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TK-80
COMPONENTS DESCRIPTION
Ref. No.
Use / Function
D45
LED
D47
Reverse flow
Operation / Condition
Voltage limiter
Ref. No.
Use / Function
D71
Zener diode
D72,73
Reverse flow
prevention
D48
PIN diode
D49
Reverse flow
Operation / Condition
12V voltage shift
prevention
Diode of 10.695MHz level variability
D75
Zener diode
Reduce the output power when
power supply voltage drop
prevention
D76,79
D50,51
Switching
ON in transmit
D52,53
Detection
SSB, CW envelope detection
D54
Detection
AM envelope detection
D55
Detection
AGC squelch detection
D56
Switching
ON in transmit
D59
Detection
Detection of MIC amplifier output
D60,61,63
Reverse flow
prevention
D80
Zener diode
Reduce the output power when
power supply voltage drop
D81~87
Reverse flow
prevention
D88
Zener diode
Over voltage protection
Reverse flow
D500,501
Switching
DDS register selection
prevention
D502
Vari-cap
VCO1
D64
Rectification
DC/DC converter
D503
Switching
VCO1 output
D65
Zener diode
For constant voltage
D504
Vari-cap
VCO2
D66
Surge absorption Protect for transistor of linear
D505
Switching
VCO2 output
amplifier control
D506
Vari-cap
VCO3
D67
LED
Voltage limiting
D507
Switching
VCO3 output
D68
Zener diode
3.6V voltage shift
D800
Detection
Noise detection
D69,70
Reverse flow
D900~902
Reverse flow
prevention
prevention
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