T X 3 5 5 0 S
I N S T R U C T I O N M A N UA L
PA G E 3 3
High Voltage Detection
The radio has a built-in, high voltage detection system to
warn you if an overvoltage situation occurs. If the power
supply voltage exceeds 18 volts DC, the channel display will
flash ‘hi dc’ for 5 seconds when the unit is first turned on, or
at the time the voltage exceeds 18 volts. In addition, when
transmitting, the TX indicator will flash and the transmitter
will select low output power.
If the overvoltage warning appears you should switch your
radio OFF and disconnect it from the power source, before
locating the cause of the trouble.
Once the ‘High Voltage’ warning has been triggered, and you
have fixed the source of the problem, you will need to switch
the radio OFF then ON again to reset it.
NOTE:
The power source should never exceed 30 volts.
ANTENNA CONNECTION
It is essential to select a good quality, high efficiency, 477
MHz antenna. A poor quality antenna or one not designed
for the specific frequency band you are using will give very
poor performance.
GME have a wide range of suitable 477 MHz UHF CB
antennas to suit most installations and applications. We
recommend contacting your local GME retailer for advice.
Connect to the antenna cable to the rear antenna socket
using a PL259 coaxial connector.
NOISE SUPPRESSION
The inherent design of FM transceivers results in a high level
of resistance to ignition and electrical interference. However
in some installations it may be necessary to take additional
steps to help reduce or eliminate noise interference.
During installation, try to route the DC battery leads, the
antenna lead or any accessory wires away from the engine
compartment, ignition or alternator wiring. If the noise
continues, it may be necessary to fit a suppression kit in
which case we recommend you consult an auto electrician for
advice specific to your installation.
Higher frequency electrical interference cause by electric
motors can be suppressed directly at the motor terminals.
WIRING
LEVEL
TX3550S Main Wiring
Coax Cable
Extension Speaker
UHF Aerial
RED +
12 V DC
-BLACK
Connector
Plug
Fuse
