Motorola APX 7000 - Adjusting the Volume; Removing and Attaching the Accessory Connector Cover

Theory of Operation: Transceiver Board 3-5
Figure 3-6. Transceiver (UHF1 / UHF2) Block Diagram (Power and Control Omitted)
Figure 3-7. Transceiver (UHF2 / 7/800) Block Diagram (Power and Control Omitted)
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
UHF2
FET
UHF1
TRIDENT IC
LOGIC
EXPANDER
LOOP
FILTER
PRESCALAR
BUFFER
RX SSI Data
16.8MHz
BUFFER
PRE
BUFFER
TX LO
RX LO
TX
BUFFER
2
ND
HARMONIC FILTER
UHF1 TX
UHF1/UHF2 RX
*
*
16.8MHz
RX SSI Clock
RX SSI Frame Sync
Indicates Sub-shield
UHF2
mixer
Main antenna
Aux port
UHF1
UHF2 TX
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
UHF2
FET
7/800
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
7/800/UHF2 TX
7/800/UHF2 RX
*
*
16.8MHz
RX SSI Clock
RX SSI Frame Sync
Indicates Sub-shield
7/800
UHF2
mixer
Main antenna
Aux port