Receive Adjustment - Icom IC-M422 Service Manual

5-4 RECEIVE ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
SENSITIVITY 1 • Channel
• [SQL]
• Connect a distortion meter with a 4 Ω
load to the external speaker lead.
• Push [PA•RX
RX speaker mode ON.
• Connect an SSG to the antenna
connector and set as ;
Frequency : 156.800 MHz
Level
Modulation :1 kHz
Deviation
• Receiving
SQUELCH 1 • Channel
• [SQL]
• Set the SSG as;
Level
• Receiving
UNIT
: CH16 (156.800 MHz) MAIN Connect a DC volt meter
: Max. counterclockwise
] for 1 sec. to turn the
: +10 dBµ
: ±3 kHz
: CH16 (156.800 MHz) MAIN Connect a volt meter or
: Max. counterclockwise
: −12 dBµ
MEASUREMENT
OPERATION
or oscilloscope to the
check point "CP3".
o s c i l l o s c o p e t o t h e
check point "CP5".
5 - 4
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
Maximum MAIN L35, L36, L38,
voltage L39
(Repeate two
times or more.)
1.0 V MAIN R214
L39
L38
Sensitivity
adjustment
L36
L35
R214
Squelch adjustment
CP3
Sensitivity check point
CP5
Squelch check point