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TRC-70
D24, 25
MCF switching
Select between receive & transmit.
D26, 33
Crystal filter switching
Select between receive & transmit.
- D27~30
Crystal filter switching
Select between J3E CW mode & H3E.
D31~35
Reverse current protection
D36
Switching
S-meter time-constant select.
/ D37
Reverse current protection
SQL.
D38
MUTE.
D39
Surge voltage absorb for relay.
Speaker relay.
D40, 44
Reverse current protection
KEY.
D45
Reverse current protection
EXT ALC.
D46
ALC protection
EXT ALC.
D47
Relay terminal protection
D48~51
Reverse current protection
MIC terminal (8V line).
D52
Crystal filter switching
D53, 54
CAR switching
Turn ON when, carrier into BM.
D55
Reverse current protection
CW.
D56
TIF switching
TX 1st IF output.
D57
Reverse current protection
8T.
D58
Reverse current protection
D59, 60
H3E CAR switching
Turn ON when H3E transmit. H3E CAR amplifier input.
D64~66
H3E CAR switching
Turn ON when H3E transmit. H3E CAR amplifier output.
D67
1st local switching
TX-RX switching.
Dé68
2nd focal switching
D69
Reverse current protection
LOW PWR ALC1, 2.
D70
Reverse current protection
MED PWR ALC1, 2.
D71, 72
Reverse current protection
D73
Voltage regulater
For DC-DC converter.
D74
Voltage regulater
Voltage supply for IC9, 10 (5V).
D75
Reverse current protection
S-meter, antenna current.
VCO (X58-3720-10) CONTROL UNIT
Component
Use/Function
Operation/Condition/Conpatibility
Q1
VCO1
71.395~78.295MHz.
Q2
VCO1 switching
Turn ON when VCO1 operates.
Q3
VCO2
78.295~85.295MHz.
Q4
VCO2 switching
Turn ON when VCO2 operates.
Q5
VCO3
85.295~93.295MHz.
Q6
VCO3 switching
Turn ON when VCO3 operates.
Q7
vCO4
93.295~101.295MHz.
O8
VCO4 switching
Turn ON when VCO4 operates.
as
VCO buffer amplifier
71.395~101.295MHz.
Di
VCO1 vari-cap
D2
VCO1
switching
Turn ON when VCO1
operates.
D3
VCO2 vari-cap
D4
VCO2 switching
Turn ON when VCO2 operates.
DS
VCO3 vari-cap
D6
VCO3 switching
Turn ON when VCO3 operates.
D7
VCO4 vari-cap
D8
VCO4 switching
Turn ON when VCO4 operates.
31
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