Icom IC-211 Instruction Manual page 16

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.
TUNING KNOB
The transmit or receive frequency is displayed on 7 segment LEDs down to 100Hz digits.
Rotating the tuning knob clockwise increases the frequency, while turning counter-clockwise
decreases the frequency in 100Hz steps in the USB, LSB and CW modes, and in БК Hz steps
in the FM mode and in the frequency range between 146.000MHz to 147.995MHz.
In the USB, LSB and CW modes and in the frequency range between 144.000.0MHz to
145.999.9MHz, the smaller vernier marks on the knob represent 100Hz.and the large marks
represent 1KHz. One complete rotation of the tuning knob results in a 5KHz frequency
increase or decrease. When you receive your set, calibration of the tuning knob may be
desirable, as the large increments may not correspond exactly to a change of 1KHz displayed
on the LEDs. Exact calibration is not necessary as the displayed LED 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, set a large increment on the tuning scale to line up with the
indicator arrow directly above the scale and then turn ON the power.
To calibrate the scale during operation, if desired, set a large increment on the tuning scale
to line up with the indicator arrow and then push the tuning speed button. By doing so, the
1KHz and 100Hz digits are cleared on the display to show "0".
The tuning knob scale may require recalibration if you:
1. Turn the knob while the frequency is locked by use of the Dial Lock Button.
2. Use the tuning speed button when a large increment is not lined up with the indicator.
3. Turn the knob beyond the band edge.
The 1С-211 provides "automatic revert" for operating convenience. When the frequency
display shows 147.995.0MHz and the tuning knob is turned clockwise, the displayed fre-
quency jumps down to 144.000.0MHz and continues up from there. Likewise, by continu-
ing to turn counter-clockwise beyond the bottom edge of the band, the frequency jumps up
from 144.000.0MHz to 147.995.0MHz and goes down from that point.
The displayed frequency shows the carrier frequency in all modes. Therefore recalibration
of the frequency is unnecessary when the mode is changed.
DIAL LOCK BUTTON
After the 1C-211 is set at a certain frequency for rag chewing, mobile operation, etc., push-
ing the Dial Lock button will illuminate the Dial Lock indicator LED and the VFO is locked
at the displayed frequency, thus inactivating the operation of the tuning knob. To change
the frequency, the Dial Lock must first be disengaged by pushing the dial lock button again.
The Dial Lock indicator LED will go OFF, and the frequency will change with the direction
of the tuning knob rotation. Turning OFF the power will release the Dial Lock and clear the
displayed frequency.
TUNING SPEED BUTTON
In the USB, LSB and CW modes, and between 144.000.0MHz to 145.999.9MHz, pushing the
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