GME GX294 User Manual

INSTRUCTION MANUAL
GX294
27 MHZ AM MARINE
TRANSCEIVER
Complies with Australian Standard 4367-1996
STANDARD COMMUNICATIONS
PTY. LTD.
Issue 02
CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specifications . . . . . . . . . . . . . . . . . . . . . . 4
Controls & Functions . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . 7
Operating on the 27 MHz Marine Band . . 10
Accessories . . . . . . . . . . . . . . . . . . . . . . . 11
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2
INTRODUCTION
The GME Electrophone GX294 is a high quality 27 MHz AM marine transceiver. The GX294 is wholly designed by Standard Communications Pty. Ltd. in Australia, with special attention being given to providing protection from the harsh marine environment. The outer case is made from non-corrosive UV resistant A.B.S. and all case joins are fitted with neoprene or PVC seals. A new low profile microphone plug has been added, complete
FEATURES
Front mounted speaker with water resistant mylar cone. Designed
specifically for the marine environment, the water resistant front mounted speaker projects the sound forward for greater clarity and less distortion.
Interference Suppression Circuit.
Eliminates impulse noise caused by electrical equipment and outboard motors allowing only crystal clear voice signals to be heard.
Dual Watch. Allows you to monitor both the calling/distress channel (88) AND any other selected channel.
Channel 88 Recall. Provides instant selection of the calling/distress channel at any time.
Electret Microphone. The Electret microphone insert provides a higher voice level and an improved frequency response for crisper, clearer more natural audio.
Miniature microphone plug. Utilises a 6 pin telephone style plug and socket combining superior cord grip strength with a low profile installation.
Ultra bright LED display. The channel display utilises High Intensity Light Emitting Diode technology to produce a display which is easy to read under a wide range of viewing conditions.
with rubber “boot” to resist water ingress. The high intensity LED display provides good visibility under a wide range of viewing conditions. In addition, the GX294 features a Dual Watch facility, instant emergency/call channel 88 selection and an advanced impulse noise suppression circuit (ISC) to provide clean, clear reception under the noisiest electrical conditions.
Superior Receiver Performance. The receiver has been specifically designed to provide high sensitivity to weak signals and superior noise performance with minimum background noise.
Designed specifically for marine use.
The GX294 is NOT a modified CB transceiver. It is entirely purpose designed as a marine transceiver with a non­corrosive housing made from UV Stabilised A.B.S. The housing features neoprene and PVC case seals to reduce the risk of water ingress should the radio be accidentally splashed or exposed to light rain or spray. In addition, the microphone plug/socket cavity is sealed with a rubber “boot” to minimise the possibility of corrosion and the push buttons are part of a rubber membrane to give total water exclusion.
Spare fuse holder. A unique fuse storage bracket installed on the GX294’s rear panel, retains two spare fuses to ensure that you have access to the correct fuse if you should need it.
Built-in Speech Processor Circuitry.
Automatically raises the average level of your transmitted voice for greater clarity and better penetration under poor signal conditions.
Isolated earth chassis. Allows installation in either positive or negative earth vessels.
3
SPECIFICATIONS
GENERAL
Frequency Range:
Frequency Control:
Frequency stability:
No. of channels:
Frequencies fitted:
Antenna Impedance:
Antenna Connector:
Voltage Range:
Nominal Voltage :
Polarity:
Temperature Range:
Internal Speaker:
Extension Speaker:
Channel display:
Current Protection:
Reverse polarity and
overvoltage protection:
Dual Watch Rate:
Dimensions:
TRANSMITTER
RF Output Power:
Modulation Mode :
Modulation Sensitivity:
Frequency response :
Hum and Noise :
Modulation Distortion:
Microphone:
Current consumption:
Harmonic and spurious suppression:
27.68 MHz - 27.98 MHz Phase locked loop
0.001% 12; 10 fitted.
27.68, 27.72, 27.82, 27.86
27.88, 27.90, 27.91, 27.94
27.96, 27.98 MHz 50 Ohm S0-239 panel socket
10.8 - 15.2 Volts DC
12.6 Volts DC Isolated chassis (positive or negative earth) 0° C to 55° C. 8 Ohm Mylar 2 Watt 8 Ohm with 3.5mm mono jack High intensity Red LED 2 Amp 3AG (30mm) fuse plus internal fusible link.
Transient voltage regulator and shunt diode 2 seconds 172mm (W) x 52mm (H) x 173mm (D)
4 Watts maximum legal power AM 60% modulation @ 1 Pascal
-12dB @ 300Hz, -16dB @ 3kHz (relative to 1kHz). Better than -40dB Better than 6% @ 60% modulation Electret type
1.6 Amps @ full modulation Better than -65dBc
RECEIVER
System:
IF Frequencies – 1st:
– 2nd:
Sensitivity :
Maximum S/N:
Selectivity :
Image Rejection:
Intermodulation:
Squelch Range:
AGC Range :
Audio Output:
Current consumption:
Spurious Emissions:
Hum and Noise:
Dual conversion superheterodyne
10.695 MHz 455 kHz
0.5uV for 12dB SINAD (0.35 uV Typical) 50dB @ 1mV input
-36dB @ ± 6kHz, -60dB @ ± 10kHz
-90dB
-60dB Tight = 10uV, Threshhold = 0.2uV Less than 10dB change in Audio output over 1uV to 30mV RF input range. 3 Watts into 8 ohms (10% dist) Full volume = 800mA, Squelched = 350mA
-70dBm
-50dB @ 1mV RF input
4
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