Telephone: 08 9370 5533 -
International: +61 8 9370 5533

Jenal Communications is no longer operating as a company - however some products are still available. Please contact me for more details. All site pages have been left active for information purposes.

Click here to go to our home page Send us an e-mail spacer CM2 Replacement mic for Codan 9323 DM1 DTMF Keypad microphone SC2 Selcall/Telcall Microphone spacer CM1 Replacement mic for Codan 9323 CWID1 Repeater/Beacon controller DT8 DTMF controlled relay unit FA1 Fleetsync controlled interface unit SC12 Aircraft unit SC51 Internal vehicle tracking/selcall unit SC90 Selcall unit for Kenwood TK-90 radios spacer Download manuals here Spares Download schematics here Find radio modifications here

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Definition: Selcall
Definition: Telcall

SC33 - Selcall/Telcall/GPS Display Radio Remote Control Head

Discontinued product - for information only


The SC33 is a versatile unit which can be used to enhance the operation of many different types of radio. The unit adds capabilities such as Selcall and GPS location (for tracking - requires a separate GPS receiver) and can also control scanning or channel selection for some radios (depending on the channel control interface). The built in 1 Watt audio amplifier (with mute) and adjustable microphone pre-amplifier make audio interfacing easy while the 2 line by 16 character backlit LCD gives visual feedback and information.

Selcall, Selcal, Telcall, Telcal, Decoder, Display Click here for the SC33 Manual


Brief Specifications:

Transmit Selcall types: Transmit Selcall types: Selcall, Telcall, Beacon, Hang up, GPS request, GPS location, GPS emergency call, Emergency Selcall
Receive Selcall types: Selcall, Telcall, Beacon, GPS request, GPS location, GPS emergency call, Emergency Selcall
Channel control: Binary (64 channels), 2 x BCD (40 channels), Strobed (100 channels) Normal and inverted control logic programmable
Audio output power: 1 watt into 8 ohms with mute circuit
Microphone input: 8 pin circular connector - pins can be re-assigned
Information display: LCD 2 line x 16 character, backlit
Interface connectors: 15 way D connector for radio interface (audio, power and control)
9 way D connector for GPS interface (RS232 or TTL levels)
8 pin microphone connector, 3.5mm mono jack for loudspeaker
Dimensions: 180mm wide x 85mm high x 65mm deep - not including cradle
195mm wide x 105mm high x 65mm deep - including cradle
Jenal Communications design and manufacture a wide range of radio related devices including units which use the standard HF selcall and telcall signalling as used by Barrett, Codan, Icom and Q-Mac. Thousands of these products are being used all around the world by Governments, NGOs, Commercial organisations and Amateur Radio operators. We also manufacture a number of devices which use the common DTMF (or touchtone) signalling system.
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Last modified: 13 January 2025.