Aviation Selective Calling System SELCAL Encoder 3.0 The low cost software-based SELCAL encoder Used by airlines and aeronautical radio operators to 'page' specific aircraft during flight via HF or VHF radio. Quick installation and setup, simple to use. • Up to 64 user-defined Memory Presets • Control any transmitter directly with ComTekk Universal Radio Interface • Operates as a dispatch console with computer headset • PTT (Push-to-Talk) via serial/USB or VOX • Log file keeps record of SELCAL calls sent • Security features keep codes and settings confidential • Built-in calibration system for high accuracy (not required when used with ComTekk Universal Radio Interface). • 15-Day Free Trial Read on for complete description.OR see the. Comment Installer Mcboot Sur Ps2 Slim. How it works: ComTekk SELCAL generates Aviation SELCAL or selective-calling tones using your computer's sound card.

ComTekk's SELCAL system is compatible with virtually any radio when used with the Universal Radio Interface. (Note: EIA tone-remote is not currently supported by ComTekk SELCAL) SELCAL is an international signaling protocol which allows airline radio operators to contact specific aircraft over HF of VHF radio while in flight.

For an older tone decoder design with more parts and less features, see this page. For a software two-tone decoding program that runs on Windows, see this page. CTCSS decoder at the receiver hearing the. HAMTRONICS ® TD -5 SUBAUDIBLE TONE EN CODER/DECODER: ASSEMBLY. Tone Decoder software free downloads and reviews at WinSite. Free Tone Decoder Shareware and Freeware.

The SELCAL decoder on board each aircraft is assigned a unique 4-letter code. This allows the receiver audio to be muted until that code is received, alerting the crew there is a radio call for them. This way, they do not have to be distracted by radio traffic intended for other planes.

ComTekk SELCAL (meets ARINC-714 / ICAO Annex 10 international standard) is a dual-tone (2x2) format similar to DTMF, but uses 16 different tone frequencies. Each digit or letter in the code sequence refers to an audio tone frequency. The first two digits comprise the first tone pair, and the last two digits determine the second pair of tone frequencies. ComTekk SELCAL includes a convenient auto-calibration system which compensates for errors in the sound card's timebase, ensuring accurate tones are produced. Accuracy is critical, as the tone frequencies must be very precise in order to be decoded by the aircraft's electronic decoder. NOTE: For best results, we highly recommend using our Universal Radio Interface, which has a temperature-stabilized quartz oscillator for highly accurate tone encoding.