Icom IC-551D Instruction Manual page 20

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Ш When the IC-551D is first turned ON, the frequency displayed on the readout is the frequency
50.100.0MHz.
FOR EXAMPLE:
When the set is turned ON, 50.100.0 will be displayed on the readout. This will occur whether the
VFO Switch is in either the "А" or "В" or combination VFO position. Rotating the tuning knob
clockwise will increase the frequency, and rotating the tuning knob counterclockwise will decrease
the frequency іп 100Hz steps. (10KHz steps in the FM mode)
Ш Switching from one VFO to the other VFO does not clear the first VFO. The frequency is
retained in the VFO's memory.
FOR EXAMPLE:
If 50.125.0MHz is set with "А" VFO, and the VFO switch is set to "B" VFO, the frequency
readout will show "В" VFO's frequency, but 50.125.0MHz is still stored in "A" VFO's memory.
Returning the VFO Switch to "A" VFO position, and 50.125.0 will be displayed on the readout.
Accordingly, if the switch is placed in the "В" VFO position, the frequency that was set with the
"B" 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 "A" and "B" VFO. | also allows you to search for a clear frequency with one МЕО,
while keeping your operating frequency on the other VFO. When you have found a clear fre-
quency, 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!
RA-TB/RB-TA
These positions will allow you to operate a repeater or split transmit/receive frequencies.
FOR EXAMPLE:
Set "A" VFO to 53.250.0MHz and "В" VFO to 52.250.0MHz. Then set the VFO select to
the RA-TB position. 53.250.0MHz will be shown on the readout during receive ("А" VFO) апа
52.250.0MHz during transmit ("В" VFO). You are now receiving on 53.250.0MHz and transmitt-
ing on 52.250.0MHz, so you can access 52.25/53.25 repeater.
If you change the receiving ("А" VFO) frequency, the transmitting ("В" VFO) frequency does
not follow the receiving frequency. So, set "А" VFO and "В" VFO at the frequencies for repeater
· input/output whenever you change frequency.
FOR EXAMPLE:
If you change the receiving frequency from 53.250MHz to 53.170MHz, the transmitting frequency
will remain at 52.250MHz. So please set "В" VFO to 52.170MHz. Now you can access а 52.17/
53.17 repeater.
Setting the VFO select switch to RB-TA reverses the above.
RIT (RECEIVER INCREMENTAL TUNING)
By using the RIT circuit, you can shift the receive frequency +800Hz either side of the transmit
frequency without moving 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 receiving