Adjustment - Icom IC-4008A Service Manual

5-2 ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
REFERENCE
1 • Operating channel : Ch 35
FREQUENCY • Transmitting
OUTPUT
1 • Operating channel : Ch 35
POWER
• Transmitting
FM
1 • Operating channel : Ch 01
DEVIATION
• Connect an audio generator to the
[MIC] jack and set as:
1 kHz/100 mV rms
• Set an FM deviation meter as:
HPF
LPF
De-emphasis : OFF
Detector
• Set group No.
• Transmitting
2 • Set group No.
• Set an audio generator output level
until the deviation is ±3.5 kHz.
• Transmitting
SQUELCH 1 • Operating channel : Ch 35
• Connect an SSG to J1 on the RF unit
and set as:
Level
Modulation
• Receiving
2 • Set an SSG as
Level
• Receiving
UNIT
Top
panel
RF
RF
: OFF
: 20 kHz or 15 kHz
: (P–P)/2
: 01
: OFF (– –)
Front
panel
: 0.14 µV*
(–124 dBm)
: OFF
:
: OFF
5 - 2
MEASUREMENT
LOCATION
Loosely couple a fre-
quency counter to the
antenna.
Connect an RF power
meter to the RF test
port J1.
Connect an FM devia-
tion meter to the RF
test port J1.
Internal speaker
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
433.925000 MHz RF
9 mW [ITA/–1] RF
470 mW [CSA/–1]
±4.8 kHz RF
10 mV ±3 dB
Front Push
panel and hold
[MODE]
and
[DOWN]
Audio signal Verify
disappears.
C63
R206
R50
Verify