Receiver Adjustment For Ic-F4/S - Icom IC-F3 Service Manual

5-9 RECEIVER ADJUSTMENT for IC-F4/S

The following adjustment must be performed after "BPF1–BPF4 ADJUSTMENT" in section 5-7.
ADJUSTMENT ADJUSTMENT CONDITIONS
SQUELCH 1 • Operating freq. :
LEVEL 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
Deviation
• Receiving
2 • Turn R92 clockwise to close squelch.
• Receiving
• MAIN unit
Standard signal
generator
: 1 kHz
: ±3.5 kHz (W-type)
±1.75 kHz (N-type)
R92
Squelch
adjustment
MEASUREMENT
UNIT LOCATION
Top Connect an SSG to
panel the antenna connector
and SINAD meter with
an 8 Ω load to the
antenna connector.
see detailed illustration
below
5 - 10
ADJUSTMENT
VALUE
UNIT ADJUST
12 dB SINAD SSG
At the point MAIN
where the audio
signals just
appears.
SINAD meter
Speaker (8 )
,
DC power supply
.
Power supply connection
connect (soldering)
, line here
VR board
Output
level
R92