4
Operating Manual Reprint
Description of Operating Functions

Monitor

Press (or Press and hold) the assigned Soft key
momentarily to disable the Tone squelch.

Squelch Off

Press (or Press and hold) the assigned Soft key to
disable the Noise and Tone squelch. Again press (or
Press and hold) the assigned Soft key to resume
normal (quiet) Noise and Tone squelch action.

Low Power

Press (or Press and hold) the assigned Soft key to
set the radio’s transmitter to the “Low Power” mode,
thus extending battery life. Press (or Press and hold)
the assigned Soft key again to return to “High Pow-
er” operation when in difficult terrain.
When the radio’s transmitter is set to “Low Pow-
er” mode, the “Low” icon will be indcated on the
display.

Lock

Press (or Press and hold) the assigned Soft key to
lock the Soft keys (except Lock key); thus, the [A],
[B], [C], and [D] keys can be disabled to prevent ra-
dio settings from being disturbed.

Lamp

Press (or Press and hold) the assigned Soft key to
illuminate the LCD for five seconds.

Channel Up

Press (or Press and hold) the assigned Soft key to
switch to a higher operating channel number.

Channel Down

Press (or Press and hold) the assigned Soft key to
switch to a lower operating channel number.

Scan

The Scanning feature is used to monitor multiple
channels programmed into the transceiver. While
scanning, the radio will check each channel for the
presence of a signal, and will stop on a channel if a
signal is present.
ÌTo activate scanning:
Press (or Press and hold) the assigned Soft key.
The scanner will search the channels, looking for ac-
tive ones; it will pause each time it finds a channel on
which someone is speaking.
ÌTo stop scanning:
Press (or Press and hold) the assigned Soft key.
Operation will revert to the channel to which the CH
knob is set.
Key Function
The VX-420 series provides programmable [A], [B],
[C], and [D] function keys, and both the series
and series provide programmable and
switchs. These “Soft” keys functions can be customized
(set to other functions), via programming by your VER-
TEX STANDARD dealer, to meet your communications/
network requirements. Some features may require the pur-
chase and installation of optional internal accessories. The
possible Soft key programming features are illustrated
below, and their functions are explained in the next chap-
ter. For further details, contact your VERTEX STAN-
DARD dealer.
For future reference, check the box next to each func-
tion that has been assigned to the Soft key on your partic-
ular radio, and keep it handy.
Function Soft Key (Press / Press and Hold)
[A][
B][
C][
D]Side 1 Side 2
Monitor / / / / / /
Squelch Off / / / / / /
Low Power / / / / / /
Lock//// / /
Lamp//// / /
Channel Up//// / /
Channel Down//// / /
Scan / / / / / /
Follow-Me Scan / / / / / /
Dual Watch / / / / / /
Talkaround / / / / / /
Add/Del//// / /
Reset / / / / / /
Speed Dial / / / / / /
Tx Save Off / / / / / /
Call 1 / / / / / /
Call 2 / / / / / /
Call 3 / / / / / /
Code Select//// / /
Code Up//// / /
Code Down//// / /
Emergency – / – / – / – / – / – /
Group / / / / / /
ACC 1 / / / / / /
ACC 2 / / / / / /
Play / / / / / /
Record / / / / / /
Encryption / / / / / /