3-6
Theory of Operation:
Transceiver Board
Figure 3-8. Transceiver (UHF2 / VHF) Block Diagram (Power and Control Omitted)
3.1.1
Interconnections
This section describes the various interconnections for the transceiver board.
3.1.1.1 Battery Connector M101
Battery connector M101 solders to the transceiver printed circuit board. The connector has 5 gold
plated contacts that mate with the battery, two contacts for positive, two for negative and one for the
Dig_Battery_Data. Signal descriptions are in
Table 3-1
.
Table 3-1. Battery Connector J3
Pin No.
Signal
Description
1
DC_BATT
Battery positive terminal, nominally 7.5 Vdc
2
Dig_Battery_Data Battery
status, from battery to VOCON
3
Ground
Battery negative terminal, tied to PCB ground
FGU
Transmitter
Receiver
SP3T
SP2T
Aux
GPS Di-
Plexer
Abacus
2nd
LO
Digital
RF Atten
Switch
Driver
Amplifier
SP3T Rf Switch
Harmonic
Filters
coupler
Rev
Power
Detector
Log
Amp
FET
VHF
FET
UHF2
TRIDENT IC
LOGIC
EXPANDER
LOOP
FILTER
PRESCALAR
BUFFER
RX SSI Data
16.8MHz
BUFFER
PRE
BUFFER
÷
2
TX LO
RX LO
TX
BUFFER
2
ND
HARMONIC FILTER
VHF DIVIDE-BY-2
UHF2 TX
VHF/UHF2 RX
*
*
16.8MHz
RX SSI Clock
RX SSI Frame Sync
Indicates Sub-shield
VHF
mixer
Main antenna
Aux port
UHF2
VHF TX
Summary of Contents for ASTRO APX 7000
Page 1: ......
Page 4: ...iv Document History Notes ...
Page 24: ...2 4 Radio Power DC Power Routing VOCON Board Notes ...
Page 98: ...3 74 Theory of Operation Global Positioning System GPS ...
Page 163: ...Troubleshooting Charts PA Failure 5 59 ...
Page 164: ...5 60 Troubleshooting Charts PA Failure ...
Page 276: ...7 58 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 318: ...8 42 Schematics Boards Overlays and Parts Lists Transceiver RF Boards VHF 700 800 Notes ...
Page 380: ...8 104 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 700 800 MHz Notes ...
Page 432: ...8 156 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 VHF Notes ...
Page 458: ...8 182 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 UHF2 Notes ...
Page 498: ...8 222 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 700 800 MHz Notes ...
Page 546: ...8 270 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 VHF Notes ...
Page 606: ...8 330 Schematics Boards Overlays and Parts Lists VOCON Boards Notes ...
Page 638: ...Glossary 10 Glossary Notes ...
Page 643: ......