Frequency Adjustment; Idling Current Adjustment (At 5.0 V) - Icom IC-80AD Service Manual

5-2 FREQUENCY ADJUSTMENT

Select an adjustment item using [2] / [8], then set the adjustment value as specifi ed using [DIAL].
ADJUSTMENT
ADJUSTMENT
ITEM
REFERENCE
FREQUENCY

5-3 IDLING CURRENT ADJUSTMENT (at 5.0 V)

Select an adjustment item using [2] / [8], then set the adjustment value as specifi ed using [DIAL].
ADJUSTMENT
ADJUSTMENT
ITEM
DRIVE AMP
IDLING CURRENT
[VHF BAND]
[UHF BAND]
FINAL AMP
IDLING CURRENT
[VHF BAND]
[UHF BAND]
NOTE: When "IDLING CURRENT" is adjusted, "TRANSMIT POWER" must be re-adjusted too.
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1 1) Set the power supply voltage to 7.4 V.
2) Connect an RF power meter to the antenna connector.
[FR] 3) Loose couple a frequency counter to the antenna connector.
4) While transmitting, adjust the frequency using [DIAL], then push
[BAND] to store the adjustment value.
1 1) Set the power supply voltage to 5.0 V.
2) Connect an RF power meter to the antenna connector.
3) Connect a multimeter between the power supply and transceiver.
4) Set the item [IP5] to "00."
[ID5]
2 • While transmitting, adjust the idling current using [DIAL], then
push [BAND] to store the adjustment value.
3
1 1) Set the power supply voltage to 5.0 V.
2) Connect an RF power meter to the antenna connector.
3) Connect a multimeter between the power supply and transceiver.
[IP5]
2 • While transmitting, adjust the idling current using [DIAL], then
push [BAND] to store the adjustment value.
3
OPERATION
OPERATION
5 - 3
VALUE
440.0000
MHz
(±200 Hz)
VALUE
–
180–230
mA
150–200
mA
–
200–300
mA