User's Manual

1 0 CH2 only detector
1 1 CH1 only detector
0 0 L
0 1 CH2 only detector
1 0 H
1 0
1 1 CH1 only detector
0 0 L
0 1 H
1 0 H
1 1
1 1 H
Filter Switch Control
On CH1, data for checking PLL Lock, as below.
0 0 1 1 0 0 0 1 0 1 0 0 0 0
2.2 VCO
VCO is circuit with Colpitts Oscillator, oscillates with control voltage by synthesizer and consist of TX and RX.
RX VCO is operating when RX VCO power Switch, TR(Q28) turns on. TX VCO is operating when TX VCO power Switch,
TR Q27) turns on. Control voltage of VCO change pulse voltage generated in Charge Pump of PLL IC to DC voltage as
passing Low Pass Filter (C70, C71, C72, R69, R70).
Frequency range by control power, as table 3.1.
SW
Output
0 OFF
1 ON
MODEL
PLL Control Power Range
frequency range remark
TX 1.3 ~ 4.5 V 450 ~ 470 MHz
SD-5200
RX 1.3 ~ 4.5 V 428.6 ~448.6MHz