Icom IC-F3, Service Manual

Page: 22 / 52

5 - 10
F4/S
The following adjustment must be performed after “BPF1–BPF4 ADJUSTMENT” in section 5-7.
5-9 RECEIVER ADJUSTMENT for IC-F4/S
SQUELCH
LEVEL 1
2
• Operating freq. :
400.000 MHz (L-band)
440.000 MHz (ML-band)
470.000 MHz (MH-band)
490.000 MHz (H1/H2-bands)
• Set the SSG as:
Modulation : 1 kHz
Deviation : ±3.5 kHz (W-type)
±1.75 kHz (N-type)
• Receiving
• Turn R92 clockwise to close squelch.
• Receiving
Top
panel
Connect an SSG to
the antenna connector
and SINAD meter with
an 8
Ω
load to the
antenna connector.
12 dB SINAD
At the point
where the audio
signals just
appears.
SSG
MAIN
Output
level
R92
ADJUSTMENT ADJUSTMENT CONDITIONS
UNIT LOCATION
VALUE
UNIT ADJUST
MEASUREMENT ADJUSTMENT
connect (soldering) here
DC power supply
,
.
see detailed illustration
below
Power supply connection
VR board
connect (soldering)
, line here
R92
Squelch
adjustment
Standard signal
generator
SINAD meter
Speaker (8
Ω
)
• MAIN unit