
VR-160 O
PERATING
M
ANUAL
15
O
PERATION
F
REQUENCY
N
AVIGATION
The
VR-160
will initially be operating in the “VFO” mode. This is a channelized system
which allows free tuning throughout the currently-selected operating band.
Two basic frequency navigation methods are available on the
VR-160
:
1) T
UNING
D
IAL
Rotation of the
DIAL
knob allows tuning in the pre-programmed
steps established for the current operating band. Clockwise ro-
tation of the
DIAL
knob causes the
VR-160
to be tuned toward
a higher frequency, while counter-clockwise rotation will lower
the operating frequency.
If you press the [
F/W
] key momentarily, then rotate the
DIAL
knob, frequency steps of 1 MHz will be selected. This feature is extremely useful for
making rapid frequency excursions over the wide tuning range of the
VR-160
.
Note
: Do not forget to pull the
DIAL
knob to rotate the
DIAL
knob.
2) S
CANNING
From the VFO mode, press and hold in the
SCAN
switch for
one second to show theVFO scanner bandwidth selections. Ro-
tate the
DIAL
knob to select the desired bandwidth for the VFO
scanner, press the
SCAN
switch briefly to begin scanning to-
ward a higher frequency. The scanner will stop when it receives
a signal strong enough to break through the Squelch threshold.
The
VR-160
will then hold on that frequency according to the setting of the “RESUME”
mode (Set Mode Item 45:
SCAN RESUME
). See page 83 for more details regarding Scan
Operation.
If you wish to reverse the direction of the scan (i.e. toward a lower frequency, instead of a
higher frequency), just rotate the
DIAL
knob one click in the counter-clockwise direction
while the
VR-160
is scanning. The scanning direction will be reversed. To revert to scan-
ning toward a higher frequency once more, rotate the
DIAL
knob one click clockwise.
Press the
SCAN
switch briefly to stop the scanning.
Notice
The
VR-160
may receive very strong signals on the Image frequency. If you expe-
rience interference that you suspect may be coming in via an “image” path, you may
calculate the possible frequencies using the formulas below. This information may
be used in the design of effective countermeasures such as traps, etc.
3.579545 MHz x
n
11.7 MHz x
n
(
n
is an integer: 1, 2, 3, …..)
Содержание VR-160
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