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Aircraft SELCAL Decoder / Logger


ComTekk AvCall makes use of the computer sound card and software DSP (Digital Signal Processing) techniques to decode and instantly display aviation SELCAL codes, a 2+2 tone signaling system used to "page" aircraft via HF (or VHF) radio on overseas flights.

Simply connect receiver's speaker output to computer's LINE or MIC input.

ComTekk AvCall will listen for any SELCAL tone signal and display the code and aircraft information if available. Audio recording may be triggered by tone activation. Received codes can be logged for later review, including date, time, aircraft registration, and audio recording.


Standard Features:

For detailed operating instructions, see Using AvCall.


Serial/USB control for external relay or receiver mode change. In HF communications, SELCAL is typcially transmitted on AM mode, but voice comms take place on USB (Upper Sideband). Some transceivers have an input for switching modes which may be controlled by AvCall.


15-day free trial!

Download trial version

Read on for complete description...OR see the online User Manual.

For ordering information, click here.




Additional Resources:


ComTekk SELCAL Encoder

SELCAL Frequencies

Hear some recorded SELCAL transmissions

HF SELCAL Receivers

Online SELCAL database





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All prices in US Dollars (USD)  

ComTekk AvCall

SELCAL decoder software (Free 15-day trial)

No recurring fees

only $39.95

Accessories & Options

Hardcopy (CD)

Get a Permanent backup: ComTekk Software and activation key burned onto a CD - includes 1st Class Postage to any US address.

US $14.99

Sound Card Isolator/Protector

Protect your computer with ComTekk's exclusive 600-ohm isolator with DC blocking, "hot chassis" and surge protection. Eliminates ground loops, filters RFI and AC line noise!

Recommended when connecting to base station equipment or twisted-pair lines.

(S&H added USA ONLY)

From $17.95




1. Be sure to check the system requirements before placing your order. By purchasing or installing this software, you agree to the terms and conditions set forth in the License (EULA).

2. Your temporary activation key will be delivered via the email address you provided immediately after purchase. Please check your spam filter and allow up to 24 hours before contacting Support.



**Minimum System Requirements:

Microsoft Windows 7/8/10 / Vista™/ XP / 2000
Pentium class or better CPU
16-bit audio device





Uniden Scanner


Receivers capable of monitoring HF SELCAL :

Most of these base or handheld "general-coverage" communications receivers are able to monitor over-the-horizon air traffic control on the HF (High Frequency) band. See the resources section above for some common frequencies to monitor.





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