Figure 3-14. Synthesizer Block Diagram (Uhf1/Uhf2); Figure 3-15. Synthesizer Block Diagram (700/800 Mhz) - Motorola APX 1000 Detailed Service Manual

Theory of Operation: Main Board
16.8MHz
BUFFER
16.8MHz
TRIDENT IC
16.8MHz
BUFFER
16.8MHz
TRIDENT IC
16.8MHz REFERENCE CLOCK (To Controller and Abacus IC)
LOOP
FILTER
PRESCALAR
BUFFER

Figure 3-14. Synthesizer Block Diagram (UHF1/UHF2)

16.8MHz REFERENCE CLOCK (To Controller and Abacus IC)
LOOP
FILTER
PRESCALAR
BUFFER

Figure 3-15. Synthesizer Block Diagram (700/800 MHz)

TX VCO
PRE
BUFFER
RX VCO
VCO 1
VCO 2
PRE
VCO 3
BUFFER
TX
BUFFER
UHF TX
UHF RX
TX
BUFFER
7/800 TX
7/800 RX
3-17
TX LO
RX LO
TX LO
RX LO