Icom IC-720 Instruction Manual page 14

EXAMPLE
If 14.125.0MHz is set with "A" VFO, and the VFO switch
is set to "В" VFO, the frequency readout will show "B"
МЕО5 frequency, but 14.125.0MHz is still stored in "А"
VFO's memory. Returning the VFO switch to "A" VFO
position, and 14.125.0 will be displayed on the readout.
Accordingly, if the switch is placed in the "В" VFO posi-
tion, the frequency that was set with the "В" VFO will
appear. This allows you to set a certain frequency with one
VFO, work up and down the band with the other VFO, and
periodically check the set frequency simply by switching
between "А" апа "В" VFO. И also allows you to search
for a clear frequency with one VFO, while keeping your
operating frequency on the other VFO. When you have
found a clear frequency, switch back to your operating
frequency, inform the station you are in contact with of
the new frequency, and switch back.
It's that simple!
Тһе ІС-720 will perform this operation even on two dif-
ferent bands. A frequency is set in either "A" ог "B" VFO
on one band, the VFO switch is set to the other VFO, and
the band set to any other band you wish to work.
EXAMPLE:
Set "А" VFO to 14.255.0MHz. Set the VFO switch to "В"
VFO. Switch to the 21MHz band. The frequency readout
will read 21.100.0МН2. Operate anywhere you wish with
"В" VFO. When you want to return to 14.255.0.MHz,
switch back to VFO A. The frequency readout will show
14.255.0M Hz.
5-1-6 SIM/DUPLEX SWITCH
This will allow you to operate split transmit/receive fre-
quencies in the same band.
EXAMPLE:
Set "A" VFO to 14.350.0МН2 and "В" VFO to 14.255.0
MHz.
Return the VFO Switch to VFO A then set the Sim/Duplex
Switch to the Duplex position. 14.350.0MHz will shown on
the readout during receive ("А" VFO) and 14.255.0MHz
during transmit ("В" VFO). You are now receiving оп
14.350.0MHz and transmitting on 14.255.0MHz. Setting
the VFO select switch to VFO В to reverses the above.
5-1-7 HAM/GENERAL COVERAGE SWITCH
This two position switch selects the range of frequencies to
be covered by the Band Push Buttons. In the Ham (out)
position the frequencies available are those of the 9 amateur
bands. Pushing either the UP or DOWN buttons increments
the transceiver one ham band at a time. In the general
coverage mode (in) the unit operates as a receiver in the
range .1 to 30MHz. The Band Switches move the frequency
up and down in 1MHz steps.
-12-
5-1-8 BAND CHANGING BUTTON
These buttons labeled UP and DOWN increment the radio
one band at a time in the desired direction. Note that the
normal sideband mode is automatically selected for the
band in use.
5-1-9 VFO EQUALIZING SWITCH X
This switch allows either VFO's to be brought to the exact
frequency of the other VFO without turning the tuning
knob.
FOR EXAMPLE:
Set a VFO to 14.255.0MHz. Go to B VFO and set it to
7.105.0МН2. Go back to A VFO. Push the VFO Equaliz-
ing Switch. Go to VFO В. VFO B's frequency is now the
same as VFO А5 (14.255.0MHz). To reverse this (A the
same as B), push the Function button first.
5-1-10 RIT (RECEIVER INCREMEMTAL 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
а 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
LED is Jit.
The receive frequency is shifted with the RIT knob.
When the RIT knob is in the "0" position, the transmitting
and receiving frequencies are the same. А
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 on the RIT switch
and the RIT LED 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.
When the RIT circuit is on, if the tuning knob is moved by
one increment, the RIT circuit is automatically pulsed off.
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 "A" and "В" VFOs.
5-1-11 DIGITAL DISPLAY READOUT
When the transceiver is first turned on and set in an operat-
ing mode the following readouts will appear:
a. SSB Ка 1!80й0|(Тһ does not hold true if the
Memory Backup is in use.) If the Function Switch is
pushed and then the SSB button USB will be selected.
In that case, the readout will be: