Figure 3-5. Receiver Block Diagram (Uhf1 And Vhf); Figure 3-6. Receiver Block Diagram (Uhf1 And Uhf2) - ASTRO APX 7000 Basic Service Manual

Sec 1: 3-4
RMT Port
AUX
RMT Port
AUX
PER SW
DPLXR
SP3T 2:1
To
RF/Vocon
Connector

Figure 3-5. Receiver Block Diagram (UHF1 and VHF)

PER SW
DPLXR
SP3T 2:1
To
RF/Vocon
Connector

Figure 3-6. Receiver Block Diagram (UHF1 and UHF2)

Basic Theory of Operation: Analog Mode of Operation
UHF1
VHF
2nd
LO
UHF1
UHF2
2nd
LO
SW
2:1
SSI
ΣΔ ADC Dec.
Filter
18Mhz
LO CLK
CLK
Abacus III
SW
2:1
SSI
ΣΔ ADC Dec.
Filter
18Mhz
LO CLK
CLK
Abacus III