Icom IC-F121S Adjustment page 6

Adjustment No.
Checking RX
Sensitivity
Adjusting the
Squelch
Checking Squelch
Sensitivity
Adjustment Condition & Tuning
Check that the signal generator level when
the RX frequency bandwidth becomes 12 dB
SINAD, is the value below.
RX Sensitivity
Use the same check method for Narrow
channels also.
set the transceiver to the RX frequency
bandwidth's narrow band center frequency.
Set the signal generator to the settings
below.
Modulation Freq.
WIDE
NARROW
SG Output Level
In this condition, using the adjustment
software, raise the squelch D/A value until
the squelch closes once, then lower the D/A
value again, and adjust until the squelch
opening point.
Check that the squelch opening point value
in the RX frequency bandwidth is as below.
Squelch Sensitivity Less than –10 dBu
Next, reduce the signal generator output
and check that the squelch closes in the RX
bandwidth.
ADJUSTMENT
Less than -10 dBu
1kHz
± 3.5 kHz
± 1.75 kHz
-16.5 dBu
Value Ref. No. CK. Point
Less-10dB
A NT Con
Adj.Soft
SQL
Less-10dB
ANT Con
SP Jack
ANT Con