Icom IC-F620 Adjustment page 3

Adjustment No.
Preparation for
Checking Modula-
tion Adjustment
Modulation
Balance
Adjustment
Deviation
Adjustment
Adjustment Condition & Tuning
When there is no particular set limits, set
the modulation analyzer for adjustment and
checking as below.
HPF
LPF
De-Emphasis
Detector
Connect the modulation analyzer set at the
above conditions, through the attenuator to
the antenna terminal. Connect an oscillo-
scope, distortion meter and a level meter to
the modulation analyzer's detection output
terminal.
Connect a millivolt meter or a 600 ohm out-
put impedance CR oscillator to the trans-
ceiver's mic terminal.
Use the adjustment software to adjust the
modulation analyzer's detection output
horizontal line so that it becomes a
Straight line as below
Adjust. Freq. Near Center Frequency
Set the CR oscillator to a 1 kHz sine wave,
40mVrms, and input from the external mic
terminal. Set the transceiver to TX and use
the adjustment software to adjust to the
following values.
Adjust. Freq. Near Center Frequency
WIDE
NARROW
ADJUSTMENT
OFF
20 kHz
OFF
(P ± P)/2
± 4.10 ± 0.05 kHz
± 2.10 ± 0.05 kHz
Value Ref. No. CK. Point
Detection Adj.Soft
Output Balance
± 4.05 ~ Adj.Soft ANT Con
±4.15kHz MOD W
± 2.05 ~ MOD N
±2.15kHz
ANT Con