Figure 3-5. Transceiver (700/800 Mhz) Block Diagram (Power And Control Omitted) - Motorola APX 1000 Detailed Service Manual

3-6
RF Atten
GPS
Rev
Power
Detector
*
800
700

Figure 3-5. Transceiver (700/800 MHz) Block Diagram (Power and Control Omitted)

Log
Amp
Harmonic
Filter
Digital
coupler
15dB Step Attn
16.8MHz
TRIDENT IC
PRESCALAR
BUFFER
BUFFER
800
LNA LNA
700
Antenna Switch
FET
VCO 1 (740-776 MHz)
LOOP
FILTER
VCO 2 (794-824 MHz)
VCO 3 (851-885 MHz)
PRE
BUFFER
IF Filter
Mixer
HPF
Theory of Operation: Main Board
Indicates Sub-shield
Driver
Amplifier
*
TX
TX
BUFFER
TX LO
RX
RX LO
RX SSI Data
Abacus
RX SSI Frame Sync
2nd
LO
FGU
Transmitter
Receiver
RX SSI Clock