Receiver Adjustment - Icom IC-A23 Service Manual

5-3 RECEIVER ADJUSTMENT

• The follow adjustment must be performed at the "ADJUSTMENT" mode, and turn [DIAL] to start each adjustment and finish
automatically.
ADJUSTMENT
RECEIVER 1 • Operating channel : 3 ch [BF1ADJ] (108.200 MHz)
SENSITIVITY • Connect a standard signal generator to the antenna connector and set as:
Frequency
Level
Modulation
• Connect a external speaker (8 Ω), AC millivoltmeter and distortion meter to the [MIC/SP]
jack.
• Receiving
2 Same adjustment as step 1 for following channels.
• 4 ch [BF2ADJ] (128.200 MHz)
• 5 ch [BF3ADJ] (136.800 MHz)
• 6 ch [BF4ADJ] (161.650 MHz)
NOTE: Tune the SSG's frequency to adjustment frequencies.
SQELCH 1 • Operating channel : 7 ch [ASADJS] (118.000 MHz)
LEVEL • Connect a standard signal generator to the antenna connector and set as:
Frequency
Level
Modulation
• Receiving
2 Same adjustment as step 1 for following channels.
• 8 ch [ASADJT] (136.975 MHz)
• 9 ch [FSADJS] (161.650 MHz)
• 10 ch [FSADJT] (161.650 MHz)
NOTE: Tune the SSG's frequency to adjustment frequencies.
VOR PHASE 1 • Operating channel : 11 ch [VORADJ] (113.000 MHz)
(IC-A23 only) • Connect a standard signal generator to the antenna connector and set as:
Frequency
Level
Modulation
Bearing
VOR OFF 1 • Operating channel : 12 ch [OFFADJ] (113.000 MHz)
(IC-A23 only) • Connect a standard signal generator to the antenna connector and set as:
Frequency
Level
Modulation
Bearing
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
ADJUSTMENT CONDITIONS
: 108.200 MHz
: 1.0 µV* (–107 dBm)
: OFF
: 118.200 MHz
: 0.5 µV* (–113 dBm)
: OFF
: 113.000 MHz
: 0.22 mV* (–60 dBm)
: 9960 Hz, 30 %
30 Hz, 30 %
: FROM, 90˚
: 113.000 MHz
: 7.1 µV* (–90 dBm)
: 9960 Hz, 10 %
30 Hz, 30 %
: FROM, 90˚
5 - 4
ADJUSTMENT
UNIT ADJUST
Top [DIAL]
panel
Top [DIAL]
panel
Top [DIAL]
panel
Top [DIAL]
panel