Icom IC-211 Instruction Manual page 11

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RIT CONTROL
Shifts the receiver frequency +1KHz either side of the transmit frequency. When the
RIT is ON, the RIT LED is illuminated. The LED also represents the "0" position.
Rotating the control to the (+) side raises the receiver frequency, and rotating to the (—)
side lowers the receiver frequency. With the RIT ON, if the tuning knob is moved
one increment, the RIT circuit is automatically pulsed OFF. Therefore it is not neces-
sary to manually turn OFF the RIT when changing operating frequency. The frequency
shift by tuning the RIT Control is not indicated on the frequency display.
RIT SWITCH
This is a spring-loaded switch for the RIT control. To turn ON the RIT, push down
once. If OFF is desired, push down again. When the RIT is ON, the LED above the RIT
control knob is lit. This also indicates the center position of the RIT control. With the
RIT circuit OFF, the LED is also OFF. Also if the RIT 15 ON and the Tuning Knob is
rotated one increment it will pulse the RIT OFF unless the internal jumper has been
changed. (See page 18.)
NB (NOISE BLANKER) SWITCH
When pulse type noise such as automobile ignition noise is present, set this switch to the
ON (down) position. The noise will be reduced to provide comfortable reception.
AGC (AUTOMATIC GAIN CONTROL) SWITCH
With this switch you can change the time constant on the AGC circuit. With the switch
іп the AGC (up) position, the circuit operates as a "hang" AGC and maintains the AGC
voltage for a specific time, thus it is suitable for SSB reception. With the switch in the
FAST (down) position, the circuit is OFF, and AGC is suitable for stations suffering
from fast fading or operating in the CW mode. (The AGC does not activate in the FM
mode.)
TRANSMIT/RECEIVE (T/R) SWITCH
This switch is for manually switching from transmit to receive and vice versa. Set the
switch to RECEIVE (up) and the IC-211 is in the receive mode. Set the switch to
TRANSMIT (down) and it switches to transmit. When switching with the PTT switch
on the microphone or with the VOX switch set to ON, the T/R switch must be in the
RECEIVE position.
VOX SWITCH |
This switches the VOX circuit ON and OFF. When it is in the ON (down) position, in
SSB, T/R switching is accomplished by means of a voice signal. In CW operation, semi-
break-in switching by means of keying is possible. (The VOX circuit does not activate
in the FM mode.)
DIMMER SWITCH
When this switch is set to ON, the luminosity of the frequency display and the meter
decreases. Therefore, under dim lighting, such as at night, it decreases the luminosity to
a lower level for easy indicator reading.
TUNING CONTROL KNOB
Rotating the TUNING CONTROL KNOB clockwise increases the frequency, while
rotating it counter-clockwise decreases the frequency. Between 144 ~ 146MHz, in the