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
ANTENNA SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
TRANSMIT KEY-UP CONTROL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
VOLTAGE REGULATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
+9.6 AND +5.5V REGULATED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
SERVICING
5.1
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
PERIODIC CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
SURFACE-MOUNTED COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
REPLACEMENT PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
TCXO MODULE NOT SERVICEABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
SYNTHESIZER SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
REFERENCE OSCILLATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
SYNTHESIZER (U800) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
RECEIVER SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
SUPPLY VOLTAGES AND CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
MIXER/DETECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
SECOND LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
AUDIO BUFFER AMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
CRYSTAL FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
MIXER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
LOW NOISE AMPLIFIER (LNA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
ANTENNA SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
TRANSMITTER SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
SUPPLY VOLTAGES AND CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
FINAL AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
ANTENNA SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
MODULATION INPUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
TCXO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.2
5.3
5.4
TABLE OF CONTENTS
ALIGNMENT PROCEDURE
6.1
6.2
6.3
6.4
6.5
6.7
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INITIAL SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCO CONTROL VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRANSMITTER AND FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODULATION ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRANSMITTER/FREQUENCY WITH LOADER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODULATION ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PARTS LIST
SCHEMATICS AND COMPONENT LAYOUTS
6.6
6-1
6-1
6-1
6-1
6-1
6-2
6-2
6-3
6-3
SECTION 1 GENERAL INFORMATION
1.1 SCOPE OF MANUAL
1.2.2 DL3492 WITH LOADER BOARD
This service manual contains alignment and service information for the JDT DM3492 900 MHz Synthesized Telemetry Unit.
The DL3492 (Part No. 242-3492-5x0) includes
the 8-channel Loader Board (Part No. 023-3240-001),
which performs synthesizer loading through an
RS-232 DB-9 interface. The Loader Board has circuitry which provides electronic control of the
following:
This manual concentrates on the RF section of
the data link which may be paired with an internal
Loader board or 9600 baud Modem board.
Transmit/Receive data conditioning and gating
Carrier Detect
Power Control
Preselector Tracking
1.2 EQUIPMENT DESCRIPTION
Modulation Flatness
1.2.1 GENERAL
Audio/Data Filtering
The JDT DM3492 is a synthesized data transceiver (transmitter and receiver) which operates in the
928-960 MHz UHF frequency range. Transmitter
power output is 1-5 watts, 5W at 13.3V nominal, and
operation is simplex or half duplex.
Sleep/Wake-up to minimize current consumption
Diagnostics that include:
Input Voltage Sense
Input Current Sense
Ambient Temperature Sense
RSSI Indicator (RSSI Sense)
Forward/Reverse Power Sense.
Service manuals addressing items specific to the
Loader board (001-3240-001) and the Modem board
(001-3276-001) should be referenced for the users
specific configuration.
In addition to this 900 MHz radio, JDT has a full
line of radios and radio modems to meet wireless data
communication needs. Both OEM RF decks and complete FCC type approved radios and radio modems are
available from 132-174 MHz at VHF, 380-512 MHz
at UHF and 928-960 MHz at 900 MHz in both 5W and
2W units (VHF and UHF). High Specification units
are available to meet International requirements and
bandwidths to meet U.S.A. refarming requirements.
To learn more about the other JDT products, call 1800-992-7774 or 1-612-890-8155 to speak to a sales
representative.
The gating circuits allow the type of data filtering
to be selected (standard or wide band) and also preemphasis/de-emphasis to be enabled or disabled.
This board is programmed using an IBM PC or
compatible computer and the Johnson Data Telemetry
programming software. Programming information is
stored by an EEPROM on the Loader board. Refer to
Section 3.3 for programming information.
1-1
June 1997
Part No. 001-3492-001
GENERAL INFORMATION
NOTE: The synthesizer must be loaded each time power is turned on. Therefore, one loader board or customer supplied programming circuit is required for
each data transceiver.
1.2.4 DM3492 SYNTHESIZER PROGRAMMING
The DM3492, when used without the Universal
Loader Board (Part No. 023-3240-001) requires customer supplied circuitry to load the synthesizer with
channel information. The protocol that this circuitry
must follow is described in Section 3.
1.2.3 DL3492 WITH MODEM
The DL3492 (Part No. 242-3492-5x0) includes
the 9600 baud Modem (Part No. 023-3276-001),
which supports the RNET™ communication protocol, allowing data communication between the
Johnson Data Telemetry high specification synthesized products and the Motorola RNET radio/
modems.
1.3 TRANSCEIVER IDENTIFICATION
The transceiver identification number is printed
on a label that is affixed to the PC board. The following information is contained in that number:
The Modem features include:
Model
3492
User Programmable Data Rates; 9600, 4800, 2400
and 1200 baud in a 25 kHz bandwidth.
RS-232 compatible.
Simplex or Half-Duplex operation.
RTS-CTS handshaking protocol with option for
configuring any two units as a digital repeater.
Ninth Digit
of PN
Revision
Letter
Manufacture
Date
Plant
Warranty
Number
14 3
12345
Week No.
of Year
Year
1.4 ACCESSORIES
Accessories available for the 3492 data transceiver are listed in Table 1-1.
Supports asynchronous, serial or transparent data
formats.
Table 1-1 ACCESSORIES
Front panel LEDs provide indication for Transmit,
Receive and Power.
Accessory
Part No.
3276 Service Manual
3240 Service Manual
Interface cable
Built-In Diagnostics reported both locally and
"Over-The-Air":
Reports specific unit programming
Loopback test feature
RSSI
Forward and Reflected Power
Temperature
Supply Voltage
001-3276-001
001-3240-001
023-3472-007
1.5 PART NUMBER BREAKDOWN
The following is a breakdown of the part number
used to identify this transceiver:
8-Channels programmable with option to switch
channels remotely "Over-The-Air".
242-3492 - 5 X 0
This board is programmed using an IBM PC or
compatible computer and the RSS programming software. The 3276 Modem Programming Kit (Part No.
023-3276-005) includes programming instructions
contained in the RSS Manual.
June 1997
Part No. 001-3492-001
1 = 12.5 kHz BW
3 = 25 kHz BW
5 = 928-960 MHz
1-2
GENERAL INFORMATION
1.6 FACTORY CUSTOMER SERVICE
1.7 PRODUCT WARRANTY
The Customer Service Department of the
Johnson Data Telemetry Corporation provides customer assistance on technical problems and the availability of local and factory repair facilities. Customer
Service hours are 7:30 a.m. - 4:30 p.m. Central Time,
Monday - Friday. There is also a 24-hour emergency
technical support telephone number. From within the
continental United States, the Customer Service
Department can be reached at this toll-free number
The warranty statement for this transceiver is
available from your product supplier or from the Warranty Department, Johnson Data Telemetry Corporation, 299 Johnson Avenue, PO Box 1733, Waseca,
MN 56093-0833. This information may also be
requested by phone from the Warranty Department.
The Warranty Department may also be contacted for
Warranty Service Reports, claim forms, or any questions concerning warranties or warranty service by
dialing (507) 835-6970.
1-800-992-7774
1.8 REPLACEMENT PARTS
When your call is answered at the Johnson Data
Telemetry Corporation, you will hear a brief message
informing you of numbers that can be entered to reach
various departments. This number may be entered
during or after the message using a tone-type telephone. If you have a pulse-type telephone, wait until
the message is finished and an operator will come on
the line to assist you. When you enter a first number
of "3", another number is requested to further categorize the type of information you need. You may also
enter the 4-digit extension number of the person that
you want to reach if you know what it is.
FAX Machine - Sales
FAX Machine - Cust Serv
Replacement parts can be ordered directly from
the Service Parts Department. To order parts by
phone, dial the toll-free number and then enter "3" as
described in Section 1.6. When ordering, please supply the part number and quantity of each part ordered.
Johnson Data Telemetry dealers also need to give their
account number.
If there is uncertainty about the part number,
include the designator (C112, for example) and the
model number of the equipment the part is from (refer
to Section 1.3).
(507) 835-6485
(507) 835-6969
You may also send your order by mail or FAX.
The mailing address is as follows and the FAX number is shown in Section 1.6.
If you are calling from outside the continental
United States, the Customer Service telephone numbers are as follows:
Johnson Data Telemetry Corporation
Service Parts Department
299 Johnson Avenue
PO Box 1733
Waseca, MN 56093-0833
Customer Service Department - (507) 835-6911
Customer Service FAX Machine - (507) 835-6969
You may also contact the Customer Service
Department by mail. Please include all information
that may be helpful in solving your problem. The
mailing address is as follows:
1.9 FACTORY RETURNS
Repair service is normally available through local
authorized Johnson Data Telemetry Land Mobile
Radio Service Centers. If local service is not available, the equipment can be returned to the factory for
repair. However, it is recommended that you contact
the Field Service Department before returning equipment. A service representative may be able to suggest
a solution to the problem so that return of the equipment would not be necessary. If using the toll-free
number in the preceding section, enter "3".
Johnson Data Telemetry Corporation
Customer Service Department
299 Johnson Avenue
P.O. Box 1733
Waseca, MN 56093-0833
1-3
June 1997
Part No. 001-3492-001
GENERAL INFORMATION
Be sure to fill out a Factory Repair Request Form
#271 for each unit to be repaired, whether it is in or
out of warranty. These forms are available free of
charge by calling the repair lab (see Section 1.6) or by
requesting them when you send a unit in for repair.
Clearly describe the difficulty experienced in the
space provided and also note any prior physical damage to the equipment. Include a form in the shipping
container with each unit. Your phone number and
contact name are very important because there are
times when the technicians have specific questions
that need to be answered in order to completely identify and repair a problem.
When returning equipment for repair, it is also a
good idea to use a PO number or some other reference
number on your paperwork in case you need to call
the repair lab about your unit. These numbers are referenced on the repair order to make it easier and faster
to locate your unit in the lab.
Return Authorization (RA) numbers are not necessary unless you have been given one by the Field
Service Department. They require RA numbers for
exchange units or if they want to be aware of a specific problem. If you have been given an RA number,
reference this number on the Factory Repair Request
Form sent with the unit. The repair lab will then contact the Field Service Department when the unit
arrives.
June 1997
Part No. 001-3492-001
1-4
GENERAL INFORMATION
3492 UHF SYNTHESIZED TELEMETRY UNIT SPECIFICATIONS
The following are general specifications intended for use in testing and servicing this transceiver. For current advertised specifications, refer to the specification sheet available from the Marketing Department. Specifications are
subject to change without notice.
GENERAL
Frequency Range
Frequency Control
Channel Spacing
Mode of Operation
Operating Voltage
Regulated Supply Voltages
Transmit Enable
Receive Current
Transceiver Enable
Power and Data Connector
RF Input/Output
Operating Temperature
Storage Temperature
Humidity
Maximum Dimensions
FCC Compliance
DM3492
RECEIVER
Bandwidth
Frequency Stability
Sensitivity - 12 dB SINAD
RF Input Impedance
Selectivity
Spurious and Image Rejection
Conducted Spurious Emissions
Intermodulation
FM Hum and Noise
Receive Attack Time
Total Receive On Time
Audio
Distortion
Response
Output Bias
Buffered Impedance
Buffered Audio Level
RSSI
928-960 MHz
Synthesized
12.5/25 kHz with 6.25 kHz Channel steps
Simplex or Half Duplex
+13.3V DC nominal (10-16V DC operational)
+5V DC ±5%
3-16V DC at 400 µA max
70 mA maximum
3-16V DC at less than 400 µA
14-pin in-line socket (Dupont 76308-14)
SMA Jack (female)
-30°C to +60°C (-22°F to +140°F)
-40°C to +85°C (-40°F to +185°F)
95% maximum RH at 40°C, non-condensing
4.585" L, 3.25" W, 2.2" H
Parts 90, 94, 15
Customer must apply
32 MHz
±1.5 PPM from -30°C to +60°C (-22°F to +140°F)
≤ 0.35 µ V, -116 dBm psophometrically weighted
50 ohms
65 dB 25 kHz, 60 dB 12.5 kHz
70 dB
< -57 dBm
70 dB
-40 dB, 25 kHz channels, -35 dB, 12.5 kHz channels
< 5 ms
7 ms maximum
< 3% psophometrically weighted
±1/-3 dB 0 to 2.5 kHz for 12.5 kHz Channel, 0 to 5 kHz for 25 kHz Channel
2.5V DC ±0.5V DC
>10k ohms
150 mV ±50 mV
0.7V to 2.0V DC output from -120 to -60 dBm
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June 1997
Part No. 001-3492-001
GENERAL INFORMATION
TRANSMITTER
Frequency Stability
Bandwidth
Maximum System Deviation
Frequency Spread
Modulation
Wideband Data Input Bias
Narrow Band Input
Input Impedance
Audio Distortion
Audio Response
Flatness
RF Power Output
Deviation Symmetry
RF Output Impedance
Duty Cycle
Transmitter Adjacent Power
Intermodulation Attenuation
Spurious and Harmonic FM
FM Hum and Noise
June 1997
Part No. 001-3492-001
±1.5 PPM from -30°C to +60°C (-22°F to +140°F)
32 MHz
5 kHz (25 kHz Channel), 2.5 kHz (12.5 kHz Channel)
32 MHz
FM/DC coupled
2.5V DC ±1%
AC coupled
>50k ohms
< 3% at 3 kHz deviation, 1 kHz tone
(with user interface board narrow band data port
±2 dB, DC to 5 kHz dev with a 1 kHz tone Programmable to ± dB using DAC
±1 dB across 32 MHz bandwidth
1-5W ±20% adjustable (5W at 13.3V DC nominal)
5%
50 ohms
50% (30 sec. max transmit)
-70 dB
-40 dB
-20 dBm max.
-40 dB 25 kHz, -35 dB 12.5 kHz
1-6
SECTION 2 INSTALLATION
2.1 PRE-INSTALLATION CHECKS
±3 dB that produces ±5 kHz deviation with a 1 kHz
tone. When this input is used, a temperature compensated 2.5V DC bias is required as variations in voltage
cause the frequency to change. The transceiver regulatory compliance must be applied for with the customer
supplied modulation limiting/filter circuit and chassis.
Field alignment should not be required before the
3492 is installed. However, it is still good practice to
check the performance to ensure that no damage
occurred during shipment. Performance tests are
located in Section 6.2.
Pin 7 (Synth Lock) - Output from synthesizer lock detect circuit. Low (< 1V DC) = unlocked, high (>2.5V
DC) = locked.
2.2 INTERFACING WITH DATA EQUIPMENT
2.2.1 DM3492 (RF Board)
Pin 8 (Synth En) - TTL input. Latch enable signal for
synthesizer. 250 ns min. for D, C and B words; 3 ms
min. for A0 word. A rising edge latches the data loaded
into the synthesizer IC..
Connector J201 on the data transceiver PC board
provides the interface with the data equipment. This is
a 14-pin female connector with .025" square pins on
0.1" centers (Dupont 76308-114). The cable (Part No.
023-3472-007) is not included with the data transceiver. An interface cable diagram and pin designations are shown in Figure 2-1.
Pin 9 (Data) - TTL input. Serial data line used for programming the synthesizer and diagnostic functions.
Pin 10 (Synth Clock) - TTL input. Clock signal for serial data input on Pin 9. Data is valid on the rising edge.
1 MHz max. frequency.
The following is a general description of the
input and output signals on Transceiver Interface connector J201.
Pin 11 (Diag En) - TTL input. Loads programmed
DAC values into DAC (U900) for modulation adjust
and power set. Also provides the strobe signal for shift
register (u901) for selecting Forward and Reverse power diagnostics. 250 ns min. activates on rising edge.
Pin 1 (Ground) - Chassis ground.
Pin 2 (+13.3V DC) - Input, transceiver main power.
Input range 10-16V DC with ±3 dB variation in output
power.
Pin 12 (RSSI) - Analog output (0.5-2V DC). The Receive Signal Strength Indicator output provides a voltage that increases in proportion to the strength of the
RF input signal.
Pin 3 (Tx En) - Input +3-16V DC. Enables transmit
circuitry. ≤ 0.3V DC in Rx mode.
Pin 4 (Rx En) - Input +3-16V DC. Enables receive circuitry. ≤ 0.3 V DC in Tx mode.
Pin 5 (RF En) - Input +3-16V DC. Shuts down onboard regulators. To be used as a power save mode.
Pin 13 (Demod) - Analog output. The Receiver Demod output level is 150 mV RMS with a modulation
signal of 1 kHz at 60% of maximum deviation. The output is DC coupled and referenced to +2.5V DC. Load
impedance should be >10k ohms.
Pin 6 (Mod In) - Provides a response of ±2 dB from
DC to 5 kHz across the RF band (referenced to
1 kHz). It is programmable to 1 dB with the diagnostic
DAC. The modulation capability is 250 mV RMS
Pin 14 (Diag) - Analog Output. This pin is enabled by
pin 11. When the Loader board is used it has the capability to test the operating environment through diagnostics. The diagnostic capabilities are in Section 1.2.2
2-1
June 1997
Part No. 001-3492-001
INSTALLATION
10
11
13
12
GROUND
14
+13.3V DC
TX EN
RX EN
RF EN
MOD IN
SYNTH LOCK
SYNTH EN
DATA
SYNTH CLOCK (1.3 MHz)
DIAG EN
RSSI
DEMOD
DIAG
PART NO. 023-3472-007
Figure 2-1 DM3492 INTERFACE CABLE
June 1997
Part No. 001-3492-001
2-2
SECTION 3 PROGRAMMING
A diagram of the 32 Bit Synthesizer Serial Data
Stream with definitions of the bits is shown in Figure
3-1.
3.1 INTRODUCTION
DM3492 - The information in Section 3.2
describes synthesizer programming protocol. This
information can be used as a basis for designing the
synthesizer programming hardware and software
required.
Clock
Synth Enable
D00-D23
1 MHz (max)
250 ns (min) (for D, C and B words
approximately 3 ms for A0 word)
D, C, B and A0 words
3.2.2 SYNTHESIZER DATA
3.2 DM3492 SYNTHESIZER DATA PROTOCOL
In order to implement the band selection and
Tx/Rx frequency shift mentioned in Section 3.2.1, an
additional shift register was added to the synthesizer
section. Therefore, an additional 8 Bits of data are
added to each of the synthesizer load words (D/C/B/
A0) as shown in the serial data stream in Figure 3-1.
3.2.1 GENERAL
The 928-960 MHz band is divided into two segments for the purpose of reducing VCO gain. The
"LOW" band covers the 928-944 MHz segment and
the "HIGH" band covers the 944-960 MHz segment.
The VCO band selection is accomplished by capacitive pin-switching. The band switching is implemented in both the transmit and receive modes. The
front-end filters and transmitter line-up cover the
entire 928-960 MHz band without adjustment.
3.2.3 D-WORD CALCULATION (24 BITS)
The D-Word programs the Main, Reference and
Auxiliary dividers, and sets the modulus (refer to
Figures 3-2 and 3-6).
Receive Bandwidth
928-960 MHz
Transmit Bandwidth
928-960 MHz
First IF
87.850 MHz
Second IF
450.0 kHz
First LO Injection
840.150-872.150 MHz*
Second LO Injection
87.40 MHz*
TCXO Frequency
17.50 MHz
Resolution
6.25 kHz
Loop Comparison Freq. 50 kHz
NR = 350
* Low Side Injection
D Word = 0xA1 0x5E 0x26
D23
D22
D21
D20
Ftcxo/50 kHz=350
where Ftcxo=17.5 MHz
SM = 00
Reference select for main phase detector
EM = 1
Main divider enable flag
SA = 00
Reference select for aux phase detector
EA = 1
Auxiliary divider enable flag
FMOD = 1 Selects modulus 8
LONG = 0 Send all 4 words with A0
D1
D0
XX
XX
XX
XX
Low+
Low-
Tx+
Tx-
Data
MSB (31)
LSB (00)
Clock
Synth En
Figure 3-1 32-BIT SYNTHESIZER SERIAL DATA STREAM
3-1
June 1997
Part No. 001-3492-001
PROGRAMMING
3.2.4 C-WORD CALCULATION (24 BITS)
3.2.6 A0-WORD CALCULATION (24 BITS)
The C-Word enables the auxiliary prescaler, and
sets the auxiliary divide ratio for the secondary (Second LO) loop (refer to Figures 3-4 and 3-7).
The A0-Word is sent last (see Figure 3-5). The
A0-Word contains the data for the loop dividers and is
programmed on a channel-by-channel basis. The
Functional-N (NF) word is a 3 bit word that programs
the synthesizer to the fractional steps determined by
the fractional modulus selection flag (1 = modulus 8)
and the loop comparison frequency (50 kHz). The frequency resolution (i.e. step size) is then 50 kHz ÷ 8 =
6.25 kHz.
PA = 0
Sets aux prescaler mode to ÷ 4
NA = 437 (0x1B5) Auxiliary divide ratio
87.4 MHz ÷ (4 x 437) = 50 kHz
C-Word = 0x91 0xB5 0x00
3.2.5 B-WORD CALCULATION (24 BITS)
NF=* Fractional increment for modulus 8 (3 bits)
NM1=* Number of main divider cycles when
prescaler modulus equals 64 (12 bits)
NM2=* Number of main divider cycles when
prescaler modulus equals 65 (4 bits, PR=10)
NM3=* Number of main divider cycles when
prescaler modulus equals 72 (4 bits, PR=10)
The B-Word programs the Fractional-N charge
pump current setting factor. The Binary acceleration
factors (CL/CK) and prescaler type (modulus 3).
The value of CN should be interpolated for frequencies between the band edges. With these recommended values of CN, the transceiver should have the
fractional spurs minimized far below the levels needed
to make 70 dB adjacent channel Rx or Tx specifications.
* Indicates frequency/channel dependant variable.
EXAMPLE: To program an 18.75 kHz channel:
NF = 18.75 kHz ÷ 6.25 kHz
NF = 3
The Charge Pump Current setting (CN) could be
changed on a channel-by-channel basis for ultimate
rejection of the Fraction N spurious responses close
into the carrier frequency. the 3492 synthesizer has an
adjust (R823) for the fractional compensation current. The factory preset value will allow CN to be set
to the following ranges:
NM1, NM2 and NM3 are calculated as follows:
N = (NM1 + 2) x 64 + NM2 x 65 + (NM3 +1) x 72
Where:
N=
Total division ratio
NM1 = Number of main divider cycles when
prescaler modulus equals 64
NM2 = Number of main divider cycles when
prescaler modulus equals 65
NM3 = Number of main divider cycles when
prescaler modulus equals 72
(Refer to Figures 3-3 and 3-7)
Frequency in a Band
Lowest Tx
Highest Tx
Lowest Rx
Highest Rx
CN
110
115
100
105
Example:
CN = *
(Channel/Frequency dependent variable)
(110-115 Tx) (100-105 Rx)
CK = 0000 Binary acceleration factor for integral
charge pump
CL = 00
Binary acceleration factor for
proportional charge pump
PR = 10
Selects modulus 3 prescaler
Calculate NM1, NM2 and NM3 to Rx 944.150 MHz
Rx LO = 944.15 - 87.85 = 856.3 MHz (Synth Freq)
(87.85 MHz IF with Low Side Injection)
N = Rx LO ÷ FCM = 856.3 ÷ 0.05 = 17126
(FCM = Loop Reference Frequency)
B-Word = 0x80 (8 bit CN) 0x02
June 1997
Part No. 001-3492-001
3-2
PROGRAMMING
NM3 = (INT(64 x FRAC [N ÷ 64]) ÷ 8) - 1
= (INT(64 x 0.59375) ÷ 8) - 1
= (INT(38 ÷ 8)) - 1
=4-1
=3
3.2.7 TX / RX FREQUENCY SHIFT AND BAND
SELECTION
As mentioned in 3.2.2, in order to implement the
band selection and Rx/Rx an additional 8 bits of data
are added to each of the synthesizer load words (D/C/
B/AO) (see Figure 3-1). The frequency bands and
Transmit/Receive Bits are defined as follows:
NM2 = 8 x FRAC [N ÷ 8]
= 8 x 0.75
=6
Low Band
High Band
NM1 = INTEGER [N ÷ 64] - NM2 - NM3 - 3
= 267 - 6 - 3 - 3
= 255
xx
Low+
LowTx+
Tx-
928-944 MHz
>944 MHz to 960 MHz
Don’t care
Low Band Select (1=lowband, 0=highband)
Low Band Select (0=lowband, 1=highband)
Transmit Select (1=Tx mode, 0=Rx mode)
Transmit Select (0=Tx mode, 1=Rx mode)
BITS 1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0/1
ADDRESS
NR (REFERENCE DIVIDE)
= 350 FOR 50 kHz REFERENCE
SM (ALWAYS 00)
EM (ALWAYS 1)
SA (ALWAYS 00)
EA (ALWAYS 1)
FMOD (1 = MODULUS 8)
LONG (0=24 BIT WORD)
Figure 3-2 D-WORD
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Part No. 001-3492-001
PROGRAMMING
BITS 1
ADDRESS
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
NA (AUXILIARY DIVIDE RATIO)
= 437 FOR 50 kHz REFERENCE
(ALWAYS 0)
PA (ALWAYS 0)
Figure 3-3 C-WORD
BITS 1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
ADDRESS
NOT USED
(ALWAYS 0000)
CL
CK
BINARY ACCELERATION
CN
(CHARGE PUMP CURRENT SETTING)
(CHANNEL DEPENDENT)
FACTOR (ALWAYS 000000)
PR (PRESCALER TYPE) (10=MODULUS 3)
Figure 3-4 B-WORD
BITS 1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
ADDRESS
NF
NM1
(NUMBER OF MAIN DIVIDER CYCLES
WHEN PRESCALER MODULUS = 64)
NM2
(NUMBER OF MAIN DIVIDER CYCLES
WHEN PRESCALER MODULUS = 65)
Figure 3-5 A0-WORD
June 1997
Part No. 001-3492-001
3-4
PROGRAMMING
A0
24
NF
NM1
NM3
1 0
0 0
1 0
0 1
1 0
1 0
1 1
1 1
0 0
CN
CK
NA
CL
PA
NR
NM2
PR
SM EM SA EA
0 0 T1 T0
PR="10"
F L
M O
O N
D G
24
ADDRESS BITS
TEST BITS
NOTE: E-Word not used in Synthesizer load.
Figure 3-6 SERIAL INPUT WORD FORMAT
XX
XX
XX
XX
XX
A1
A0
Rng
D7
D6
D5
D4
D3
D2
D1
D0
XX
XX
XX
XX
XX
XX
XX
a0
Data
MSB (23)
LSB (00)
Clock
Diag En
Figure 3-7 DIAGNOSTIC SERIAL DATA STREAM
3-5
June 1997
Part No. 001-3492-001
PROGRAMMING
3.2.8 RADIO DIAGNOSTICS
3. The SYNTH ENABLE line should be held HIGH
for 2 to 3 milliseconds after the last word is sent.
This puts the frequency synthesizer in a SPEEDUP
MODE and slightly improves lock times then the
Synth Enable should be returned to a low state.
The diagnostic features allow the user to program
a Digital-To-Analog Converter (DAC) to adjust RF
output power and modulation flatness without removing the radio from the enclosure. Bit "a0" can be set
to provide an analog voltage representative of the forward and reverse RF power at the radio interface connector J201, pin 14. This feature can be used to monitor the condition of the transceiver and antenna/
feedline. Figure 3-7 is a diagram of the Diagnostic
Serial Data Stream with definitions of the bits. It is 19
bits long, the front (MSBs) can be padded with "Don’t
Cares" (XXs) to get to 24 bits.
4. After the last word is strobed in, 7 milliseconds
(worst case) should elapse before TX_EN is turned
ON. This allows the synthesizer to come within
1 kHz of the desired frequency.
RX_EN
DATA
D0
D24
"D" WORD
Clock
Diag Enable
XX
D0
"C" WORD
D24
"B" WORD
D0
D24
"A" WORD
CLOCK
1 MHz (max)
250 ns (min)
Don’t Care
SYNTH_EN
9V TX
DAC Bits
SPEEDUP
RAMP-UP
LOCK
A1-A0 = DAC Output Select
00=Power Set
Data=0x00 to 0xFF, RNG=1
01=Mod Adj
Data=0x00 to 0xFF, RNG=1
11=DAC Control Select Data=0x00 to 0xFF, RNG=1
TX_EN
t=0
Figure 3-8 RX TO TX TIMING DIAGRAM
RNG = Range Select (max output) (Ref=5.5V÷2)
0 = 1 x Ref
1 = 2 x Ref
"Ramp-Up" is the amount of time required for
the transmitter to reach full power once the TX EN
has been applied. The Ramp-Up circuitry (located on
the transceiver) minimizes adjacent channel interference caused by spectral spreading (sinx/x) when the
transmitter is keyed. The Ramp-Up time is approximately 3 ms.
D7-D0 = D/A Data
0x00 = 0.0V
0xFF = 1 x Ref (RNG=0)
0xFF = 2 x Ref (RNG=1)
Shift Register Bits:
a0 = Diagnostic Select to J201, pin 14 (Analog Voltage)
0 = Forward Power
1 = Reverse Power
3.4 TRANSMIT TO RECEIVE SEQUENCE
3.3 RECEIVE TO TRANSMIT SEQUENCE
2. The synthesizer load process could begin slightly
before, but when the last bit is strobed in the synthesizer it will become unlocked.
1. TX_EN is turned OFF. This signal is shaped.
Refer to Figure 3-9.
1. Synthesizer is loaded (D, C, B and A0 words).
Refer to Figure 3-8.
3. The RX_EN line should switch from low to high
AFTER the TX_EN is switched. The RX_EN not
only turns the RX circuits on but also Pin Shifts the
VCO.
2. The state of the RX_EN line does not have to be
changed until the last bit is sent. However, Recieve
will cease as soon as it is changed.
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PROGRAMMING
4. For quickest lock times the SYNTH ENABLE line
on the last load word should be held high for 2 to 3
milliseconds. It MUST NOT be left high as the synthesizer in the SPEEDUP mode has poor noise performance and would degrade the Receive
performance.
RX_EN
DATA
D0
D24
"D" WORD
D0
"C" WORD
D24
"B" WORD
D0
D24
"A" WORD
CLOCK
SYNTH_EN
9V TX
t=0
RAMP-DOWN
SPEEDUP
TX_EN
Figure 3-9 TX TO RX TIMING DIAGRAM
Speedup is 2 to 3 ms
Lock is approximately 7 ms
Ramp is approximately 3 ms
Dekey is approximately 3 ms
"Ramp-Down" is the amount of time required for
the transmitter output power to be reduced before
switching off the transmitter and enabling the receiver
with the RX EN. The Ramp-Down circuitry (located
on the transceiver) minimizes adjacent channel interference caused by spectral spreading (sinx/x) when the
transmitter un un-keyed. The Ramp-Down time is
approximately 3 ms.
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SECTION 3 PROGRAMMING
A diagram of the 32 Bit Synthesizer Serial Data
Stream with definitions of the bits is shown in Figure
3-1.
3.1 INTRODUCTION
DM3492 - The information in Section 3.2
describes synthesizer programming protocol. This
information can be used as a basis for designing the
synthesizer programming hardware and software
required.
Clock
Synth Enable
D00-D23
1 MHz (max)
250 ns (min) (for D, C and B words
approximately 3 ms for A0 word)
D, C, B and A0 words
3.2.2 SYNTHESIZER DATA
3.2 DM3492 SYNTHESIZER DATA PROTOCOL
In order to implement the band selection and
Tx/Rx frequency shift mentioned in Section 3.2.1, an
additional shift register was added to the synthesizer
section. Therefore, an additional 8 Bits of data are
added to each of the synthesizer load words (D/C/B/
A0) as shown in the serial data stream in Figure 3-1.
3.2.1 GENERAL
The 928-960 MHz band is divided into two segments for the purpose of reducing VCO gain. The
"LOW" band covers the 928-944 MHz segment and
the "HIGH" band covers the 944-960 MHz segment.
The VCO band selection is accomplished by capacitive pin-switching. The band switching is implemented in both the transmit and receive modes. The
front-end filters and transmitter line-up cover the
entire 928-960 MHz band without adjustment.
3.2.3 D-WORD CALCULATION (24 BITS)
The D-Word programs the Main, Reference and
Auxiliary dividers, and sets the modulus (refer to
Figures 3-2 and 3-6).
Receive Bandwidth
928-960 MHz
Transmit Bandwidth
928-960 MHz
First IF
87.850 MHz
Second IF
450.0 kHz
First LO Injection
840.150-872.150 MHz*
Second LO Injection
87.40 MHz*
TCXO Frequency
17.50 MHz
Resolution
6.25 kHz
Loop Comparison Freq. 50 kHz
NR = 350
* Low Side Injection
D Word = 0xA1 0x5E 0x26
D23
D22
D21
D20
Ftcxo/50 kHz=350
where Ftcxo=17.5 MHz
SM = 00
Reference select for main phase detector
EM = 1
Main divider enable flag
SA = 00
Reference select for aux phase detector
EA = 1
Auxiliary divider enable flag
FMOD = 1 Selects modulus 8
LONG = 0 Send all 4 words with A0
D1
D0
XX
XX
XX
XX
Low+
Low-
Tx+
Tx-
Data
MSB (31)
LSB (00)
Clock
Synth En
Figure 3-1 32-BIT SYNTHESIZER SERIAL DATA STREAM
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PROGRAMMING
3.2.4 C-WORD CALCULATION (24 BITS)
3.2.6 A0-WORD CALCULATION (24 BITS)
The C-Word enables the auxiliary prescaler, and
sets the auxiliary divide ratio for the secondary (Second LO) loop (refer to Figures 3-4 and 3-7).
The A0-Word is sent last (see Figure 3-5). The
A0-Word contains the data for the loop dividers and is
programmed on a channel-by-channel basis. The
Functional-N (NF) word is a 3 bit word that programs
the synthesizer to the fractional steps determined by
the fractional modulus selection flag (1 = modulus 8)
and the loop comparison frequency (50 kHz). The frequency resolution (i.e. step size) is then 50 kHz ÷ 8 =
6.25 kHz.
PA = 0
Sets aux prescaler mode to ÷ 4
NA = 437 (0x1B5) Auxiliary divide ratio
87.4 MHz ÷ (4 x 437) = 50 kHz
C-Word = 0x91 0xB5 0x00
3.2.5 B-WORD CALCULATION (24 BITS)
NF=* Fractional increment for modulus 8 (3 bits)
NM1=* Number of main divider cycles when
prescaler modulus equals 64 (12 bits)
NM2=* Number of main divider cycles when
prescaler modulus equals 65 (4 bits, PR=10)
NM3=* Number of main divider cycles when
prescaler modulus equals 72 (4 bits, PR=10)
The B-Word programs the Fractional-N charge
pump current setting factor. The Binary acceleration
factors (CL/CK) and prescaler type (modulus 3).
The value of CN should be interpolated for frequencies between the band edges. With these recommended values of CN, the transceiver should have the
fractional spurs minimized far below the levels needed
to make 70 dB adjacent channel Rx or Tx specifications.
* Indicates frequency/channel dependant variable.
EXAMPLE: To program an 18.75 kHz channel:
NF = 18.75 kHz ÷ 6.25 kHz
NF = 3
The Charge Pump Current setting (CN) could be
changed on a channel-by-channel basis for ultimate
rejection of the Fraction N spurious responses close
into the carrier frequency. the 3492 synthesizer has an
adjust (R823) for the fractional compensation current. The factory preset value will allow CN to be set
to the following ranges:
NM1, NM2 and NM3 are calculated as follows:
N = (NM1 + 2) x 64 + NM2 x 65 + (NM3 +1) x 72
Where:
N=
Total division ratio
NM1 = Number of main divider cycles when
prescaler modulus equals 64
NM2 = Number of main divider cycles when
prescaler modulus equals 65
NM3 = Number of main divider cycles when
prescaler modulus equals 72
(Refer to Figures 3-3 and 3-7)
Frequency in a Band
Lowest Tx
Highest Tx
Lowest Rx
Highest Rx
CN
110
115
100
105
Example:
CN = *
(Channel/Frequency dependent variable)
(110-115 Tx) (100-105 Rx)
CK = 0000 Binary acceleration factor for integral
charge pump
CL = 00
Binary acceleration factor for
proportional charge pump
PR = 10
Selects modulus 3 prescaler
Calculate NM1, NM2 and NM3 to Rx 944.150 MHz
Rx LO = 944.15 - 87.85 = 856.3 MHz (Synth Freq)
(87.85 MHz IF with Low Side Injection)
N = Rx LO ÷ FCM = 856.3 ÷ 0.05 = 17126
(FCM = Loop Reference Frequency)
B-Word = 0x80 (8 bit CN) 0x02
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PROGRAMMING
NM3 = (INT(64 x FRAC [N ÷ 64]) ÷ 8) - 1
= (INT(64 x 0.59375) ÷ 8) - 1
= (INT(38 ÷ 8)) - 1
=4-1
=3
3.2.7 TX / RX FREQUENCY SHIFT AND BAND
SELECTION
As mentioned in 3.2.2, in order to implement the
band selection and Rx/Rx an additional 8 bits of data
are added to each of the synthesizer load words (D/C/
B/AO) (see Figure 3-1). The frequency bands and
Transmit/Receive Bits are defined as follows:
NM2 = 8 x FRAC [N ÷ 8]
= 8 x 0.75
=6
Low Band
High Band
NM1 = INTEGER [N ÷ 64] - NM2 - NM3 - 3
= 267 - 6 - 3 - 3
= 255
xx
Low+
LowTx+
Tx-
928-944 MHz
>944 MHz to 960 MHz
Don’t care
Low Band Select (1=lowband, 0=highband)
Low Band Select (0=lowband, 1=highband)
Transmit Select (1=Tx mode, 0=Rx mode)
Transmit Select (0=Tx mode, 1=Rx mode)
BITS 1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0/1
ADDRESS
NR (REFERENCE DIVIDE)
= 350 FOR 50 kHz REFERENCE
SM (ALWAYS 00)
EM (ALWAYS 1)
SA (ALWAYS 00)
EA (ALWAYS 1)
FMOD (1 = MODULUS 8)
LONG (0=24 BIT WORD)
Figure 3-2 D-WORD
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PROGRAMMING
BITS 1
ADDRESS
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
NA (AUXILIARY DIVIDE RATIO)
= 437 FOR 50 kHz REFERENCE
(ALWAYS 0)
PA (ALWAYS 0)
Figure 3-3 C-WORD
BITS 1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
ADDRESS
NOT USED
(ALWAYS 0000)
CL
CK
BINARY ACCELERATION
CN
(CHARGE PUMP CURRENT SETTING)
(CHANNEL DEPENDENT)
FACTOR (ALWAYS 000000)
PR (PRESCALER TYPE) (10=MODULUS 3)
Figure 3-4 B-WORD
BITS 1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
ADDRESS
NF
NM1
(NUMBER OF MAIN DIVIDER CYCLES
WHEN PRESCALER MODULUS = 64)
NM2
(NUMBER OF MAIN DIVIDER CYCLES
WHEN PRESCALER MODULUS = 65)
Figure 3-5 A0-WORD
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PROGRAMMING
A0
24
NF
NM1
NM3
1 0
0 0
1 0
0 1
1 0
1 0
1 1
1 1
0 0
CN
CK
NA
CL
PA
NR
NM2
PR
SM EM SA EA
0 0 T1 T0
PR="10"
F L
M O
O N
D G
24
ADDRESS BITS
TEST BITS
NOTE: E-Word not used in Synthesizer load.
Figure 3-6 SERIAL INPUT WORD FORMAT
XX
XX
XX
XX
XX
A1
A0
Rng
D7
D6
D5
D4
D3
D2
D1
D0
XX
XX
XX
XX
XX
XX
XX
a0
Data
MSB (23)
LSB (00)
Clock
Diag En
Figure 3-7 DIAGNOSTIC SERIAL DATA STREAM
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PROGRAMMING
3.2.8 RADIO DIAGNOSTICS
3. The SYNTH ENABLE line should be held HIGH
for 2 to 3 milliseconds after the last word is sent.
This puts the frequency synthesizer in a SPEEDUP
MODE and slightly improves lock times then the
Synth Enable should be returned to a low state.
The diagnostic features allow the user to program
a Digital-To-Analog Converter (DAC) to adjust RF
output power and modulation flatness without removing the radio from the enclosure. Bit "a0" can be set
to provide an analog voltage representative of the forward and reverse RF power at the radio interface connector J201, pin 14. This feature can be used to monitor the condition of the transceiver and antenna/
feedline. Figure 3-7 is a diagram of the Diagnostic
Serial Data Stream with definitions of the bits. It is 19
bits long, the front (MSBs) can be padded with "Don’t
Cares" (XXs) to get to 24 bits.
4. After the last word is strobed in, 7 milliseconds
(worst case) should elapse before TX_EN is turned
ON. This allows the synthesizer to come within
1 kHz of the desired frequency.
RX_EN
DATA
D0
D24
"D" WORD
Clock
Diag Enable
XX
D0
"C" WORD
D24
"B" WORD
D0
D24
"A" WORD
CLOCK
1 MHz (max)
250 ns (min)
Don’t Care
SYNTH_EN
9V TX
DAC Bits
SPEEDUP
RAMP-UP
LOCK
A1-A0 = DAC Output Select
00=Power Set
Data=0x00 to 0xFF, RNG=1
01=Mod Adj
Data=0x00 to 0xFF, RNG=1
11=DAC Control Select Data=0x00 to 0xFF, RNG=1
TX_EN
t=0
Figure 3-8 RX TO TX TIMING DIAGRAM
RNG = Range Select (max output) (Ref=5.5V÷2)
0 = 1 x Ref
1 = 2 x Ref
"Ramp-Up" is the amount of time required for
the transmitter to reach full power once the TX EN
has been applied. The Ramp-Up circuitry (located on
the transceiver) minimizes adjacent channel interference caused by spectral spreading (sinx/x) when the
transmitter is keyed. The Ramp-Up time is approximately 3 ms.
D7-D0 = D/A Data
0x00 = 0.0V
0xFF = 1 x Ref (RNG=0)
0xFF = 2 x Ref (RNG=1)
Shift Register Bits:
a0 = Diagnostic Select to J201, pin 14 (Analog Voltage)
0 = Forward Power
1 = Reverse Power
3.4 TRANSMIT TO RECEIVE SEQUENCE
3.3 RECEIVE TO TRANSMIT SEQUENCE
2. The synthesizer load process could begin slightly
before, but when the last bit is strobed in the synthesizer it will become unlocked.
1. TX_EN is turned OFF. This signal is shaped.
Refer to Figure 3-9.
1. Synthesizer is loaded (D, C, B and A0 words).
Refer to Figure 3-8.
3. The RX_EN line should switch from low to high
AFTER the TX_EN is switched. The RX_EN not
only turns the RX circuits on but also Pin Shifts the
VCO.
2. The state of the RX_EN line does not have to be
changed until the last bit is sent. However, Recieve
will cease as soon as it is changed.
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PROGRAMMING
4. For quickest lock times the SYNTH ENABLE line
on the last load word should be held high for 2 to 3
milliseconds. It MUST NOT be left high as the synthesizer in the SPEEDUP mode has poor noise performance and would degrade the Receive
performance.
RX_EN
DATA
D0
D24
"D" WORD
D0
"C" WORD
D24
"B" WORD
D0
D24
"A" WORD
CLOCK
SYNTH_EN
9V TX
t=0
RAMP-DOWN
SPEEDUP
TX_EN
Figure 3-9 TX TO RX TIMING DIAGRAM
Speedup is 2 to 3 ms
Lock is approximately 7 ms
Ramp is approximately 3 ms
Dekey is approximately 3 ms
"Ramp-Down" is the amount of time required for
the transmitter output power to be reduced before
switching off the transmitter and enabling the receiver
with the RX EN. The Ramp-Down circuitry (located
on the transceiver) minimizes adjacent channel interference caused by spectral spreading (sinx/x) when the
transmitter un un-keyed. The Ramp-Down time is
approximately 3 ms.
3-7
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SECTION 4 CIRCUIT DESCRIPTION
4.1 GENERAL
4.1.3 RECEIVER
4.1.1 INTRODUCTION
The receiver is a double-conversion type with
intermediate frequencies of 87.85 MHz / 450 kHz.
Bandpass filters reject the image, half IF, injection,
and other unwanted frequencies. A four-pole crystal
filter enhances receiver selectivity.
The main subassemblies of this transceiver are
the RF board, VCO board, TCXO, Loader board or
Modem. A block diagram of the transceiver is located
in Figure 4-1. The 3492 is also available in Transmit
only and Receive only models.
4.1.4 TRANSMITTER
The 3492 has a reference oscillator stability of
±1.5 PPM. The 17.5 MHz TCXO (Temperature Compensated Crystal Oscillator) is soldered directly to the
RF board. The TCXO is not serviceable.
The transmitter produces a nominal RF power
output of 5W at 13.3V DC, adjustable down to 1W.
Frequency modulation of the transmit signal occurs in
the synthesizer. Transmit audio processing circuitry is
contained in the Loader board, modem or customersupplied equipment.
4.1.2 SYNTHESIZER
The VCO (voltage-controlled oscillator) output
signal is the receiver first injection frequency in the
Receive mode and the transmit frequency in the
Transmit mode. The first injection frequency is
87.85 MHz below the receive frequency. The frequency of this oscillator is controlled by a DC voltage
produced by the phase detector in synthesizer chip
U800.
4.2 SYNTHESIZER
Programming of the synthesizer provides the data
necessary for the internal prescaler and counters. One
input signal is the reference frequency. This frequency
is produced by the 17.5 MHz reference oscillator
(TCXO). The other input signal is the VCO
frequency.
Channels are selected by programming counters
in U800 to divide by a certain number. This programming is performed over a serial bus formed by the
Synth Clock, Synth Enable, and Data pins of J201.
This programming is performed by the Loader board,
modem or user supplied hardware and software (see
Section 3).
A block diagram of the synthesizer is shown in
Figure 4-1 and a block diagram of Synthesizer IC
U800 is shown in Figure 4-2. As stated previously,
the synthesizer output signal is produced by a VCO
(voltage controlled oscillator). The VCO frequency is
controlled by a DC voltage produced by the phase
detector in U800. The phase detector senses the phase
and frequency of the two input signals and causes the
VCO control voltage to increase or decrease if they
are not the same. The VCO is then "locked" on
frequency.
The frequency stability of the synthesizer in both
the receive and transmit modes is established by the
stability of the TCXO. The TCXO is stable over a
temperature range of -30° to +60° C (-22° to +140° F).
4-1
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CIRCUIT DESCRIPTION
RF BPF
RF AMP
RF BPF
Z200
Q200/Q201
Z201
87.85 MHz
MIXER
Q211
CRYSTAL FILTER
IF / 450 kHz FILTER
Z220/Z221
U230
1st LO AMP
840.15-872.15 MHZ
RECEIVER
2nd LO AMP
Q260/Q261
Q240
CLOCK
PWR SET
U902A
U900
DIAG EN
U520B
TRANSMITTER
U901
V FWD
Q520/U130C
U902A
V REV
Q911
U520A
ANTENNA
SWITCH
DRIVER
Q500
LOW-PASS
FILTER
U510
CR540/CR541
DIAG
DIAG
DATA
DATA
TX EN
DIAG EN
TX EN
Q133/Q134
DIAG EN
U130A/B/D
Q135
+9V TX
CLOCK
CNTRL
SEC LO
RX OUT
RX OUT
RX AUDIO
RSSI
RSSI
RSSI
MOD ADJ
Q110/U110
U111
RF EN
+5.5V
+9.6V
RX EN
TCXO
TX IN
Q130
Q131
Q132
Y800
+13.3V
SWITCHED
VCO
RF OUT
Q845
BUFFER/
AMPLIFIER
Q823
+9V
U840
Q843
Q844
Q840
LOWBAND +
LOWBAND CTRL
U800
CLOCK
Q842
T/R PS -
SYNTH DATA
Q841
T/R PS +
MOD INPUT
SYNTH EN
R818
MOD ADJUST
LOCK DET
TEST
+13.3V
+13.3V
Q800
RF IN
SYNTHESIZER
SYNTH OUT
Figure 4-1 TRANSCEIVER BLOCK DIAGRAM
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Part No. 001-3492-001
4-2
VCO
Q820
Q821/Q822
AMPLIFIER
CIRCUIT DESCRIPTION
The DC voltage applied across CR823 comes
from the modulation adjust control R818 on the RF
board. R820 applies a DC biasing voltage to CR822;
C815 provides DC blocking. RF isolation is provided
by C827, R822 and R817.
4.2.1 VOLTAGE-CONTROLLED OSCILLATOR
Oscillator
The VCO is formed by Q820, several capacitors
and varactor diodes, and ceramic resonator L826. It
oscillates at the transmit frequency in transmit mode
and first injection frequency in the receive mode (928960 MHz in transmit and 840.150-872.150 MHz in
receive).
4.2.2 VCO AND REFERENCE OSCILLATOR
MODULATION
Both the VCO and reference oscillator (TCXO)
are modulated in order to achieve a flat frequency
response. If only the VCO were modulated, the phase
detector in U800 would sense the frequency change
and increase or decrease the VCO control voltage to
counteract the change (especially at the lower audio
frequencies). If only the reference oscillator frequency is modulated, the VCO frequency would not
change fast enough (especially at the higher audio frequencies). Modulating both VCO and reference oscillators produces a flat audio response. Potentiometer
R818 sets the VCO modulation sensitivity so that it is
equal to the reference oscillator modulation
sensitivity.
Biasing of Q820 is provided by R823, R824 and
R826. An AC voltage divider formed by C844 and
C845 initiates and maintains oscillation and also
matches Q820 to the tank circuit. Resonator L826 is
grounded at one end to provide shunt inductance to
the tank circuit.
Frequency Control and Modulation
The VCO frequency is controlled by a DC voltage across varactor diode CR824. As voltage across a
reverse-biased varactor diode increases, its capacitance decreases. The VCO frequency increases as the
control voltage increases. The control line is isolated
from tank circuit RF by choke L825. The amount of
frequency change produced by CR824 is controlled by
series capacitor C836.
4.2.3 CASCADE AMPLIFIERS
The output signal on the collector of Q820 is coupled by C846 to buffer amplifier Q821/Q822. This is
a cascade amplifier which provides amplification and
also isolation between the VCO and the stages which
follow. The signal is capacitively coupled from the
collector of Q822 to the base of Q821. The resistors
in this circuit provide biasing and stabilization, and
C852 and C854 are RF bypass capacitors.
The VCO frequency is modulated with the transmit audio/data signal from J201, pin 6 is applied
across varactor diode CR822 which varies the VCO
frequency at an audio rate. Series capacitors C825/
C824 couple the VCO to CR822. R821 provides a
DC ground on the anodes of CR822/CR823, and isolation is provided by R820 and C826. C827 is an RF
bypass.
4.2.4 AMPLIFIER
Amplifier Q823 provides amplification and isolation between the VCO, Receiver and Transmitter.
C851 provides matching between the amplifiers. Bias
for Q823 is provided by R840, R842 and R843.
Inductor L833 and capacitor C860 provide impedance
matching on the output.
The DC voltage across CR823 provides compensation to keep modulation relatively flat over the
entire bandwidth of the VCO. This compensation is
required because modulation tends to increase as the
VCO frequency gets higher (capacitance of CR824/
CR825/CR826/CR827 gets lower). CR823 also balances the modulation signals applied to the VCO and
TCXO. The DAC can be used to adjust the VCO
modulation sensitivity.
4.2.5 VOLTAGE FILTER
Q845 on the RF board is a capacitance multiplier
to provide filtering of the +9.6V supply to the VCO.
R845 provides transistor bias and C842 provides the
4-3
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CIRCUIT DESCRIPTION
capacitance that is multiplied. If a noise pulse or other
voltage change appears on the collector, the base voltage does not change significantly because of C842.
Therefore, base current does not change and transistor
current remains constant. CR840 decreases the charge
time of C842 when power is turned on. This shortens
the start-up time of the VCO. C840 and C841 are RF
decoupling capacitors.
The 928-960 MHz band is divided into two segments, 928-944 MHz and 944-960 MHz. The band
selection is controlled by shift register U840, digital
transistors Q843/Q844 and pin diode CR820 on the
VCO board.
A frequency shift of 87.85 MHz is required to go
from transmit to receive mode and visa versa. Transmit to receive frequency shift is accomplished by programming shift register U840 which drives the digital
transistors Q841/Q842. In Transmit mode, Q841/
Q842 forward bias pin diode CR821 which switches
in an inductive transmission line in parallel with the
VCO resonator causing the VCO frequency to
increase. In Receive mode Q841/Q842 reverse bias
CR821 which switches out the inductive transmission
line and lowers the VCO frequency for the mixer
injection.
4.2.6 VCO FREQUENCY SHIFT
The VCO must be capable of producing frequencies from 840-960 MHz to produce the required
receive injection and transmit frequencies. If this
large of a shift was achieved by varying the VCO control voltage, the VCO gain would be undesirably high.
Therefore, capacitance is switched in and out of the
tank circuit to provide a coarse shift in frequency.
CLOCK
DATA
STROBE
Vss
SERIAL INPUT + PROGRAM LATCHES
EM
RF
IN
RF
IN
PR
NM1
NM2
NM3
12
FB
FB
64/65/72
PRESCALER
DD
FMOD
NF
FRACTIONAL
ACCUMULATOR
MAIN DIVIDERS
PRESCALER
MODULUS
CONTROL
RF
RN
CN
TEST
EM
SM
NR
EM+EA
NORMAL
OUTPUT
CHARGE
PUMP
MAIN
PHASE
DETECTOR
CL
PHP
SPEED-UP
OUTPUT
CHARGE
PUMP
MAIN
REFERENCE
SELECT
CK
12
REF
IN
REFERENCE DIVIDER
SA
PA
EA
AUX
IN
NA
EA
+2
+2
INTEGRAL
OUTPUT
CHARGE
PUMP
+2
RA
SECONDARY
REFERENCE
SELECT
AUXILIARY
PHASE
DETECTOR
AUXILIARY
OUTPUT
CHARGE
PUMP
AUXILIARY DIVIDER
VDDA
SSA
Figure 4-2 U800 SYNTHESIZER BLOCK DIAGRAM
June 1997
Part No. 001-3492-001
PHA
LOCK
12
1/4
PRESCALER
PHI
4-4
CIRCUIT DESCRIPTION
4.2.7 SYNTHESIZER INTEGRATED CIRCUIT
(U800)
Impedance matching between the Z200 and RF
amplifier Q201 is provided by C201, C203 and L200.
CR200 protects the base-emitter junction of Q201
from excessive negative voltages that may occur during high signal conditions. Q200 is a switched constant current source which provides a base bias for
Q201. Q200 base bias is provided by R200/R201.
Current flows through R202 so that the voltage across
it equals the voltage across R200 (minus the base/
emitter drop of Q200). In the transmit mode the
receive +9.6V is removed and Q200 is off. This
removes the bias from Q201 and disables the RF
amplifier in transmit mode. This prevents noise and
RF from being amplified by Q201 and fed back on the
first injection line.
Introduction
Synthesizer chip U800 is shown in Figure 4-2.
This device contains the following circuits: R (reference), Fractional-N, NM1, NM2 and NM3; phase and
lock detectors, prescaler and counter programming
circuitry. The basic operation was described in Section 4.2.1.
Channel Programming
Frequencies are selected by programming the R,
Fractional-N, NM1, NM2 and NM3 in U800 to divide
by a certain number. These counters are programmed
by Loader board or a user supplied programming circuit. More information on programming is located in
Section 3.
Additional filtering of the receive signal is provided by Z201. L201 and C206 provide impedance
matching between Q201 and Z201. Resistor R205 is
used to lower the Q of L201 to make it less frequency
selective.
As previously stated, the counter divide numbers
are chosen so that when the VCO is oscillating on the
correct frequency, the VCO-derived input to the phase
detector is the same frequency as the reference oscillator-derived frequency.
4.3.2 MIXER
First mixer Q211 mixes the receive frequency
with the first injection frequency to produce the
87.85 MHz first IF. Since low-side injection is used,
the injection frequency is 87.85 MHz below the
receive frequency. The RF signal is coupled to the
mixer through C211. L212 and C214 tune the mixer
output to 87.85. R214 lowers the Q of L212.
The VCO frequency is divided by the internal
prescaler and the main divider to produce the input to
the phase detector.
4.2.8 LOCK DETECT
When the synthesizer is locked on frequency, the
SYNTH LOCK output of U800, pin 18 (J201, pin 7) is
3V. When the synthesizer is unlocked, the output is a
less than 1V. Lock is defined as a phase difference of
less than 1 cycle of the TCXO.
4.3.3 FIRST LO AMPLIFIER
The first injection frequency from the VCO is
coupled to the First Local Oscillator (LO) amplifier
Q260/Q261 through C266. L261/C265 match Q260
to the VCO.
4.3 RECEIVER CIRCUIT DESCRIPTION
4.3.1 CERAMIC FILTER, RF AMPLIFIER
Q261 is a switched constant current source which
provides a base bias for Q260. Q261 base bias is provided by R264/R265. Current flows through R263 so
that the voltage across it equals the voltage across
R264 (minus the base/emitter drop of Q261). In the
transmit mode the receive +9.6V is removed and
Q261 is off. This removes the bias from Q260 and
disables the First LO amplifier in transmit mode.
Capacitor C200 couples the receive signal from
the antenna switch to ceramic filter Z200. (The
antenna switch is described in Section 4.4.3.) Z200 is
a bandpass filter that passes only a narrow band of frequencies to the receiver. This attenuates the image
and other unwanted frequencies.
4-5
June 1997
Part No. 001-3492-001
CIRCUIT DESCRIPTION
4.3.4 CRYSTAL FILTER, FIRST IF SECTION
Second IF Filter
Z220 and Z221 form a 2-section, 4-pole crystal
filter with a center frequency of 87.85 MHz and a
-3 dB passband of 8 kHz (12.5 kHz BW) or 15 kHz
(25 kHz BW). This filter establishes the receiver
selectivity by attenuating the adjacent channel and
other signals close to the receive frequency. C223,
C224, and L221 adjust the coupling of the filter.
L222, C226, C227 and R223 provide impedance
matching between the filter and U230.
The output of the internal double-balanced mixer
is the difference between 87.85 MHz and 87.4 MHz
which is 450 kHz. This 450 kHz signal is fed out on
pin 20 and applied to second IF filters Z230 and Z231.
These filters have passbands of 9 kHz (12.5 kHz BW),
or 20 kHz (25 kHz BW) at the -6 dB points and are
used to attenuate wideband noise.
4.3.5 SECOND LO/MIXER/DETECTOR
The output of Z230/Z231 is applied to a limiteramplifier circuit in U230. This circuit amplifies the
450 kHz signal and any noise present; then limits this
signal to a specific value. When the 450 kHz signal
level is high, noise pulses tend to get clipped off by
the limiter; however, when the 450 kHz signal level is
low, the noise passes through the limiter. C233/C234
decouple the 450 kHz signal.
Limiter-Amplifier
Oscillator and Mixer
As shown in Figure 4-3, U230 contains the second oscillator, second mixer, limiter, detector, and
squelch circuitry. The control line from synthesizer
U800 is on U230, pin 4. R250/C252/CR240 stabilize
the base current of the oscillator control line. C243/
C245 provide the feedback for the Colpitts oscillator.
The 87.4 MHz output of the oscillator is on U230, pin
3 and is coupled to buffer Q240. Bias for Q240 is provided by R242/R243/R245. The output of Q240 is
coupled to the auxiliary input of U800, pin 10 to maintain the control line. The 87.85 MHz IF signal is
mixed with the 87.4 MHz second LO to produce the
450 kHz Second IF.
C228
87.85 MHz
20
19
C237
18
RSSI OUTPUT
From the limiter stage the signal is fed to the
quadrature detector. An external phase-shift network
connected to U230, pin 10 shifts the phase of one of
the detector inputs 90° at 450 kHz (all other inputs are
unshifted in phase). When modulation occurs, the frequency of the IF signal changes at an audio rate as
does the phase of the shifted input. The detector,
which has no output with a 90° phase shift, converts
this phase shift into an audio signal. L230 is tuned to
provide maximum undistorted output from the detector. R232 is used to lower the Q of L230. From the
detector the audio and data signal is fed out on pin 8.
The audio/data output of U230, pin 8 is applied to
J201, pin 13.
MIXER
87.4 MHz
CONTROL
Quadrature Detector
OSCILLATOR
17
IF AMP
16
RSSI
MIXER OUT
IF DEC2
IF AMP IN
IF DEC1
IF AMP OUT
15
V CC
AUDIO FB
AUDIO OUTPUT
RSSI FB
Audio/Data Amplifier
VREG
14
LIMITER
13
10
LIMITER IN
QUAD
12
11
The audio/data output of U230, pin 8 is applied
to J201, pin 13.
LIMITER DEC1
LIMITER DEC2
LIMITER OUT
Receive Signal Strength Indicator (RSSI)
L230
U230, pin 5 is an output for the RSSI circuit
which provides a voltage proportional to the strength
of the 450 kHz IF signal. The RSSI voltage is applied
to J201, pin 12.
Figure 4-3 U230 BLOCK DIAGRAM
June 1997
Part No. 001-3492-001
4-6
CIRCUIT DESCRIPTION
4.4 TRANSMITTER CIRCUIT DESCRIPTION
Q520 decreases the input voltage to U510 to lower the
power. The control voltage is isolated from RF by ferrite bead EP510 and C511 decouples RF.
4.4.1 DRIVER
The VCO RF output signal is applied to R846,
R847 and R848 that form a resistive splitter for the
receive first local oscillator and the transmitter. The
VCO signal is then applied to a 50 ohm pad formed by
R500, R501, and R502. This pad provides attenuation
and isolation. Q500 provides amplification and additional isolation between the VCO and transmitter.
Biasing for this stage is provided by R503 and R504,
and decoupling of RF signals is provided by C504.
Impedance matching to the power amplifier is provided by L500/C505.
The forward/reverse power voltages from
U520A/B are also applied to U901 for Diagnostic outputs on J201, pin 14.
The low-pass filter consists of C541, L540,
C542, L541, C543, L542 and C544. The filter attenuates spurious frequencies occurring above the transmit
frequency band. The transmit signal is then fed
through the antenna switch to antenna jack J501.
4.4.3 ANTENNA SWITCH
4.4.2 FINAL, COMPARATOR
The antenna switching circuit switches the
antenna to the receiver in the receive mode and the
transmitter in the transmit mode. In the transmit
mode, +9V is applied to L543 and current flows
through diode CR540, L544, diode CR541, and R540.
When a diode is forward biased, it presents a low
impedance to the RF signal; conversely, when it is
reverse biased (or not conducting), it presents a high
impedance (small capacitance). Therefore, when
CR540 is forward biased, the transmit signal has a
low-impedance path to the antenna through coupling
capacitor C546.
RF module U510 has an RF output of 1 to 5W
and operates on an input voltage from 10-16V.
Power control is provided by U520, U130, Q520
and a stripline directional coupler. The power is
adjusted by Power Set Control of U900 that provides a
reference voltage to U130C. U130C drives Q520 and
PA module U510 when using the DAC. When not
using the DAC, the set voltage is applied through
U902, pin 2.
One end of the stripline directional coupler is
connected to a forward RF peak detector formed by
R535, CR530, C531 and U520A. The other end of the
stripline directional coupler is connected to a reverse
RF peak detector formed by R537, CR531, C534 and
U520B.
L544 and C552 form a discrete quarter- wave
line. When CR541 is forward biased, this quarterwave line is effectively AC grounded on one end by
C552. When a quarter-wave line is grounded on one
end, the other end presents a high impedance to the
quarter-wave frequency. This blocks the transmit signal from the receiver. C545/C546 matches the
antenna to 50 ohms in transmit and receive.
If the power output of U510 decreases due to
temperature variations, etc., the forward peak detector
voltage drops. This detector voltage drop is buffered
by U520A and applied to inverting amplifier U130C
which increases the forward bias on Q520. The
increase on Q520 increases the power output level of
U510. If the power output of U510 increases, the forward peak detector voltage increases and U130C
decreases the forward bias on Q520. The decrease on
Q520 decreases the output power of U510.
4.4.4 TRANSMIT KEY-UP CONTROL
When 3-16V is applied to J201, pin 3 (TX_EN)
is applied to the base of Q133 it turns the transistor on
and causes the collector to go low. This low is on the
base of Q134 and turns the transistor on to apply
+5.5V to U130A, pin 2. C130 and C131 decouple RF.
The +5.5V from Q134 is divided by R132/R133 to
produce a +3.6V reference on U130A, pin 3. C136,
C137, C138 and C139 provide RF decoupling.
The output of CR530 and CR531 are fed to
U520A/B respectively. If the output of either buffer
increases, the increase is applied to the inverting input
of U130C. The output of U130C then decreases and
4-7
June 1997
Part No. 001-3492-001
CIRCUIT DESCRIPTION
Q130, Q131 and Q132 act as switches that turn
on with the RX_EN line. When J201, pin 4 goes low,
Q130 is turned off, which turns on Q131 that turns on
Q132. This applies +13.3V to U130 before the
TX_EN line on J201, pin 3 goes high.
4.5 VOLTAGE REGULATORS
4.5.1 +9.6 AND +5.5V REGULATED
The +3-16V applied on J201, pin 5 is applied to
the base of Q110 turning the transistor on. This
causes the collector to go low and applies a low to the
control line of U110, pin 2 and R110 provides supply
voltage isolation. The +13.3V from J201, pin 2 is on
U110, pin 6 to produce a +5.5V reference output on
U110, pin 4. C110 stabilizes the voltage and C114/
C111 provide RF decoupling. C117 provides RF
bypass and C123 provides RF decoupling. C119
helps to stabilize the voltage when the +5.5V supply
first turned on.
U130B provides the key-up/key-down conditioning circuit. C141/R137 provide a ramp up/ramp down
of the +9V TX during key-up/key-down which
reduces load pull of the VCO during key-up.
The output on U130B, pin 7 is applied to the noninverting input of comparator U130D, pin 12. The
output of U130D, pin 14 is applied to the base of current source Q135. The output of Q135 is on the emitter and is applied back to the inverting input of comparator U130D, pin 13. A decrease or increase at
U130D, pin 13 causes a correction by U130D to stabilize the +9V transmit output. R140/R141 establishes
the reference voltage on U130D, pin 13. C144 provides RF bypass, C143 provides RF decoupling and
C145 stabilizes the output. The +9V transmit voltage
is then distributed to the circuits.
June 1997
Part No. 001-3492-001
The low from the collector of Q110 is also
applied to the control line of U111, pin 2. The +13.3V
from J201, pin 2 is on U111, pin 6 to produce a +9.6V
output on U111, pin 4. C118 provides RF bypass and
C122 provides RF decoupling. C120 helps to stabilize
the voltage when the +9.6V supply first turned on.
4-8
SECTION 5 SERVICING
5.1 GENERAL
5.2 SYNTHESIZER SERVICING
5.1.1 PERIODIC CHECKS
5.2.1 INTRODUCTION
This transceiver should be put on a regular maintenance schedule and an accurate performance record
maintained. Important checks are receiver sensitivity
and transmitter frequency, modulation, and power output. A procedure for these and other tests is located in
Section 6. It is recommended that transceiver performance be checked annually even though periodic
checks are not required by the FCC. During the first
year, make an additional check or two to ensure no
TCXO frequency drifting has occurred.
When there is a synthesizer malfunction, the
VCO is not locked on frequency. When an unlocked
VCO is detected by the lock detector circuit, U800,
pin 18 goes low (0V).
NOTE: The user-supplied circuitry must disable the
transmitter and receiver when an out-of-lock condition is indicated.
When the VCO is unlocked, the fR and fV inputs
to the phase detector are usually not in phase (see Section 4.1.2). The phase detector in U800 then causes
the VCO control voltage to go to the high or low end
of its operating range. This in turn causes the VCO to
oscillate at the high or low end of its frequency range.
5.1.2 SURFACE-MOUNTED COMPONENTS
A large number of the components used on the
transceiver board are the surface-mounted type. Since
these components are relatively small in size and are
soldered directly to the PC board, care must be used
when they are replaced to prevent damage to the component or PC board. Surface-mounted components
should not be reused because they may be damaged by
the unsoldering process.
As shown in Figure 4-1, a loop is formed by
VCO Q820, amplifier Q821/Q822, and the RF IN of
U800. Therefore, if any of these components begin to
malfunction, improper signals appear throughout the
loop. However, correct operation of the counters can
still be verified by measuring the input and output frequencies to check the divide number.
5.1.3 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS
Proceed as follows to check the synthesizer I/O
signals to determine if it is operating properly.
Schematic diagrams and component layouts of
the PC boards used in this transceiver are located in
Section 8. A component locator guide is also provided to aid in component location.
5.2.2 REFERENCE OSCILLATOR
Check the signal at U800, pin 8. It should be
17.5 MHz at a level of approximately 0.5V P-P. If the
TCXO module is defective, it is not serviceable and
must be replaced with a new module as described in
Section 5.1.5.
5.1.4 REPLACEMENT PARTS LIST
A replacement parts list with all the parts used in
this transceiver is located in Section 7. Parts are listed
alphanumerically according to designator. For information on ordering parts, refer to Section 1.8.
5.2.3 VCO
5.1.5 TCXO MODULE NOT SERVICEABLE
Output Level
The ±1.5 PPM TCXO module is not field serviceable. Part changes require a factory recalibration
to ensure that the oscillator stays within its ±1.5 PPM
tolerance.
The output level of Q823 can be measured with
an RF voltmeter or some other type of high impedance
meter. The minimum level after a power splitter at
R846 should be -3 dBm.
5-1
June 1997
Part No. 001-3492-001
SERVICING
Control Voltage
5.3.2 MIXER/DETECTOR
Check the DC voltage at C815 with a channel
near the center of the band. If the VCO is locked on
frequency, this should be a steady DC voltage near
3V. If it is not locked on frequency, it should be near
the lower or upper end of its range (0V or 5.5V).
Data Output
Using a .01 µF coupling capacitor, inject a
87.85 MHz, 1 mV signal, modulated with 1 kHz at
±3 kHz deviation (for 25 kHz radios) ±1.5 kHz (for
12.5 kHz radios) at U230, pin 1. The signal output at
U230, pin 8 should be approximately 150 mV P-P.
Output Frequency
Check the VCO frequency at R841. If the VCO
is locked on frequency, it should be stable on the
transmit channel frequency. If the VCO is not locked
on frequency, the VCO control voltage is probably
near 0V or 5.5V.
NOTE: This signal consists of the 1 kHz modulation
and harmonics of 450 kHz.
RSSI Output
The RSSI output on J201, pin 12 should be <900
mV DC with no signal applied, and >1.8V DC with a
1 mV input signal.
5.2.4 SYNTHESIZER (U800)
Lock Detector
START
When the VCO is locked on frequency, the lock
detect output on J201, pin 7 should be high.
MEASURE CURRENT
AND VOLTAGES
REFER TO SECTION 5.3
NO
OK
5.3 RECEIVER SERVICING
CHECK FUSES AND
WIRE HARNESS CONNECTIONS
YES
CHECK MIXER/
DETECT CIRCUIT
To isolate a receiver problem to a specific section, refer to the troubleshooting flowchart in Figure
5-1. Tests referenced in the flowchart are described in
the following information.
REFER TO SECTION 5.3.2
CHECK DATA
OUTPUT
REFER TO SECTION 5.3.2
NOTE: Supply voltages are provided by the user.
OK
NO
CHECK
U230
YES
CHECK AUDIO
CIRCUIT
5.3.1 SUPPLY VOLTAGES AND CURRENT
REFER TO SECTION 5.3.4
REFER TO SECTION 5.3.3
Measure the supply voltages on the following
pins at interface connector J201:
OK
NO
REPLACE DEFECTIVE
COMPONENT
YES
REFER TO SECTION 5.3.5
CHECK BUFFERS
CRYSTAL FILTERS
Pin 4 - 3-16V DC Receive
Pin 5 - 3-16V DC
OK
Place a DC ammeter in the supply line to the
transceiver and the following maximum currents
should be measured:
REPAIR DEFECTIVE
STAGE
YES
CHECK RF AMP
FIRST MIXER
Pin 4 - 400 µA
Pin 5 - 400 µA
June 1997
Part No. 001-3492-001
NO
REFER TO SECTION 5.3.6
Figure 5-1 RECEIVER SERVICING
5-2
SERVICING
5.3.3 SECOND LO
Place a DC ammeter in the supply line to the
transceiver and the following maximum currents
should be measured:
Verify that the Second LO signal is present at
R245. The Second LO should be at 87.40 MHz and
not less than 250 mV P-P.
Pin 2 - 2.5A maximum
Pin 3 - 400 µA
Pin 5 - 400 µA
5.3.4 AUDIO BUFFER AMP
The Data output on J201, pin 13 should be 100200 mV RMS, with the preceding injection signal. If
these levels are not correct, verify proper adjustment
of L230 (see Section 6.7). The gain of U230 is 2.8 for
25 kHz radios and 5.8 for 12.5 kHz radios.
5.4.2 VCO
1. Check VCO after power splitter for power output.
(Power output should be at least -3 dBm.)
2. Check 9V Transmit (Q135, emitter).
5.3.5 CRYSTAL FILTERS
3. If 9V is not present check Q133/Q134, U130, Q135,
Q130, Q131 and Q132 (see Section 4.4.4).
The 87.85 MHz IF signal is provided to the crystal filters Z220/Z221.
4. Check voltages on Driver Q500.
5.3.6 MIXER
Input = 1.5V DC
Output = 3.5V DC
The mixer converts the RF signal (928-960 MHz)
to 87.85 MHz. The Local Oscillator is provided by
the VCO and Q260/Q261. The level of the LO should
be approximately +3 dBm.
Power output should be at least 2 mW (+3 dBm) at
C506 (50 ohm point).
5.3.7 LOW NOISE AMPLIFIER (LNA)
5.4.3 FINAL AMPLIFIER
The LNA provides approximately 12 dB of gain
at 928-960 MHz. Q200 provides active bias to Q201.
1. Check the voltages on U510.
5.3.8 ANTENNA SWITCH
Pin 2 = 9V DC
Pin 3 = 5.0V DC (varies with power setting)
Pin 4 = 13.3V DC
CR540, CR541, L544, C551 and C552 form a
Pi-network antenna switch. CR540 and CR541 are
reversed biased in Receive Mode.
Power output at C540 should be 7.5-8.0W (+38.7 to
+39 dBm).
5.4 TRANSMITTER SERVICING
5.4.1 SUPPLY VOLTAGES AND CURRENT
5.4.4 ANTENNA SWITCH
Measure the supply voltages on the following
pins of interface connector J201:
1. Check the antenna switch voltages.
Pin 2 - 13.3V DC nominal
Pin 3 - 3-16V DC
Pin 4 - 0.0V DC (while transmitting)
Pin 5 - 3-16V DC
Pin 6 - 2.5V DC ±1%/1.5V P-P max
CR540 = 8.6V DC
CR541 = 8.0V DC
The loss through the Antenna Switch should be 1.9
to 2.1 dB.
5-3
June 1997
Part No. 001-3492-001
SERVICING
5.4.5 MODULATION INPUT
1. Check for audio/data signals at J201, pin 6, Y800,
pin 1 and A840, pin 3.
5.4.6 TCXO
1. Check Y800, pin 1 for 2.5V DC ±1%.
2. Adjust Y800 to set the transmitter to the frequency
of operation.
3. If the frequency cannot be set to the frequency of
operation, replace the TCXO.
START
MEASURE
CURRENT AND
VOLTAGES
OK
CHECK FUSES AND
NO
WIRE HARNESS CONNECTIONS
YES
MEASURE RF
OUTPUT POWER
WATTS
YES
CHECK DEVIATION
(SECTION 5.4.6)
NO
REFER TO
SECTION 5.4.2
OK
CHECK DRIVER
NO
CHECK AUDIO
CIRCUITS
YES
NO
CHECK A840
CHECK FREQUENCY
(SECTION 5.4.7)
OK
YES
NO
CHECK Q500
OK
REFER TO
SECTION 5.4.4
CHECK
POWER MODULE
YES
TRANSMITTER
OK
NO
CHECK U510
OK
YES
REFER TO
SECTION 5.4.5
CHECK
CR540/541
CHECK
ANTENNA SWITCH
NO
OK
Figure 5-2 TRANSMITTER SERVICING
June 1997
Part No. 001-3492-001
5-4
CHECK TCXO
Y800
OFF FREQ
ADJUST OR
CHANGE TCXO
SECTION 6 ALIGNMENT PROCEDURE
6.1 GENERAL
6.4 VCO CONTROL VOLTAGE
Receiver or transmitter alignment may be necessary if repairs are made that could affect tuning.
Alignment points diagrams are located in Figure 6-5
or component layouts are located in Section 8.
1. Connect the test setup shown in Figure 6-1.
2. Adjust R525 fully counterclockwise.
3. Load the synthesizer with the HIGHEST channel
frequency in the band.
Fabricate test cables by referring to Figure 2-1.
This cable should include power and ground, a transmit keying switch that shorts the keying line to
ground, data input and data output. The test setup
must apply the various supply voltages and load the
synthesizer with channel information.
4. Key the transmitter.
5. Verify the voltage at TP800 is < 5V DC.
6. Unkey the transmitter.
6.2 TEST EQUIPMENT
7. Load the synthesizer with the LOWEST channel
frequency in the band.
Modulation Analyzer, HP8901 or equivalent
RF Signal Generator, HP8656 or equivalent
Frequency Counter and "sniffer" probe
Power Meter
Oscilloscope
Digital Multimeter
20 dB Attenuator
Power Supply, HP8264A or equivalent
Audio Analyzer, HP8903A or equivalent
Misc. cables, connectors, attenuators.
8. Key the transmitter.
9. Verify the voltage at TP800 is > 1V DC.
10.Unkey the transmitter.
6.5 TRANSMITTER AND FREQUENCY
NOTE: If the radio is intended to use Diagnostics or is
a Radio/Loader board combination go to Section 6.6.
6.3 INITIAL SETTINGS
1. Connect the test setup shown in Figure 6-1.
1. Adjust power supply voltage to +13.3V DC.
2. Turn off the power supply.
2. Load the synthesizer with a channel frequency in
the MIDDLE of the band.
3. Connect RF and power cables.
3. Key the transmitter.
4. Turn on the power supply.
4. The voltage at J201, pin 2 should be 13.3V DC.
5. Using a DC voltmeter, monitor the DC voltage at
the junction of R812/R814 (wiper of R814), refer to
Figure 6-5.
(Do not transmit for extended periods.)
5. Adjust R525 clockwise for 5.0W ±1W. Adjust voltage and power if necessary.
6. Adjust R814 to 2.1V DC ±0.05V.
6. Check the power at a channel frequency on the
LOW and HIGH ends of the band. The power output should be 4-6W with current less than 2.5A.
7. Verify the bias voltage at J201, pin 6 is +2.5V DC
±0.05V.
6-1
June 1997
Part No. 001-3492-001
ALIGNMENT PROCEDURE
16.Apply a 1 kHz sine-wave. The level should be
within ±2 dB of the reference at 100 Hz.
6.5.1 MODULATION ALIGNMENT
1. Apply a 1V, 100 Hz square-wave to J201, pin 6.
17.Unkey the transmitter.
2. Transmit into the modulation analyzer and observe
modulation output on the oscilloscope. Set the
modulation analyzer high pass filtering OFF and no
less than a 15 kHz low pass filter.
DC
VOLTMETER
COMMUNICATIONS
SERVICE MONITOR
3. Preset R818 to the center position.
5W, 50 OHM
DUMMY LOAD
WATTMETER
MODULATION
ANALYZER
4. Load the synthesizer with a channel frequency at
the MIDDLE of the band.
5. Adjust R818 for a flat square wave.
+7.5V DC
POWER SUPPLY
6. Apply a 100 Hz sine-wave to J201, pin 6. The modulation analyzer should still have the 15 kHz lowpass filter selected.
0-1.5A
DC AMMETER
TX
RX
7. Adjust the audio analyzer output level to achieve a
transmit deviation of:
Figure 6-1 TRANSMITTER TEST SETUP
1.5 kHz for 12.5 kHz BW radios
3.0 kHz for 25 kHz BW radios
6.6 TRANSMITTER/FREQUENCY WITH
LOADER
8. Load the synthesizer with a channel frequency at
the LOW end of the band.
NOTE: If the radio is not intended to use Diagnostics
go to Section 6.5.
9. Input a 100 Hz sine-wave and set a 0 dB reference
on the Modulation Analyzer.
NOTE: Subtract the current drawn by the Test Loader
or any Interface Units from all measurements.
10.Apply a 1 kHz sine-wave. The level should be
within ±2 dB of the reference at 100 Hz.
1. Set the Diagnostic Enable DAC (DAC4) to 255,
(FFh).
11.Load the synthesizer with a channel frequency in
the MIDDLE of the band.
12.Input a 100 Hz sine-wave and set a 0 dB reference
on the Modulation Analyzer.
2. Select a Transmit channel frequency in the MIDDLE of the band. Make sure voltage at J201, pin 2
is 13.3V DC.
13.Apply a 1 kHz sine-wave. The level should be
within ±2 dB of the reference at 100 Hz.
3. Adjust R535 fully clockwise for maximum power
output.
14.Load the synthesizer with a channel frequency in
the HIGH end of the band.
4. Adjust the Power Adjust DAC setting (DAC1) to
set the power output to 5W ±0.3W. Make sure voltage at J201, pin 2 is 13.3V DC.
15.Input a 100 Hz sine-wave and set a 0 dB reference
on the Modulation Analyzer.
June 1997
Part No. 001-3492-001
5. Adjust voltage and power if necessary.
6-2
ALIGNMENT PROCEDURE
6. Repeat Step 5 for channels on the LOW and HIGH
ends of the band.
12.Input a 100 Hz sine-wave and set a 0 dB reference
on the Modulation Analyzer.
7. Power output should be 4.7-5.3W (50% duty cycle)
and current should be less than 2.5A.
13.Apply a 1 kHz sine-wave. The level should be
within ±2 dB of the reference at 100 Hz.
8. Select a Transmit channel frequency in the MIDDLE of the band
14. Select a Transmit channel frequency in the HIGH
end of the band.
9. Adjust the frequency displayed on the Modulation
Analyzer to the desired channel frequency by
adjusting the TCXO (Y801).
15.Input a 100 Hz sine-wave and set a 0 dB reference
on the Modulation Analyzer.
16.Apply a 1 kHz sine-wave. The level should be
within ±2 dB of the reference at 100 Hz.
6.6.1 MODULATION ADJUSTMENT
17.Unkey the transmitter.
1. Apply a 1V, 100 Hz square wave to J201, pin 6.
2. Transmit into the modulation analyzer and observe
modulation output on the oscilloscope. The modulation analyzer should not have any high pass filtering selected and no less than a 15 kHz low pass
filter.
5W, 50 OHM
DUMMY LOAD
J104
3. Select a Transmit channel frequency in the MIDDLE of the band. The DAC value should be "125".
J201
WATTMETER
J102
TEST
CABLE
4. If the square wave is peaked on the edges, adjust
R818 down in value for the flattest square wave.
OSCILLOSCOPE
+7.5V DC
POWER SUPPLY
5. Repeat Steps 3 and 4 for channels on the LOW and
HIGH ends of the band.
COMMUNICATIONS
SERVICE MONITOR
Figure 6-2 TX WITH LOADER TEST SETUP
6. Input a 100 Hz sinewave to J201, pin 6. The modulation analyzer should still have the 15 kHz low
pass filter selected.
6.7 RECEIVER
CAUTION
7. Adjust the audio analyzer output level to achieve a
transmit deviation of:
1.5 kHz for 12.5 kHz radios or
3 kHz for 25 kHz radios.
Do not key the transmitter with the generator connected because severe generator damage may result.
NOTE: All distortion and SINAD measurements are
performed with psophometric audio filtering.
8. Select a Transmit channel frequency at the LOW
end of the band.
1. Connect the test setup shown in Figure 6-3.
9. Input a 100 Hz sine-wave and set a 0 dB reference
on the Modulation Analyzer.
2. Preset tuning slugs of L212 and L222 flush with the
top of the can.
10.Apply a 1 kHz sine-wave. The level should be
within ±2 dB of the reference at 100 Hz.
3. Preset C223 to the center position (slot in-line with
axis of the part).
11.Select a Transmit channel frequency in the MIDDLE of the band.
4. Re-adjust L212 and L222 clockwise 2 turns.
6-3
June 1997
Part No. 001-3492-001
ALIGNMENT PROCEDURE
5. Load the synthesizer with a receive channel frequency at the MIDDLE of the band.
20.Adjust the amplitude of the RF signal generator on
J501 until an 12 dB SINAD level (psophometrically
weighted) is reached.
6. Apply a -47 dBm signal from the RF signal genertor
to J501 on the radio. Adjust deviation for:
1.5 kHz with 1 kHz tone for 12.5 kHz radios
3 kHz with 1 kHz tone for 25 kHz radios.
21.Measure the 12 dB SINAD sensitivity. The RF
input level should be less than -116 dBm (0.35 µV).
NOTE: Maintain these deviation levels throughout the
test when measuring AC levels, SINAD and % distortion, unless otherwise instructed.
COMMUNICATIONS
SERVICE MONITOR
MODULATION
ANALYZER
7. Preset L230 for 2.5V DC ±0.05V at J201, pin 13.
8. Set RF signal generator to -105 dBm, unmodulated.
DC
VOLTMETER
9. Set generator frequency to :
3 kHz below channel center on 12.5 kHz radios
5 kHz below channel center on 25 kHz radios
+13.3V DC
POWER SUPPLY
10.Adjust C223 (first) and L212 for peak RSSI voltage.
(Use 2V scale on DVM.)
11.Apply a -47 dBm signal from the RF signal generator to J501 on the radio with standard deviation levels.
0-3A
DC AMMETER
TX
RX
Figure 6-3 RECEIVER TEST SETUP
12.Adjust L222 for minimum distortion (psophometrically weighted).
22.Load the synthesizer with a receive channel frequency to the LOW end of the band.
13.Set RF signal generator to -105 dBm, unmodulated.
23.Verify the RF generator amplitude level is less than
-116 dBm at 12 dB SINAD.
14.Adjust L212 for peak RSSI voltage. (Use 2V scale
on DVM.)
24.Load the synthesizer with a receive channel frequency to the HIGH end of the band.
15.Apply a -47 dBm signal from the RF signal generator to J501 on the radio with standard deviation levels.
25.Verify the RF generator amplitude level is less than
-116 dBm at 12 dB SINAD.
26.Adjust generator RF level to -120 dBm and measure
DC (RSSI) voltage on J201, pin 12 of the radio
(spec is less than or equal to 0.90V DC).
16.Adjust L230 for maximum receive audio voltage.
17.Verify that the receive audio RMS voltage is
150 mV ±50 mV.
27.Adjust generator RF level to -120 dBm and measure
DC (RSSI) voltage on J201, pin 12 of the radio
(spec is less than or equal to 0.8V DC).
18.Verify that the receive audio DC voltage is
2.5V ±0.3V.
28.Adjust generator RF level to -60 dBm and measure
DC (RSSI) voltage on J201, pin 12 of the radio
(spec is greater than or equal to 1.7V DC).
19.Measure the % distortion
(spec is <3% psophometrically weighted).
June 1997
Part No. 001-3492-001
6-4
ALIGNMENT PROCEDURE
J104
J201
OSCILLOSCOPE
J102
TEST
CABLE
+7.5V DC
POWER SUPPLY
COMMUNICATIONS
SERVICE MONITOR
Figure 6-4 Rx WITH LOADER TEST SETUP
R818
R540
J501
A840
Y800
Z231
Z230
L230
J201
L222
L212
R525
R814
TP800
14
C223
U510
Figure 6-5 ALIGNMENT POINTS DIAGRAM
6-5
June 1997
Part No. 001-3492-001
SECTION 7 PARTS LIST
SYMBOL
NUMBER
DESCRIPTION
SYMBOL
NUMBER
PART
NUMBER
3492 TRANSCEIVER
PART NO. 242-3492-510 (12.5 kHz)
PART NO. 242-3492-530 ( 25 kHz )
A 840 VCO 928-960 MHz
023-3492-540
C 100
C 101
C 110
C 111
C 112
C 113
C 114
C 115
C 116
C 117
C 118
C 119
C 120
C 122
C 123
C 130
C 131
C 132
C 133
C 134
C 135
C 136
C 137
C 138
C 139
C 140
C 141
C 142
C 143
C 144
C 145
C 146
C 170
C 171
C 172
C 173
C 174
C 175
510-3674-220
510-2625-109
510-2625-109
510-3674-220
510-2625-109
510-3674-220
510-3674-220
510-3675-103
510-3675-103
510-3675-103
510-3675-103
510-2625-109
510-2625-109
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-2625-109
510-3675-103
510-2625-109
510-3674-220
510-3674-220
510-3675-103
510-3674-220
510-3609-104
510-3675-103
510-3605-882
510-3674-220
510-3675-103
510-3674-220
510-2625-109
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
22 pF ±5% NPO 0603
1 µF 16V SMD tantalum
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
1 µF 16V SMD tantalum
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
1 µF 16V SMD tantalum
.01 µF ±10% X7R 0603
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
.1 µF ±5% X7R 1206
.01 µF ±10% X7R 0603
.0082 ±10% X7R 0805
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
C 176
C 177
C 178
C 179
C 180
C 181
C 182
C 200
C 201
C 202
C 203
C 204
C 206
C 207
C 210
C 211
C 213
C 214
C 217
C 218
C 219
C 220
C 223
C 224
C 225
C 226
C 227
C 228
C 230
C 231
C 232
C 233
C 234
C 235
C 236
C 237
C 240
C 241
C 242
C 243
C 244
C 245
C 246
C 248
7-1
DESCRIPTION
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
3.3 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
2.2 pF ±0.1pF NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
2.2 pF ±0.1pF NPO 0603
9.1 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
1.5-5 pF SMD ceramic
2.4 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
6.2 pF ±0.1pF NPO 0603
10 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
10 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
47 µF 10V SMD tantalum
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
18 pF ±5% NPO 0603
.001 µF ±10% X7R 0603
15 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
.001 µF ±10% X7R 0603
PART
NUMBER
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3675-103
510-3673-339
510-3675-103
510-3673-229
510-3674-220
510-3675-103
510-3674-220
510-3673-229
510-3673-919
510-3675-103
510-3674-220
510-3674-220
510-3675-103
512-1602-001
510-3673-249
510-3675-103
510-3673-629
510-3673-100
510-3675-103
510-3675-103
510-3675-103
510-3675-103
510-3675-103
510-3675-103
510-3673-100
510-3675-103
510-3675-103
510-2624-470
510-3675-103
510-3674-220
510-3674-180
510-3675-102
510-3674-150
510-3675-103
510-3675-102
June 1997
Part No. 001-3492-001
PARTS LIST
SYMBOL
NUMBER
C 249
C 250
C 251
C 252
C 253
C 261
C 262
C 263
C 264
C 265
C 266
C 267
C 268
C 269
C 270
C 500
C 501
C 502
C 503
C 504
C 505
C 506
C 510
C 511
C 512
C 513
C 514
C 515
C 516
C 517
C 518
C 520
C 521
C 522
C 523
C 524
C 526
C 527
C 528
C 529
C 530
C 531
C 533
C 534
C 540
C 541
C 542
DESCRIPTION
.1 µF ±5% X7R 1206
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
1 µF 16V SMD tantalum
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
5.6 pF ±0.1pF NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
1.8 pF ±0.1pF NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
68 pF ±5% NPO 0603
10 pF ±0.1pF NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
1 µF 16V SMD tantalum
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
10 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
10 pF ±0.1pF NPO 0603
22 pF ±5% NPO 0603
6.2 pF ±5% NPO 0805
4.3 pF ±5% NPO 0805
June 1997
Part No. 001-3492-001
PART
NUMBER
SYMBOL
NUMBER
510-3609-104
510-3675-103
510-3675-103
510-2625-109
510-3675-103
510-3674-220
510-3674-220
510-3674-220
510-3675-103
510-3673-569
510-3674-220
510-3674-220
510-3674-220
510-3675-103
510-3673-189
510-3674-220
510-3675-103
510-3674-680
510-3673-100
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-2625-109
510-3674-220
510-2625-109
510-2625-109
510-3674-220
510-3675-103
510-3674-220
510-3674-220
510-3675-103
510-3674-220
510-3675-103
510-3674-220
510-3674-220
510-3674-220
510-3675-103
510-3673-100
510-3675-103
510-3673-100
510-3674-220
510-3601-629
510-3601-439
C 543
C 544
C 545
C 546
C 547
C 548
C 549
C 550
C 551
C 552
C 800
C 801
C 802
C 803
C 804
C 805
C 806
C 807
C 808
C 809
C 810
C 811
C 812
C 813
C 814
C 815
C 816
C 817
C 818
C 819
C 820
C 821
C 822
C 823
C 840
C 841
C 842
C 843
C 844
C 845
C 846
C 847
C 850
C 851
C 852
C 853
C 854
C 855
7-2
DESCRIPTION
PART
NUMBER
3.9 pF ±5% NPO 0805
3.3 pF ±5% NPO 0805
2.7 pF ±5% NPO 0805
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
68 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
10 pF ±0.1pF NPO 0603
2.4 pF ±5% NPO 0805
10 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
1.5 pF ±5% NPO 0603
2.7 pF ±0.1pF NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
100 pF ±5% NPO 0603
.039 µF ±5% X7R 1206
.0039 µF ±10% X7R 0805
.0039 µF ±10% X7R 0805
1 µF 16V SMD tantalum
22 pF ±5% NPO 0603
10 pF ±0.1pF NPO 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
4.7 µF 10V SMD tantalum
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
510-3601-399
510-3601-339
510-3601-279
510-3674-220
510-3674-220
510-3674-680
510-3675-103
510-3673-100
510-3601-249
510-3673-100
510-3675-103
510-3674-220
510-3675-103
510-3674-220
510-3675-103
510-3675-103
510-3675-103
510-3674-220
510-3674-159
510-3673-279
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-2625-109
510-3674-220
510-3674-101
510-3609-393
510-3605-392
510-3605-392
510-2625-109
510-3674-220
510-3673-100
510-3675-103
510-3674-220
510-2624-479
510-3675-103
510-3675-103
510-3675-103
510-3675-103
510-3675-103
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3675-103
510-3675-103
PARTS LIST
SYMBOL
NUMBER
DESCRIPTION
PART
NUMBER
C 856
C 900
C 901
C 902
C 903
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
.01 µF ±10% X7R 0603
510-3675-103
510-3675-103
510-3675-103
510-3675-103
510-3675-103
CR200
CR240
CR530
CR531
CR540
CR541
CR840
Switching diode SOT-23
Varactor BB535 SOD-323
Hot carrier SOT-23
Hot carrier SOT-23
PIN switch diode SOT-23
PIN switch diode SOT-23
Varactor BB535 SOD-323
523-1504-002
523-5005-022
523-1504-016
523-1504-016
523-1504-001
523-1504-001
523-5005-022
EP130
EP200
EP510
EP511
EP512
EP513
Ferrite bead SMD
Mini cer crystal pin insulator
Ferrite bead SMD
Ferrite bead SMD
Ferrite bead SMD123
Ferrite bead SMD
517-2503-001
010-0345-280
517-2503-001
517-2503-001
517-2503-010
517-2503-001
HW102 Grafoil MHW 806 (25 kHz)
HW104 900 MHz module shield
HW104 4-40 machine panhead ZPS
018-1007-104
017-2225-754
575-1604-010
J 201
J 501
14-pin single row header
Jack right angle PC mount
515-7110-214
142-0701-501
L 200
L 201
L 210
L 211
L 212
L 221
L 222
L 230
L 240
L 260
L 261
L 262
L 500
L 540
L 541
L 542
L 543
L 544
2.2 nH ±10% 0805 SMD
8.2 nH inductor LL2012
22 nH ±10% SMD
15 nH inductor LL21012
270 nH variable SMT
0.39 µH inductor SMD
270 nH variable SMT
680 µH quad coil
120 nH 50 x 80 chip
10 nH ±10% 0805 SMD
2.7 nH ±10% 0805 SMD
10 nH ±10% 0805 SMD
1 µH inductor SMD
8 nH air core inductor SMD
12.5 nH air core inductor SMD
8 nH air core inductor SMD
1 µH inductor SMD
2T 24 AWG 0.08 ID
542-9003-226
542-9003-826
542-9003-227
542-9003-157
542-5103-157
542-9001-398
542-5103-157
542-5102-001
542-9007-121
542-9003-107
542-9003-276
542-9003-107
542-9001-109
542-0030-003
542-0030-004
542-0030-003
542-9001-109
542-0030-002
SYMBOL
NUMBER
7-3
DESCRIPTION
PART
NUMBER
MP101
MP102
MP102
MP107
MP108
MP801
MP806
Heat sink
Grafoil MHW 806
900 MHz shield (25 kHz)
Low pass
Synthisizer bottom shield
VCO can
Crystal filter shield
014-0778-047
018-1007-104
017-2225-754
017-2225-771
017-2225-772
017-2225-751
017-2225-699
Q 100
Q 101
Q 110
Q 130
Q 131
Q 132
Q 133
Q 134
Q 135
Q 200
Q 201
Q 211
Q 240
Q 260
Q 261
Q 500
Q 520
Q 800
Q 840
Q 841
Q 842
Q 843
Q 844
Q 845
Q 911
NPN digital 47k/47 transistor 576-0013-046
PNP digital 10k/47 transistor 576-0013-032
NPN digital 47k/47 transistor 576-0013-046
NPN digital 47k/47 transistor 576-0013-046
NPN digital 47k/47 transistor 576-0013-046
PNP digital 10k/47 transistor 576-0013-032
NPN digital 47k/47 transistor 576-0013-046
PNP digital 10k/47 transistor 576-0013-032
NPN high current SOT-223
576-0006-027
PNP gen purp SC70 MSB1218 576-0013-700
NPN low noise SOT-23
576-0003-636
Dual gate GaAS
576-0006-405
VHF/UHF amp SOT-23
576-0003-634
NPN low noise SOT-23
576-0003-636
PNP gen purp SC70 MSB1218 576-0013-700
Bipolar MMIC SOT-143
576-0003-640
NPN high current SOT-223
576-0006-027
NPN gen purp SC70 MSD1819 576-0013-701
NPN digital 47k/47 transistor 576-0013-046
NPN digital 47k/47 transistor 576-0013-046
NPN digital 47k/47 transistor 576-0013-046
NPN digital 47k/47 transistor 576-0013-046
NPN digital 47k/47 transistor 576-0013-046
NPN gen purp SC70 MSD1819 576-0013-701
NPN Si SOT-23
576-0003-658
R 110
R 111
R 112
R 113
R 114
R 130
R 131
R 132
R 133
R 134
R 135
R 136
R 137
R 138
100k ohm ±5% 0.063W 0603
51k ohm ±5% 0.063W 0603
15k ohm ±5% 0.063W 0603
100k ohm ±5% 0.063W 0603
15k ohm ±5% 0.063W 0603
100k ohm ±5% 0.063W 0603
1k ohm ±5% 0.063W 0603
22k ohm ±5% 0.063W 0603
43k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
150k ohm ±5% 0.063W 0603
150k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
569-0155-104
569-0155-513
569-0155-153
569-0155-104
569-0155-153
569-0155-104
569-0155-102
569-0155-223
569-0155-433
569-0155-103
569-0155-103
569-0155-154
569-0155-154
569-0155-103
June 1997
Part No. 001-3492-001
PARTS LIST
SYMBOL
NUMBER
R 139
R 140
R 141
R 148
R 200
R 201
R 202
R 203
R 205
R 212
R 213
R 214
R 215
R 223
R 230
R 231
R 232
R 233
R 234
R 240
R 241
R 242
R 243
R 244
R 245
R 246
R 247
R 248
R 249
R 250
R 260
R 261
R 262
R 263
R 264
R 265
R 266
R 267
R 500
R 501
R 502
R 503
R 504
DESCRIPTION
470 ohm ±5% 0.063W 0603
3.6k ohm ±5% 0.063W 0603
5.6k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
12k ohm ±5% 0.063W 0603
39k ohm ±5% 0.063W 0603
300 ohm ±5% 0.063W 0603
39k ohm ±5% 0.063W 0603
2.2k ohm ±5% 0.063W 0603
10 ohm ±5% 0.063W 0603
1k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
160 ohm ±5% 0.063W 0603
1.5k ohm ±5% 0.063W 0603
3.3k ohm ±5% 0.063W 0603
2.4k ohm ±5% 0.063W 0603
39k ohm ±5% 0.063W 0603
33k ohm ±5% 0.063W 0603
7.5k ohm ±5% 0.063W 0603
(12.5 kHz BW)
18k ohm ±5% 0.063W 0603
(25 kHz BW)
100 ohm ±5% 0.063W 0603
75k ohm ±5% 0.063W 0603
(12.5 kHz BW Only)
68k ohm ±5% 0.063W 0603
22k ohm ±5% 0.063W 0603
10 ohm ±5% 0.063W 0603
1k ohm ±5% 0.063W 0603
100k ohm ±5% 0.063W 0603
330 ohm ±5% 0.063W 0603
330 ohm ±5% 0.063W 0603
22k ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
2.2k ohm ±5% 0.063W 0603
390 ohm ±5% 0.063W 0603
39k ohm ±5% 0.063W 0603
220 ohm ±5% 0.063W 0603
12k ohm ±5% 0.063W 0603
39k ohm ±5% 0.063W 0603
100k ohm ±5% 0.063W 0603
8.2k ohm ±5% 0.063W 0603
270 ohm ±5% 0.063W 0603
18 ohm ±5% 0.063W 0603
270 ohm ±5% 0.063W 0603
470 ohm ±5% 0.063W 0603
470 ohm ±5% 0.063W 0603
June 1997
Part No. 001-3492-001
PART
NUMBER
SYMBOL
NUMBER
569-0155-471
569-0155-362
569-0155-562
569-0155-103
569-0155-123
569-0155-393
569-0155-301
569-0155-393
569-0155-222
569-0155-100
569-0155-102
569-0155-103
569-0155-161
569-0155-152
569-0155-332
569-0155-242
569-0155-393
569-0155-333
569-0155-752
R 520
R 521
R 522
R 525
R 526
R 527
R 528
R 529
R 531
R 532
R 534
R 535
R 536
R 537
R 540
R 541
R 800
R 801
R 802
R 803
R 804
R 805
R 806
R 808
R 809
R 810
R 811
R 812
R 813
R 814
R 815
R 816
R 817
R 818
R 819
R 820
R 821
R 822
R 823
R 840
R 841
R 842
R 843
R 844
R 845
R 846
R 847
569-0155-183
569-0155-101
569-0155-753
569-0155-683
569-0155-223
569-0155-100
569-0155-102
569-0155-104
569-0155-331
569-0155-331
569-0155-223
569-0155-472
569-0155-222
569-0155-391
569-0155-393
569-0155-221
569-0155-123
569-0155-393
569-0155-104
569-0155-822
569-0155-271
569-0155-180
569-0155-271
569-0155-471
569-0155-471
7-4
DESCRIPTION
470 ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
100k ohm ±5% 0.063W 0603
100k ohm SMD trimmer
10k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10 ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10 ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
1k ohm ±5% 0.063W 0603
51 ohm ±5% 0.063W 0603
1k ohm ±5% 0.063W 0603
51 ohm ±5% 0.063W 0603
100 ohm ±5% 0.75W 2010
47k ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
6.8k ohm ±5% 0.063W 0603
6.8k ohm ±5% 0.063W 0603
6.8k ohm ±5% 0.063W 0603
20 ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
51 ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
16k ohm ±5% 0.063W 0603
100k ohm SMD trimmer
120k ohm ±5% 0.063W 0603
39k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
220k ohm ±5% 0.063W 0603
68k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10 ohm ±5% 0.063W 0603
18k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
3.9k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
3.9k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
4.7k ohm ±5% 0.063W 0603
24 ohm ±5% 0.063W 0603
24 ohm ±5% 0.063W 0603
PART
NUMBER
569-0155-471
569-0155-103
569-0155-104
569-0130-104
569-0155-103
569-0155-103
569-0155-100
569-0155-103
569-0155-100
569-0155-103
569-0155-102
569-0155-510
569-0155-102
569-0155-510
569-0135-101
569-0155-473
569-0155-472
569-0155-472
569-0155-472
569-0155-682
569-0155-682
569-0155-682
569-0155-200
569-0155-472
569-0155-103
569-0155-472
569-0155-510
569-0155-472
569-0155-163
569-0130-104
569-0155-124
569-0155-393
569-0155-103
569-0155-224
569-0155-683
569-0155-103
569-0155-100
569-0155-183
569-0155-103
569-0155-103
569-0155-392
569-0155-103
569-0155-392
569-0155-103
569-0155-472
569-0155-240
569-0155-240
PARTS LIST
SYMBOL
NUMBER
DESCRIPTION
PART
NUMBER
R 848
R 849
R 900
R 901
R 911
R 912
R 913
R 914
24 ohm ±5% 0.063W 0603
24 ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
47k ohm ±5% 0.063W 0603
47k ohm ±5% 0.063W 0603
1k ohm ±5% 0.063W 0603
569-0155-240
569-0155-240
569-0155-103
569-0155-103
569-0155-103
569-0155-473
569-0155-473
569-0155-102
U 110
U 111
U 130
U 230
U 510
U 520
U 800
U 840
U 900
U 901
U 902
Voltage regulator adjustable
Voltage regulator adjustable
Quad op amp SO-14 331
FM IF SA676DK
6W power module 900 MHz
Op amp SO-8 MC33172D
Fractional-N synthesizer
8-stage shift register SOIC
Quad 8-bit TLC5620ID
8-stage shift register SOIC
3 2-chnl analog mux/demux
544-2603-093
544-2603-093
544-2020-017
544-2002-037
544-4001-049
544-2019-017
544-3954-027
544-3016-094
544-2031-014
544-3016-094
544-3016-053
Y 800 17.5 MHz TCXO ±1.5 PPM
518-7009-521
Z 200 944 MHz 3-pole ceramic
Z 201 944 MHz 3-pole ceramic
Z 220 87.85 MHz 4-pole 8 kHz BW
(12.5 kHz BW)
Z 220 87.85 MHz 4-pole 15 kHz BW
(25 kHz BW)
Z 221 87.85 MHz 4-pole 8 kHz BW
(12.5 kHz BW)
Z 221 87.85 MHz 4-pole 15 kHz BW
(25 kHz BW)
Z 230 450 kHz 9 kHz BW ceramic
(12.5 kHz BW)
Z 230 450 kHz 20 kHz BW ceramic
(25 kHz BW)
Z 231 450 kHz 9 kHz BW ceramic
(12.5 kHz BW)
Z 231 450 kHz 20 kHz BW ceramic
(25 kHz BW)
532-2006-040
532-2006-040
532-0009-021
SYMBOL
NUMBER
DESCRIPTION
PART
NUMBER
VCO 928-960 MHz
Part No. 023-3492-540
532-0009-022
532-0009-021
532-0009-022
532-2004-015
532-2004-013
C 820
C 821
C 822
C 824
C 825
C 826
C 827
C 830
C 831
C 832
C 833
C 834
C 835
C 836
C 838
C 840
C 841
C 842
C 844
C 845
C 846
C 850
C 851
C 852
C 853
C 854
C 860
C 861
C 863
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
1.5 pF ±0.1 pF NPO 0603
2 pF ±0.1 pF NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
6.8 pF ±0.1 pF NPO 0603
1 pF ±0.1 pF NPO 0603
22 pF ±5% NPO 0603
4.3 pF ±0.1 pF NPO 0603
1 pF ±0.1 pF NPO 0603
.001 µF ±10% X7R 0603
22 pF ±5% NPO 0603
2.2 pF ±0.1 pF NPO 0603
3.9 pF ±0.1 pF NPO 0603
3.9 pF ±0.1 pF NPO 0603
2.7 pF ±0.1 pF NPO 0603
22 pF ±5% NPO 0603
4.7 pF ±0.1 pF NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
22 pF ±5% NPO 0603
4.3 pF ±0.1 pF NPO 0603
2 pF ±0.1 pF NPO 0603
510-3674-220
510-3674-220
510-3674-220
510-3673-159
510-3673-209
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3673-689
510-3673-109
510-3674-220
510-3673-439
510-3673-109
510-3675-102
510-3674-220
510-3673-229
510-3673-399
510-3673-399
510-3673-279
510-3674-220
510-3673-479
510-3674-220
510-3674-220
510-3674-220
510-3674-220
510-3673-439
510-3673-200
CR820
CR821
CR822
CR824
PIN switch diode SOT
PIN switch diode SOT
Varactor SOD-323 BB535
Varactor SOD-323 BB535
523-1504-001
523-1504-001
523-5005-022
523-5005-022
L 820
L 821
L 822
L 823
L 825
L 826
L 830
L 831
L 832
L 833
68 nH ±10% SMD 0805
68 nH ±10% SMD 0805
68 nH ±10% SMD 0805
68 nH ±10% SMD 0805
68 nH ±10% SMD 0805
Resonator 0.5" long SMD
68 nH ±10% SMD 0805
12 nH inductor LL2012
3.3 nH inductor ceramic
10 nH inductor LL2012
542-9003-687
542-9003-687
542-9003-687
542-9003-687
542-9003-687
542-9004-011
542-9003-687
542-9003-127
542-9003-336
542-9003-107
532-2004-015
532-2004-013
7-5
June 1997
Part No. 001-3492-001
PARTS LIST
SYMBOL
NUMBER
DESCRIPTION
PART
NUMBER
Q 820
Q 821
Q 822
Q 823
NPN transistor NE85619
NPN transistor NE85619
NPN transistor NE85619
NPN transistor NE85619
576-0003-651
576-0003-651
576-0003-651
576-0003-651
R 820
R 821
R 822
R 823
R 824
R 825
R 826
R 827
R 830
R 831
R 832
R 833
R 835
R 836
R 840
R 842
R 843
10k ohm ±5% 0.063W 0603
100 ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
10k ohm ±5% 0.063W 0603
3.3k ohm ±5% 0.063W 0603
10 ohm ±5% 0.063W 0603
150 ohm ±5% 0.063W 0603
10 ohm ±5% 0.063W 0603
4.3k ohm ±5% 0.063W 0603
5.6k ohm ±5% 0.063W 0603
3k ohm ±5% 0.063W 0603
200 ohm ±5% 0.063W 0603
200 ohm ±5% 0.063W 0603
200 ohm ±5% 0.063W 0603
100 ohm ±5% 0.063W 0603
27k ohm ±5% 0.063W 0603
3.9k ohm ±5% 0.063W 0603
569-0155-103
569-0155-101
569-0155-103
569-0155-103
569-0155-332
569-0155-100
569-0155-151
569-0155-100
569-0155-432
569-0155-562
569-0155-302
569-0155-201
569-0155-201
569-0155-201
569-0155-101
569-0155-273
569-0155-392
June 1997
Part No. 001-3492-001
7-6
SECTION 8 SCHEMATICS AND COMPONENT LAYOUTS
GND
TRANSISTOR AND DIODE BASING
REFERENCE TABLE
TRANSISTORS
Part Number
Basing Diagram
Identification
TOP
VIEW
TOP
VIEW
OUT
576-0003-636
576-0003-640
576-0006-027
576-0006-405
576-0013-032
576-0013-046
576-0013-700
576-0013-701
DIODES
523-1504-001
523-1504-002
523-1504-016
523-5005-022
G2
P1F
U72
6D
8C
BR
ZR
IN
G1
TOP
VIEW
TOP
VIEW
GND
TOP
VIEW
4D
5A
5F
5B
NC
INTEGRATED CIRCUITS
8-1
June 1997
Part No. 001-3492-001
SCHEMATICS AND COMPONENT LAYOUTS
LOADER BOARD
023-3240-001
J104
SLEEP/WAKE UP
PROGRAMMING
RX DATA
CONNECTOR
TX DATA
NC
GROUND
RF BOARD
PRG0
GROUND
PRG1
PRG2
10
GROUND
11
GROUND
242-3492-5xx
P101
J1
GROUND
GROUND
+13.3V
+13.3V
TX EN
TX EN
RX EN
RX EN
RF EN
RF EN
MOD IN
MOD IN
SYNTH LOCK
SYNTH LOCK
SYNTH EN
SYNTH EN
DATA
DATA
SYNTH CLOCK
10
SYNTH CLOCK
DIAG EN
11
DIAG EN
RSSI
12
RSSI
DEMOD
13
DEMOD
DIAG
14
DIAG
J102
USER INTERFACE
WIDE BAND IN
WIDE BAND OUT
FREQ SEL
RSSI
+13.3V DC
PTT
CARRIER DETECT
TX DATA IN
GROUND
10
RX DATA OUT
Figure 8-1 LOADER BOARD INTERCONNECT
June 1997
Part No. 001-3492-001
8-2
SCHEMATICS AND COMPONENT LAYOUTS
TELEMETRY RF BOARD
3276 MODEM
P1
J1
GROUND
GROUND
RXD
+13.3V
+13.3V
TXD
TX EN
TX EN
TEST AUDIO
RX EN
RX EN
B+
RF EN
RF EN
GROUND
MOD IN
MOD IN
CTS
SYNTH LOCK
SYNTH LOCK
RTS
SYNTH EN
SYNTH EN
DCD
DATA
DATA
10
B+
SYNTH CLOCK
10
SYNTH CLOCK
11
CS0
DIAG EN
11
DIAG EN
12
CS1
RSSI
12
RSSI
13
CS2
DEMOD
13
DEMOD
14
RSSI
DIAG
14
DIAG
15
DTR PGM
GROUND
ANTENNA
Figure 8-2 MODEM INTERCONNECT
8-3
June 1997
Part No. 001-3492-001
SCHEMATICS AND COMPONENT LAYOUTS
Figure 8-3 TRANSCEIVER COMPONENT LAYOUT (COMPONENT SIDE VIEW)
Figure 8-4 TRANSCEIVER COMPONENT LAYOUT (OPPOSITE COMPONENT SIDE VIEW)
June 1997
Part No. 001-3492-001
8-4
SCHEMATICS AND COMPONENT LAYOUTS
Figure 8-5 SCHEMATIC 1 OF 2
8-5
June 1997
Part No. 001-3492-001
SCHEMATICS AND COMPONENT LAYOUTS
Figure 8-6 SCHEMATIC 2 OF 2
June 1997
Part No. 001-3492-001
8-6
SCHEMATICS AND COMPONENT LAYOUTS
C826
L826
W835
R827
L833
W840
W841
CR824
C836
R823
C831
C830
R840
C833
CR820
C862
R841
C863
R826
C840
C834
C842
R842
Q823
W838
R825
Q820
W826
L821
R843
C846
L830
R824
L820
C861
C860
L832
R833
C844
C845
C841
R830
C854
R836
R831
R832
R835
Q822
Q821
C851
C850
L831
W839
C855
C853
R834
C852
W836
W842
C835
C838
W822
L825
C827
L823
L822
C825
C821
CR821
CR822
W823
C823
R820
W833
C820
W824
W832
C824
CR823
R821
R822
W837
W843
C822
W844
W825
W827
C832
W831
W830
W820
W821
Figure 8-7 VCO COMPONENT LAYOUT
8-7
June 1997
Part No. 001-3492-001
SCHEMATICS AND COMPONENT LAYOUTS
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June 1997
Part No. 001-3492-001
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