Icom IC-F121S Adjustment page 7

Adjustment No.
Checking
AF Output
Checking RX S/N
Checking
Howling
Checking
Maximum
RX Current
ADJUSTMENT
Adjustment Condition & Tuning
Set the signal generator output level to
+60 dBu. The transceiver and SG connection
is the same as the squelch adjustment above.
Adjust the transceiver volume until the
distortion meter reads 5%.
Check that the AF output value at this point
as below.
AF Output
Set the signal generator output level to
+60 dBu. Adjust the AF volume so that the
AF output is 50% of the rated value.
Check that the RX S/N in the bandwidth is
as the values below.
WIDE
NARROW
Set the signal generator output to +60 dBu
as in RX adjustment, and for non modulation.
set the internal speaker for operation,
and turn the AF volume up to maximum to
check that howling does not occur.
While still in the AF output check status,
rotate the volume control clockwise to
obtain the maximum AF output. Check that the
current consumption at this time is as the
value below.
Max. RX Current
More than 3.5 W
More than 40 dB
More than 34 dB
Less than 1200 mA
Value Ref. No. CK. Point
Over
3.5 W
@ 4 ohm
load
Over 40dB
Over 34dB
Less than
1200mA
ANT Con
SP Jack
ANT Con
SP Jack
ANT Con
Int SP
PWR Con