Icom IC-720A Instruction Manual page 18

In the НАМ band mode
DOWN: 7.100.0 UP: 7.100.0
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3. 600. 0 10. 100. 0
{ и
1. 900. 0 14.100.0
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29. 100. 0 18. 100. 0
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28.100.0 21.100.0
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24. 900. 0 24. 900. 0
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21. 100.0 28. 100.0
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18. 100. 0 29. 100. 0
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14. 100. 0 1. 900. 0
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10. 100.0 3. 600. 0
5-1-11 RIT (RECEIVE INCREMENTAL TUNING)
By using the RIT circuit, you can shift the receive frequency
+800Hz either side of the transmit frequency without mov-
ing the transmit frequency itself. Therefore, when you get
a call slightly off frequency, or when the other station's
frequency has shifted, you can tune in the frequency with-
out disturbing the transmitting frequency. By pushing the
RIT switch once the RIT circuit is turned ON and the RIT
Indicator is lit.
The receive frequency is shifted with the RIT Control knob.
When the RIT Control knob is in the "0" position, the
transmitting and receiving frequencies are the same.
Rotating the control to the (+) side raises the receiving
frequency, and rotating to the (—) side lowers the frequency.
To turn OFF the RIT control, again push the RIT switch
and the RIT Indicator will go OFF. When the RIT circuit is
OFF, the transmit and receive frequencies are the same
regardless of the setting of the RIT control knob.
NOTE: The RIT circuit is operational when the frequency
is locked with the dial lock button. The frequency
shifted by turning the RIT control is not indicated
on the frequency display. When the transmitting
and receiving frequencies differ by more than
800Hz, use "А" and "В" VFOs.
When the RIT circuit is ON, if the tuning knob is moved by
опе increment, the RIT circuit is automatically pulsed ОЕР.
If you do not wish the RIT to pulse OFF automatically
when the tuning knob is turned, the switch shown below
will allow this function. If this is done it is important that
the RIT be at the "0" position during tuning performed
—15—
with the Tuning Knob.
5-2 SSB OPERATION (іп HAM band mode)
5-2-1 RECEIVING:
After connecting an antenna, microphone, etc., set knobs
and switches as follows.
POWER SWITCH OFF (OUT)
HAM BAND/GENERAL
COVER SELECT SWITCH HAM (OUT)
T/R SWITCH RECEIVE (OUT)
VOX SWITCH OFF (OUT)
ATT SWITCH OFF (OUT)
AGC SWITCH SLOW (OUT)
NOISE BLANKER (NB)
SWITCH OFF (OUT)
VFO SWITCH A (OUT)
AF GAIN CONTROL
RF GAIN CONTROL
P.B. TUNE CONTROL
Completely Counterclockwise
Completely Clockwise
OFF or Center (12 o'clock)
position
RIT CONTROL Center (12 o'clock) position
The other controls are unrelated to receiving and need not
be set at this time.
Now turn ON the power switch. The meter lamp will be
illuminated and га 110801) will be shown on the
MODE/F REQUENCY display.
In SSB operation there is both an USB (upper side band)
and an LSB (lower side band). LSB is usually used on the
1.8, 3.5 and 7MHz bands, while USB is usually used on the
10MHz band and above. The IC-720A selects the normally
used sideband according to the band in which you are
operating.
When you wish to operate on another band than the 7MHz
band, push the BAND
UP/DOWN
switches to select the
band you wish to operate.