Figure 3-4. Receiver Block Diagram (Uhf2); Figure 3-5. Receiver Block Diagram (700/800 Mhz) - Motorola APX 5000 Service Manual

Sec 1: 3-4
RF ANT.
SP2T
RF/AUX
RF ANT.
SP2T
RF/AUX
AUX ANT.
50 ohm
SP2T
Rx/Tx
To Tx
Reversed
Power
To RF/Vocon/GPS
Connector

Figure 3-4. Receiver Block Diagram (UHF2)

AUX ANT.
50 ohm
SP2T
Rx/Tx
To Tx
Reversed
Power
To RF/Vocon/GPS
Connector

Figure 3-5. Receiver Block Diagram (700/800 MHz)

Basic Theory of Operation: Analog Mode of Operation
Digital RF
Atten.
UHF2
2nd
LO
LO
Synth
800
Digital RF
SW SW
Atten.
700
2nd
LO
LO
Synth
UHF2
SSI
Dec.
Σ∆ ADC
Filter
CLK
18Mhz
Synth
CLK
Abacus III
800
SW SW
700
SSI
Dec.
Σ∆ ADC
Filter
CLK
18Mhz
Synth
CLK
Abacus III