Motorola APX 5000 Service Manual page 183

Basic Theory of Operation: Analog Mode of Operation
RF ANT.
RF ANT.
SP2T
RF/AUX
50 ohm
SP2T
Rx/Tx
To Tx
Reversed
Power
To RF/Vocon/GPS
Connector
Figure 3-2. Receiver Block Diagram (VHF)
AUX ANT.
50 ohm
SP2T
Rx/Tx
To Tx
Reversed
Power
To RF/Vocon/GPS
Connector
Figure 3-3. Receiver Block Diagram (UHF1)
Digital RF
Atten.
VHF
2nd
LO
LO
Synth
Digital RF
Atten.
UHF1
2nd
LO
LO
Synth
VHF
Dec. SSI
Σ∆ ADC
Filter
CLK
18Mhz
Synth
CLK
Abacus III
UHF1
SSI
Dec.
Σ∆ ADC
Filter
CLK
18Mhz
Synth
CLK
Abacus III
Sec 2: 3-3