Programabie Vfo - Kenwood TM-231A Instruction Manual

To select the desired tuning or scan step size use the fol-
lowing procedure:
1. Press the VFO key to select the VFO mode.
2. Press the F key momentarily. The F indicator should light
in the display.
3. Press the REV/STEP key within 10 seconds of pressing
the F key. The current frequency step size will be dis-
played.
4. Rotate the tuning control or press the UP/DWN switches
on the microphone until the desired tuning step size ap-
pears in the display.
5. To complete the programming of the step size you can
press any key on the front panel except the POWER key,
or simply wait 10 seconds and the microprocessor will
automatically return to the normal frequency display.
The chart below shows how the microprocessor will cor-
rect a new step size.
5, 10, 15, 20 to 12.5, 25 12, 5, 25 to 5, 10, 15, 20
0, 5 "9 0 0
10, 18 12.5 10
20, 25 25 25 20
aa = 37.5 30
50, 55 ne as
60, 65 :
80, 85 87.5 80
90, 95 |
4-2-4. Programmable VFO tuning limits
The TM-231 series radios provide the capability of program-
ming the VFO tuning range, in 1 MHz band segments, as
well a providing a separate programmable band scan func-
tion (See section 4-5). For example you could tell the tran-
sceiver that you only wish to tune the 144.000 MHz and
145.000 MHz band segment by specifying any frequency
with these two segments. The tuning controls, microphone
UP/DWN switches would then only tune within these specif-
ic bands. The procedure for specifying the bands is described
below.
1. Press the VFO key to select ee
the VFO mode. oO
2. Rotate the tuning control
or press the microphone
UP/DWN switches until the
desired lower tuning range
appears in the frequency
display.
For example with the
TM-431 you might want to
select the 432.000 MHz
band, and dial up
432.560 MHz.
3. Press the F key for longer
than 1 second. The F indi- 42 3 6.
cator should begin flashing. aa
17