Vertex Standard VX-4000U, Руководство по обслуживанию

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1-5
VX-4000 UHF Service Manual
Operating Manual Reprint
Channel Scan
The Scanning feature is used to monitor multiple
signals programmed into the transceiver. While
scanning, the transceiver will check each chan-
nel for the presence of a signal, and will stop on a
channel if a signal is present.
To activate scanning:
m
Press the assigned
PF
button
of the “ Scan ” mo-
mentarily to activate scanning.
m
The scanner will search the channels, looking
for active ones; it will pause each time it finds
a channel on which someone is speaking.
To stop scanning
m
Press the assigned
PF button
of the “ Scan ”.
m
Operation will revert to the channel to which
the
CHANNEL
selector knob is set.
Note: Your dealer may have programmed your
radio to stay on one of the following chan-
nels if you press the
PTT
switch during
scanning pause:
r
Current channel (“Talk Back”)
r
“Last Busy” channel
r
“Priority” channel
r
“Home” channel
r
Scan Start” channel
Dual Watch
The Dual Watch feature is similar to the Scan fea-
ture, except that only two channels are monitored:
r
The current operating channel; and
r
The “Priority” channel.
To activate Dual Watch:
m
Press the assigned
PF
button
of the “ Dual
Watch ”.
m
The scanner will search the two channels; it
will pause each time it finds a channel on
which someone is speaking.
To stop Dual Watch:
m
Press the assigned
PF button
of the “ Dual
Watch ”.
m
Operation will revert to the channel to which
the
CHANNEL
selector knob is set.
A
DVANCED
O
PERATION
ARTS (Auto Range Transpond System)
This system is designed to inform you when you
and another ARTS-equipped station are within
communication range.
During ARTS operation, your radio automatically
transmits for about 1 second every 25 (or 55) sec-
onds (the interval is programmed by Dealer) in
an attempt to Shake hands with the other station.
If you move out of range for more than one min-
utes, your radio senses that no signal has been
received, a ringing beeper will sound. If you sub-
sequently move back into range, as soon as the
other station transmits, your beeper will sound.
The
PF
Button Function
The PF (Programmable Function) button can be
programmed by the dealer to provide two of the
other functions described below.
To activate the primary Accessory function, press
the PF button momentarily. To access the second-
ary Accessory function (which may include the
Alarm), press and hold the PF button for 1.5 sec-
onds or longer.
Call/Reset
When this feature is programmed and a selec-
tive call has been received, momentarily press the
assigned
PF
button
of the “ Call/Reset ” to reset
the flashing indicator and mute the receiver, oth-
erwise press the assigned
PF
button
of the “ Call/
Reset ” to sent your radio’s identification code
(ANI) to the dispatcher.
Talk-Around
The feature causes the assigned
PF button
of the
“ Talk-Around ” to select simplex operation on
semi-duplex channels: the transmit frequency
becomes the same as the receive frequency (re-
gardless of any programmed offset for the chan-
nel).
Note: This feature has no effect on simplex channels.
After pressing the button, “
TA
” is displayed on the
LCD.
Noise Blanker (for VX-4000L)
Because local noise can be particularly trouble-
some in the VHF Low-Band frequency spectrum,
the Low-Band version of the VX-4000 includes a
Noise Blanker feature, which may be toggled on
and off by pressing the assigned
PF
button
of the
“ Noise Blanker ” for the appropriate length of
time.