Furuno FS-1570 Service Manual page 157

PLL circuit
The PLL circuit consisting of DDS and PLL, operates with the reference signal of 18
MHz from REF OSC board.
The PLL oscillates at the frequency range from 56.0615 to 81.955 MHz, using four
oscillation coils, T501 to T504. The oscillation frequency depends on the frequency
setting. BAND H/L signal selects the VCO circuit for the lower or higher frequency
range in each band.
BAND Setting frequency (MHz)
1-L 1.6065 to 2.99999
1-H 3.0 to 5.99999
2-L 6.0 to 9.49999
2-H 9.5 to 13.49999
3-L 13.5 to 17.49999
3-H 17.5 to 21.49999
4-L 21.5 to 25.49999
4-H 25.5 to 27.50000
Fig.5.6.2 Input vs. output on W/R Board
5-40
Table 5.6.1 PLL oscillation frequencies
Oscillation frequency (MHz)
56.06150 to 57.45499
57.45500 to 60.45499
60.45500 to 63.95499
63.95500 to 67.95499
67.95500 to 71.95499
71.95500 to 75.95499
75.95500 to 79.95499
79.95500 to 81.95500
5.6 W/R board (05P0734)