Frequency Calibration; Main Dial Brake; Adjustment - Icom IC-RSOOCOL Instruction Manual

12-1 FREQUENCY CALIBRATION
[CALIBRATOR] switch
({CALIBRATOR] pot
12-2 MAIN DIAL BRAKE
ADJUSTMENT
® ADJUSTMENT HOLE
LOCATION
The diagram shows the receiver
is set upside down,
ADJUSTMENT 12
A very accurate frequency counter is necessary to calibrate
the frequency of the IC-R9O00L. However, a simple calibra-
tion may be performed by receiving radio station WWV,
or other standard frequency signals.
The calibration adjusts the reference oscillator. Each band
calibration is therefore unnecessary.
1) Set USB mode.
2) Set the operating frequency to the standard frequency
station minus 1 kHz.
Use a standard frequency below 30 MHz.
EXAMPLE:
When using WWV (10.00000 MHz), adjust the operat-
ing frequency to 9.99900 MHz.
10.00000 MHz — 0.00100 MHz (1 kHz) = 9.99900 MHz
3) Turn ON the [CALIBRATOR] switch.
4) Adjust the [CALIBRATOR] pot for a zero beat.
«Zero beat means that two signals are exactly the same
frequency, resulting in a single audio tone being
emitted.
When you can receive a very accurate station above
1 GHz, calibration can also be performed using the
spectrum scope screen. Use FM or AM mode when using
the spectrum scope screen.
The tension of the main dial may be adjusted to suit your
operating needs.
1) Use a philips head screw driver.
2) The brake adjustment screw is located on the bottom of
the receiver cabinet below the main dial.
3) Turn the brake adjustment screw to a comfortable
tension level while turning the main dial continuously
and evenly in one direction.