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I N S T R U C T I O N M A N UA L
G X 4 0 0
ANTENNA INSTALLATION
It is essential to select a good quality, high efficiency, 27 MHz antenna. A poor quality
antenna or one not designed for the specific frequency band you are using will give very
poor performance.
Since the GX400 is capable of being switched between the 27 MHz Marine and the 27 MHz
CB Bands, it is important to connect an antenna suitable for the band you have chosen to use.
Because each band is in a different part of the frequency spectrum it isn’t possible to have a
single antenna that will work well on both bands. You will therefore need to select a suitable
antenna to suit the band you have selected.
GME have a huge range of suitable 27 MHz CB and 27 MHz marine antennas to suit most
installations and applications. We recommend you contact your local dealer for advice.
Connect the antenna cable to the rear antenna socket using a PL259 coaxial connector.
NOTE:
The antenna connector is not waterproof.
EXTENSION SPEAKER
If required an optional 8 Ohm extension speaker can be fitted to the GX400 to extend the
sound to another part of your vessel (e.g. If the radio is mounted inside the cabin, the extension
speaker can be used to monitor incoming calls while outside). When the extension speaker
is plugged in, the internal speaker continues to operate allowing you to hear sound at
both locations.
Plug the extension speaker into the 3.5 mm socket on the rear cable.
NOISE SUPPRESSION
27 MHz AM marine and CB radio systems can be prone to electrical and ignition interference.
The reason is that electrical noise is a form of AM transmission similar to that used by your radio
and your radio’s receiver is very sensitive. In most cases, ignition noise can be greatly reduced
or eliminated by selecting the
Noise Limiter (NL)
key on the radio. In some severe cases,
additional suppression may need to be fitted to the ignition system of your vessel or vehicle,
in which case we recommend you consult an auto or marine electrician for advice specific to
your installation.
Higher frequency electrical interference caused by electric motors and bilge pumps can be
suppressed directly at the motor terminals. Electronic interference caused by other electronic
devices such as fish finders is best minimised by keeping the units, including all wiring and
cables, separate from your GX400.
