3-6
Theory of Operation:
Main Board
Figure 3-5. Transceiver (700/800 MHz) Block Diagram (Power and Control Omitted)
2nd
LO
TRIDENT IC
LOOP
FILTER
PRESCALAR
BUFFER
RX SSI Data
BUFFER
PRE
BUFFER
TX LO
RX LO
TX
BUFFER
TX
RX
16.8MHz
RX SSI Clock
RX SSI Frame Sync
Abacus
IF Filter
VCO 1 (740-776 MHz)
VCO 2 (794-824 MHz)
VCO 3 (851-885 MHz)
800
800
700 700
LNA
LNA
HPF
Mixer
16.8MHz
FGU
Transmitter
Receiver
Termination
Antenna Switch
coupler
Rev
Power
Detector
Current
Sense
FET
Indicates Sub-shield
Harmonic
Filter
Driver
Amplifier
15dB Step Attn
Circuit
Current
Sensor
Batt. DC Supply
o
DC Supply to FET PA & Driv. Amp.
Power Control Voltage (Vctrl)
7800
GPS
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......