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Definition: Selcall
Definition: Telcall

SC2 Selcall/Telcall Microphone

Available again for a limited time only



HF Radio Selcall Telcall Selcal Telcal Microphone Convenient and Easy to Install - Plugs into Radio's Microphone Connector
HF Radio Selcall Telcall Selcal Telcal Microphone Upgrades Existing HF-SSB Radios to provide High Reliability Digital Selcall and Telcall capability.
HF Radio Selcall Telcall Selcal Telcal Microphone Economical and Reliable
HF Radio Selcall Telcall Selcal Telcal Microphone Interoperable with Australian Standard Formats (based on CCIR 493-4) as is used by Barrett, Codan, Icom, Q-Mac, and SGC (Note: WA2 format is no longer supported).
HF Radio Selcall Telcall Selcal Telcal Microphone Convenient Operator Interface

HF Radio Selcall Telcall Selcal Telcal Microphone

The SC1001 HF Selective Calling Module successfully pioneered the market for a field retrofitable module to upgrade existing HF radios to provide advanced selective calling capabilities. Jenal Communications is pleased to offer the latest developments in the HF Selective Calling microphone family the SC2. Now upgrading and field retrofitting HF radios is easier than ever!

The SC2 Selcall/Telcall Microphone is a convenient handheld unit with all HF encoding and decoding circuitry built in! It can be easily attached to the microphone connector of virtually any brand of HF-SSB radio. When plugged into the radio, the SC2 adds a full range of high reliability selective calling capabilities. The SC2 utilizes the popular Australian Selcall/Telcall signalling formats. These field proven digital formats, based on CCIR recommendation 493-4, provide economical and reliable selective calling, optimized to the vagaries of HF-SSB communications. The SC2 is fully compatible with existing radios and networks utilizing our earlier SC1001 modules as well as those with Codan and Barrett selective calling and telephone dialing systems.

Convenient control and programming is provided by the keypad on both the SC2. The keypad enables a wide variety of functions such as Selcalls, Telcalls, Beacon Calls, Repeat last Selcall/Telcall, Recall last Caller, Mute/UnMute, Hang-up, and Alarm Reset.

A series of audible tones and alarms through the radio's loudspeaker, or through the microphone's internal Piezo alarm, provides positive operational feedback. Tones are provided to confirm key entry, Selcall Mute/UnMute, and entry error. Distinctive alarms are provided for receipt of Selcalls or Telcalls, including a red LED on the front of the microphone. In the event that a call is not promptly answered, distinctive background alarms beep every five seconds to alert a returning operator that a call (and which type) was received.

The SC2 is simple to connect to a radio. There are a maximum of nine, and a minimum of five possible connections. The minimum connections are: Power, Ground, PTT out, Transmit Audio and Receive Audio. Additional connections are available for: Mute, Scan Control, Audio Alarm and an Alarm Relay Driver. Optimum audio levels can be precisely adjusted by the the internal ten turn potentiometer controls.

All programming of the Selcall Self-ID and operational modes is via the microphone keypad. The SC2 options include programming of format (Codan, Barrett), scan control format, scanning reset timer, beacon mode selection, and transmit or receive disable.

The SC2 is normally supplied with a "pig tailed" cord. On special order it can be supplied prefitted with various standard microphone connectors.

Comparitive Features - SC2 & SC3
(SC3 no longer available)

 Operating Functions



 Transmit Selcall

 Transmit Telcall*


 Selcall Beacon

 Hang-up command (end of call)

 Resend last transmitted call

 Recall last received Selcall

 Recall last received Telcall

 Change between Barrett & Codan formats**


 Selectable Options



 Selcall Beacon receive disable


 xx99 Beacon receive disable


 Transmit disable


 Receive disable


 Latch alarm output

 Horn alarm output

 Audio alarm output

 Piezo alarm output

 Mute/Scan disable

 Mute release during alarm tones

 Scan pulse mode

 Scan stop mode


 Scan auto-reset timer (Off or 1 to 9 minutes)


 Scan auto-reset defeat


 End of transmission tone ("Roger Beep")


* - Both SC2 and SC3 units receive and store Telcalls
** - Function has to be enabled in programming

See the SC2 or SC3 programming manual for more information on functions and options


Operating Power: 6 to 13.8 Vdc nominal, 55 mA maximum, approx 8mA idle
(30 mA with backlight LEDs)
Functions Available:

Mute Open/Close
Send Selcall
Send Telcall (SC2 only)
Repeat Last Selcall/Telcall
Recall Last Caller
Send Hang-Up Command
Reset Alarms
Send Beacon Request
Auto-Scan Reset Timer (SC2 only).

Outputs Available: Called LED
PTT (Active Low)
Scan Stop/Pulse
Transmit Audio and Alarm Audio.
A Relay Driver is available for Latched Alarm or Horn Alarm Output (30V 250 mA max relay coil, active low).

Key Pad Programmable Encode
Codan or Barrett Selcall/Telcall(SC2 only) on Transmit
Auto-select on Receive.

Weight: Approx 220 gms (8 oz) (Shipping weight approx 400 gms / 1 lb)

Click here for radio modification details (SC2 and SC3)

Click here for SC2 & SC3 Programming Manuals

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.
Last modified: 23 June 2015.