Figure 3-4. Transceiver (Uhf1/Uhf2) Block Diagram (Power And Control Omitted) - Motorola APX 1000 Detailed Service Manual

Theory of Operation: Main Board
GPS
Detector
UHF1

Figure 3-4. Transceiver (UHF1/UHF2) Block Diagram (Power and Control Omitted)

Log
Amp
Harmonic
Filter
Digital
RF Atten
coupler
Rev
Power
15dB Step Attn
*
16.8MHz
TRIDENT IC
PRESCALAR
BUFFER
16.8MHz
BUFFER
LNA
UHF1
Antenna Switch
FET
Driver
Amplifier
LOOP
TX
RX VCO
FILTER
RX
PRE
TX VCO
BUFFER
IF Filter
Mixer
FGU
Transmitter
Receiver
Indicates Sub-shield
*
TX
BUFFER
TX LO
RX SSI Data
Abacus
RX SSI Clock
RX SSI Frame Sync
2nd
LO
3-5