Figure 3-4. Transceiver (Uhf1 / 7/800) Block Diagram (Power And Control Omitted); Figure 3-5. Transceiver (Uhf1 / Vhf) Block Diagram (Power And Control Omitted) - Motorola APX 7000 Detailed Service Manual

3-4
Main antenna
Aux port
SP2T
Aux

Figure 3-4. Transceiver (UHF1 / 7/800) Block Diagram (Power and Control Omitted)

Main antenna
Aux port
SP2T
Aux

Figure 3-5. Transceiver (UHF1 / VHF) Block Diagram (Power and Control Omitted)

Log
Amp
SP3T Rf Switch
Digital
RF Atten
SP3T
GPS Di-
coupler
Plexer
Rev
Power
Detector
ND
2 HARMONIC FILTER
*
÷ 2
16.8MHz
TRIDENT IC
LOGIC PRESCALAR
EXPANDER
BUFFER
16.8MHz
BUFFER
7/800
UHF1
Log
Amp
SP3T Rf Switch
Digital
RF Atten
SP3T
GPS Di-
coupler
Plexer
Rev
Power
Detector
VHF DIVIDE-BY-2
2 ND HARMONIC FILTER
*
÷ 2
16.8MHz
TRIDENT IC
LOGIC PRESCALAR
EXPANDER
BUFFER
16.8MHz
BUFFER
UHF1
VHF
Theory of Operation: Transceiver Board
Switch
FET
UHF1
Harmonic Driver
Filters Amplifier
FET
7/800
LOOP
FILTER
7/800/UHF1 TX
7/800/UHF1 RX
PRE
BUFFER
RX LO
mixer
Switch
FET
VHF
Harmonic Driver
Filters Amplifier
FET
UHF1
LOOP
VHF TX
FILTER
UHF1 TX
VHF/UHF1 RX
PRE
BUFFER
RX LO
mixer
FGU
Transmitter
Receiver
Indicates Sub-shield
*
TX
BUFFER
TX LO
RX SSI Data
Abacus RX SSI Clock
RX SSI Frame Sync
2nd
LO
FGU
Transmitter
Receiver
Indicates Sub-shield
*
TX
BUFFER
TX LO
RX SSI Data
Abacus RX SSI Clock
RX SSI Frame Sync
2nd
LO