Receive Adjustment - Icom IC-M504 Service Manual

5-4 RECEIVE ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
RECEIVE 1 • Channel
SENSITIVITY • [SQUELCH] : Max. counterclockwise
(Regular • Set the internal speaker OFF in the
receive) SET mode, and connect a distortion
meter with a 4 Ω load to [EXT SP] lead
receptacle.
• Connect an SSG to the antenna con-
nector and set as ;
Frequency : 156.800 MHz
Level
Modulation : 1 kHz
Deviation
• Receiving
SQUELCH 1 • Channel
• [SQUELCH] : Max. counterclockwise
• Connect an SSG to the antenna
connector and set as "RECEIVE
SENSITIVITY" except the signal level.
Level
• Receiving
RECEIVE 1 • [SQUELCH] : Max. counterclockwise
SENSITIVITY • Connect an SSG to the antenna
(DSC receive) connector and set as "RECEIVE
SENSITIVITY" except the frequency.
Freqency
• Set the internal speaker OFF in the
SET mode, and connect a distortion
meter with a 4 Ω load to the ex-
ternal speaker lead.
• Receiving
• ADJUST AND MEASURE POINTS LOCATION (MAIN UNIT)
UNIT
: CH16 (156.800 MHz) MAIN
: 0 dBu (−107 dBm)
: ±3 kHz
: CH16 (156.800 MHz) External
speaker
: −4 dBu (−111 dBm)
MAIN
: 156.525 MHz (CH70)
MEASUREMENT
VALUE
LOCATION
Connect a DC volt Maximum
meter or oscilloscope voltage
to the check point
"CP3".
− Squelch
Connect a DC volt Maximum
meter to the check voltage
point "CP6".
5 - 4
ADJUSTMENT
POINT
UNIT ADJUST
→ →
MAIN L35 L36
(Repeate two times
or more.)
MAIN Turn R214 clockwise
open to close the squelch.
T h e n t u r n R 2 1 4
counter-clockwise to
set the point where
the squelch opens.
MAIN L61 → L62 → L63
(Repeate two times
or more.)
→
L38 L39