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Operating Manual Reprint
The VX-520U is a frequency-synthesized, micropro-
cessor-controlled FM hand-held portable transceiver pro-
viding up to five watts of power output on up to 32 chan-
nels in the UHF Land Mobile Band. Designed specifically
for commercial and professional applications, the VX-
520U is housed in high-strength die-cast aluminum al-
loy, sealed to MIL-810 C, D & E intrinsically safe (I/S) and
weather-tight specifications.
User selectable features include a four-mode display
with channel name or number, upright or inverted for
easy viewing when on your belt; selective channel scan-
ning, adjustable-pause priority scanning, and variable
transmitter power output.
Other user-selectable features include push-button dis-
play illumination, 2-tone decoder enable/disable (with op-
tional F2D-5 Unit installed), and manual squelch over-
ride. The VX-520U is easily programmed by your dealer
using a Vertex Standard Service Kit with an IBM PC-com-
patible computer.
Please read this manual carefully to become familiar
with the features of the VX-520U.
C
Top panel
( 1 ) VOL Control
This control adjusts the volume of the receiver, and
turns the radio off when rotated fully counterclockwise
to the click-stop
2 ) S/DW Button (Scan/Dual Watch)
Pressing and holding this button more than 2 seconds
(but less than 4 seconds) turns the channel scanner on and
off. Pressing and holding this button more than 4 seconds
activates the Dual Watch feature (explained later).
( 3 ) DISP Button
Pressing and holding this button more than 2 seconds
(but less than 4 seconds) activates functions as pro-
grammed by your dealer and determined by your system
2
& C
requirements (See "P
-P
RE
Pressing and holding this button more than 4 seconds in-
verts the LCD display to either frontward or backward
facing readout (the backward display is convenient for
viewing when wearing the transceiver on your belt).
( 4 ) A/B Toggle Switch
The 32 available channels in the VX-520 can be orga-
nized into 2 Groups with up to 16 channels in each. Tog-
gle this switch to select a group "A" or "B" for operation.
( 5 ) BUSY/TX Indicator
This lamp blinks green when a signal is being received
(or the squelch is opened by pressing the MON RES but-
ton) and red when transmitting. To avoid interference,
do not transmit if the lamp is glowing green. When the
battery almost depleted, this lamp blinks red, indicating
that the battery needs recharging or replacement very
soon.
( 6 ) CH Rotary Selector
This rotary switch selects the operating channel. If a
channel is selected that is not available for operation,
"-- -- -- --" is displayed, accompanied by a rapid warning
beeper (2 beeps/sec.).
( 7 ) Antenna Jack
This threaded-type jack accepts the supplied flexible
antenna. Any other antenna types used here must be de-
signed for the programmed operating frequencies.
( 8 ) Liquid Crystal Display
In addition the channel number name, the display in-
cludes some operating status symbols, indicated in the
diagram below.
", page 6).
F
ROGRAMMED
UNCTIONS
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