Digital mil air comms in the NTTR

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Message posted by Joerg (Webmaster) (Member since 10/17/2000) on October 10, 2023 at 14:03:21 PST:

I was finally able to capture Raw IQ data for some digital transmissions on mil air frequencies. I first heard the digital transmissions in August of this year, during Red Flag 23-3.

The digital channels are referred to as "secure ..." (e.g. "secure 18 aux"). The attached sample is NOT an audio file. To play and analyze it you will need "SDR Console V3" from

The sample was originally recorded with SDRSharp and edited to the time frame and frequency range of interest with SDR Console. The center frequency is 253.200 MHz, and the signal has a bandwidth of at least 30kHz. Comments?

Attached link: Digital transmission on 253.200 MHz (not an audio file!)


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