Receiver Adjustment - Icom IC-A110 Service Manual

4-4 RECEIVER ADJUSTMENT

"SQUELCH ADJUSTMENT" must be performed at "SQUELCH ADJUSTMENT MODE".
ADJUSTMENT ADJUSTMENT CONDITION
RX
1 • Operating frequency :
SENSITIVITY
118.000 MHz
• Pre-set L9, L10, L11, L49 on the
MAIN unit to max. CCW.
• Connect an SSG to the antenna
connector and set an SSG as :
Level
Modulation
Mod. depth
• Receiving
2 • Operating frequency :
136.975 MHz
• Receiving
SQUELCH
1 • Enter the "Squelch adjustment
mode".
1): Program 118.000 MHz into
memory channel.
2): Turn power OFF.
3): While pushing [SQL], [TS],
[SCAN], turn power ON.
• Connect an SSG to the antenna
connector and set an SSG as :
Level
Modulation
• Receiving
2 • Set an SSG as :
Level
Modulation
3 • Turn power OFF to cancell the "Squelch adjustment mode".
NOTE: Until turn power OFF, "Squelch adjustment mode" is not cancelled, and once pushing the [SCAN] key,
display indicates "sqADJ02" (threshold level adjustment) or "sqADJ25" (tight level adjustment) repeat-
edly
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
MEASUREMENT
UNIT
Rear
panel
: 1.0 µV
*
(–107 dBm)
: ± 1 kHz
: 30 %
Front
panel
: 0.18 µV
*
(–122 dBm)
: OFF
: 5.6 µV
*
(–92 dBm)
: OFF
4 - 5
LOCATION
Connect an AC milli- Maximum AF output
voltmeter and dis-
tortion meter with 8
Ω load to the exter-
nal [SP] jack.
Maximum AF output
• Verify the display indicates "sqADJ02".
Display
NOTE: If the display shows other, turn
• Push the [SCAN] key to set the thresh-
old level.
• Verify the display indicates "sqADJ25".
• Push the [SCAN] key to set the tight
level.
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
MAIN L9, L10,
level L11, L49
level
[MAIN DIAL] to
"sqADJ02".
R59
select