Operating Instructions; How To Tune - Icom IC-730 Instruction Manual

SECTION 5 OPERATING INSTRUCTIONS
5 - 1

HOW TO TUNE

The following instructions are for tuning in any mode.
Please read carefully and understand fully before turning
ON your unit. Proper tuning is necessary for optimum
operation.
5 - 1 - 1 FREQUENCY DISPLAY ON EACH MODE
When the set is first turned ON, the following readouts will
appear on the FREQUENCY DISPLAY (when 7MHz and
LSB are selected).
When changing to other modes, the display will be as
follows:
USB:
CW or CW-N (Narrow):
AM:
The displayed frequency shows the carrier frequency.
To avoid the trouble of recalibrating the dial when you
change the operating mode, the displayed frequency is set
to shift to the carrier frequency of each mode automatically.
For the differences of the frequency shifts of the various
modes, refer to the following figure.
When changing to other bands, 100KHz and lower digits of
the frequency display will remain previous ones.
EXAMPLE:
When the frequency display shows 14.255.5MHz, you switch
to the 21MHz band, and the frequency display will show
21.255.5MHz. (When you switch to the 3.5MHz band, it will
show 3.755.5MHz.)
5 - 1 - 2 TUNING CONTROL KNOB
The transmit or receive frequency is displayed on 7 Segment
Electroluminescent display down to 100Hz digits. Rotating
the tuning knob clockwise increases the frequency, while
turning counterclockwise decreases the frequency in which
stops are selected by the TUNING RATE switches, i.e.,
10Hz, 100Hz or 1KHz steps.
7. 1 0 1. 5
7. 0 9 8. 5
7. 1 0 0. 0
7. 1 0 0. 0
-- 11 --
One complete rotation of the tuning knob results in 1KHz
with 10Hz steps, 10KHz with 100Hz steps, or 100KHz with
1KHz steps, frequency increase or decrease.
Exact calibration is not necessary as the displayed frequency
will always be correct but you may calibrate the scale on the
tuning knob for use as an analog type frequency display.
To calibrate the scale during operation, if desired, set the
frequency readout to 0.0KHz, push the dial lock switch, then
set the large increment on the tuning scale to line up with the
indicator arrow and then push the dial lock switch again.
The tuning knob scale may require recalibration if you:
1. Turn the knob while the frequency is locked by use
of the Dial Lock switch.
2. Turn the knob beyond the band edge.
Brake Adjustment
If the knob is too loose or too stiff for comfortable use, you
can adjust the torque by tightening or loosening the brake
adjustment screw accessible from underneath the set.
(It is unnecessary to remove the
bottom cover for the brake adjustment.)
The following instructions should be used to adjust the
tension of the Tuning Knob.
1. The Tuning knob tension will become tighter by turning
the brake adjustment screw clockwise, and will become
looser by turning the screw counterclockwise.
2. While performing this adjustment, the Tuning knob must
be turned continuously as the screw is adjusted in
order to set the tension for a comfortable touch.
The displayed frequency will not go beyond the highest
band edge even by turning the tuning knob clockwise, or
beyond the lowest band edge by turning the knob counter-
clockwise.