Figure 3-6. Receiver Block Diagram (Uhf2); Figure 3-7. Receiver Block Diagram (Vhf); Figure 3-8. Receiver Block Diagram (700/800 Mhz) - Motorola APX 3000 Detailed Service Manual
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Also See for APX 3000:
- Basic service manual (144 pages) ,
- User manual (104 pages) ,
- Manual (59 pages)
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Theory of Operation: Main Board
Antenna
15 dB Step
Switch
Attenuator
DIG_CTRL_ATTH
Diplexer
Antenna
Switch
Harmonic
Filter
DIG_CTRL_ATTH
Diplexer
Antenna
Harmonic
15 dB Step
Switch
Attenuator
Filter
DIG_CTRL_ATTH
Diplexer
UHF2
Figure 3-6. Receiver Block Diagram (UHF2)
15 dB Step
Attenuator
VHF
Figure 3-7. Receiver Block Diagram (VHF)
800
SW
SW
SW
700
To GPS
Figure 3-8. Receiver Block Diagram (700/800 MHz)
IF Filter
UHF2
Rx LO
To GPS
IF Filter
VHF
Rx LO
To GPS
800
SW
Rx LO
700
ABACUS III
Dec.
ΣΔ ADC
Filter
2nd
LO
CLK
LO
Abacus III
ABACUS III
Dec.
ΣΔ ADC
Filter
2nd
LO
CLK
LO
Abacus III
IF Filter
ABACUS III
Dec.
ΣΔ ADC
Filter
2nd
LO
CLK
LO
Abacus III
3-7
SSI
18Mhz
CLK
SSI
18Mhz
CLK
SSI
18Mhz
CLK
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Troubleshooting
