Changing The Channel Steps - Vertex Standard VXA-220 Operating Manual

Changing the Channel Steps

The VXA-220's synthesizer provides the option of utiliz-
ing channel steps of 8.33/25 kHz per step (default: 25 kHz).
If you need to change the channel step size, the procedure
to do so is very easy.
First set the VXA-220 to the operating band (NAV or
COM) on which you wish to change the channel steps.
Press the [ F ] key mo-
mentarily, then press the
[ ( SET )] key to acti-
vate the Menu ("SET")
mode.
Rotate the DIAL selec-
tor knob to select Menu
Item "STEP."
Press the [ ENT ( )] key to
enable adjustment of this Menu
item.
Rotate the DIAL selector knob to select the new chan-
nel step size.
When you have made your selection, press the
[ ENT ( )] key to save the new setting, and then press
the PTT key to exit to normal operation.
VXA-220 P VI O
RO
A
DVANCED
F
M
PERATING ANUAL
O
PERATION
Important Note
1) When you select the channel step to 8.33 kHz, the
channel display differs from actual operating fre-
quency; see the chart below. However, the operator
(pilot, tower, control, etc) will call out the frequency
according to what the display indicates.
Operating
Frequency
1 .0000 MHz
1 .0083 MHz
1 .0166 MHz
1 .0250 MHz
1 .0333 MHz
1 .0416 MHz
1 .0500 MHz
1 .0583 MHz
1 .0666 MHz
1 .0750 MHz
1 .0833 MHz
1 .0916 MHz
2) The 8.33 kHz step allows the radio to receive only,
and the transmit function is disabled.
3) The adjacent channel selectivity will be slightly de-
graded while receiving using 8.33 kHz channel steps.
Display
8.33 kHz Step 25 kHz Step
1 .005 MHz 1 .000 MHz
1 .010 MHz
1 .015 MHz
1 .030 MHz 1 .025 MHz
1 .035 MHz
1 .040 MHz
1 .055 MHz 1 .050 MHz
1 .060 MHz
1 .065 MHz
1 .080 MHz 1 .075 MHz
1 .085 MHz
1 .090 MHz
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