Aircraft Radio Sales and Services

     Your Specialists in Avionics, Radio and Navigation Equipment

Located at Building 21, Qantas Avenue, Archerfield Airport, QLD, Australia. Ph:(617) 3277 4500


UHF (Ultra High Frequency)

Q. How do I upgrade my Compatible GME UHF CB Radio to 80 Channels*
80 Channel Upgrade Instructions- 31st May, 2011

The ACMA (Australian Communications and Media Authority) have recently released a new class
licence allowing UHF CB radios to operate on a new 80 channel narrow band standard.

In December 2010, in preparation for this new standard, GME began building UHF CB radios that complied with both the original 40 channel wideband standard and the new 80 channel narrowband
standard. This allowed customers to purchase ‘future proofed’ 40 channel radios prior to the release
of the new standard that could be switched to the new 80 channel standard once it was mandated.

As of June, 2011, owners of compatible radios can now operate on the new 80 channel narrow band

GME radios that are 80-channel compatible can be easily identified by an ’80 Channel Upgradeable
sticker on the packaging and by the following serial number prefixes

Q. Are there any special channels I should know about?
For 477Mhz UHF: channel 5 is your emergency channel, channels 1-8 are your repeater stations (refer below to Simplex and Duplex), channels 21 and 22 are data channels and may not be used for sending or receiving transmissions (new model radios block out these channels) and channel 40 is your highway channel used by most trucks. For 27Mhz CB: channel 9 is your emergency channel and channel 11 is your call channel.

Q. What is VOX?
. VOX stands for Voice Activated Transmissions and allows the operator to have hands-free conversations. The microphone automatically detects your voice or other nearby sound causing the radio to transmit without the need press the PTT (push to talk) button.

Q. What role does Squelch play on a radio?
. Squelch allows the operator to eliminate / close off background noise when there are no signals present. Strong incoming signals override this closed squelch to be heard in the speaker. Opening squelch allows background noise to be heard as well as allowing weaker signals to be received. Weaker signals may come through as a broken or chopped transmission by the squelch action.

Q. What are the group scan and open scan functions?
Open scanning allows the operator to pickup transmissions broadcasted on any of the 40 UHF channels. Group scanning allows the operator to pickup transmissions broadcasted on any of the programmed channels in the radio. Group scan channels may be user or dealer programmable depending on the type of unit and may include any frequency from the UHF band.

Q. What is selcall?
Selcall stands for Selective Calling System. This feature allows the operator to contact an individual or group of radios using coded transmissions known as ANI (auto number ID) to notify the corresponding radio of an incoming call.

Q. What is CTCSS?
CTCSS stands for Continuous Tone Coded Squelch System which provides quiet channel operation by blocking unwanted signals being received except those transmitting on your particular code. There are 38 codes per channel to choose from.

Q. What are Simplex and Duplex?
Simplex transmissions receive and transmit on the same channel as far as the operator’s setup will allow. Duplex transmissions utilise repeater stations around the country to onforward signals giving a greater transmission / receive range. Duplex channels are from 1 to 8 and transmit on one channel and receive on another. Eg: If the radio is set to channel 3, it will receive on channel 3 but transmits thirty channels higher on channel 33 through the repeater stations. All UHF radios have the ability to transmit using Simplex or Duplex.


Garmin and GME equipment available for Land, Sea or Air
Located at Building 21, Qantas Avenue, Archerfield Airport, Brisbane. (Enter off Beatty Road)
Ph: +617 3277 4500 Fax: +617 3277 4001


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GPS and Aircraft Radio Wholesalers, Brisbane, Qld, Australia are Australian distributors of Garmin Aviation GPS, Vertex VX 456 Commercial and CB Radio, CB Radios, Trig Approved Dealer , GME UHF CB Radio Transceivers, Bose Aviation Bluetooth Headsets, PNR and ANR Headsets, GME and ACR ResQLink Personal Locator Beacons, Aircraft Radios, ACR ResQmate PLB, ICOM VHF Air Band Transceivers, Garmin Audio Panels, ICOM CB Radio Transceivers, UHF Handeld Transceivers, Electrophone and Handheld Transceivers, Radio Adaptor Interface Units, CASR 21.M Garmin Panel Mounted Digital Transponders, Car, Truck and Caravan Batteries, LED Lenser Torches including Multifunctional, Head Lamps, Rechargeable, Keyring, Avionics, Archerfield Airport, EIR, Civil Aviation Safety Authority, Bench Repairs, Avionic Installations, Scheduled Maintenance, Avionics Overhaul, CASA