Motorola APX 1000 - Figure 3-5. Transceiver (700;800 Mhz) Block Diagram (Power and Control Omitted)

3-6 Theory of Operation: Main Board
Figure 3-5. Transceiver (700/800 MHz) Block Diagram (Power and Control Omitted)
FGU
Transmitter
Receiver
2nd
LO
Digital
RF Atten
Antenna Switch
coupler
Rev
Power
Detector
Log
Amp
FET
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
Indicates Sub-shield
Harmonic
Filter
Driver
Amplifier
*
Abacus
IF Filter
15dB Step Attn
VCO 1 (740-776 MHz)
VCO 2 (794-824 MHz)
VCO 3 (851-885 MHz)
800
800
700 700
LNA
LNA
HPF
Mixer
GPS