[Phillip Beall]

All,

There was an X (formerly Twitter) post made NC Scout “Sounds like jamming on USAF Global HF net. 11.175mhz is experiencing interference, 8.992 is not.  Audio sounds similar to Russian CIS family of digital modes.  Not confirmation.”  It included a short looped video clip of this image:

7:30 PM · Mar 10, 2026 · 15.4K Views

The linked clip can be listened to at the X link here.  When I asked Grok to give me some insight into NC Scout and his post I got the following:

The author/poster is “NC Scout”, who goes by the handle “@Brushbeater” on X (formerly Twitter). He’s a U.S. Army veteran (former Infantry Scout in a reconnaissance unit, NCO, with deployments to Iraq and Afghanistan). He runs “Brushbeater Training and Consulting” (brushbeater.org), where he focuses on small-unit tactics, survival/preparedness skills, off-grid communications, amateur radio (ham), and related topics like signals intelligence (SIGINT/COMINT). He’s the author of the book ‘The Guerrilla’s Guide to the Baofeng Radio’ (a bestseller in prepper/ham circles) and sells related gear/training through his site. His content often appeals to preppers, libertarians, veterans, and those interested in austere-environment comms or guerrilla-style operations.

Regarding the specific post (https://x.com/brushbeater/status/2031528035376153010), it’s a short analysis of what appears to be interference on the USAF Global HF (High Frequency) net:

• He identifies “11.175 MHz” as affected by interference/jamming, while “8.992 MHz” (another USAF Global net frequency) is clear.
• The audio interference “sounds similar to Russian CIS family of digital modes” (CIS referring to Commonwealth of Independent States, i.e., post-Soviet/Russian signals).
• He caveats it as “not confirmation” — just an observation.
• In a follow-up reply in the thread, he links to “sigidwiki.com/wiki/HF” (the Signal Identification Wiki for HF signals) as a tool for identifying unknown intercepts.
• “Is his analysis any good?” Yes, it’s reasonable and grounded for what it is — a quick, informal field observation from someone experienced in radio monitoring and SIGINT.
• USAF Global HF nets (like the High Frequency Global Communications System, or HFGCS) do use frequencies including “11.175 MHz” and “8.992 MHz” for worldwide command/control voice traffic (often USB mode, with “ANDREWS” or other callsigns).
• Jamming or intentional interference on military HF nets isn’t unheard of, especially from state actors (Russia has a history of HF jamming/digital noise on various bands, including against NATO/military comms in exercises or conflicts).
• The “CIS family of digital modes” reference aligns with known Russian signals (e.g., FSK/PSK variants or wider digital noise used for jamming or testing), which often appear as harsh buzzing, pulsing, or wideband interference on audio.
• His screenshot shows a receiver (likely something like a Xiegu G90 or similar portable HF rig) tuned to ~11.175 MHz in LSB/USB, with a waterfall/spectrum display showing a strong, wide signal spike in the audio range — consistent with broadband digital interference or jamming overpowering the net.

It’s not a deep forensic analysis (no direction finding, no detailed waveform capture, no confirmation of source), but he doesn’t claim it is — he explicitly says “not confirmation.” For a rapid share from a knowledgeable radio operator/former military guy with SIGINT experience, it’s solid: accurate freqs, plausible attribution based on sound/signature, and points to a good resource (SigidWiki) for others to verify. Others in the thread report hearing similar things from different locations (e.g., Chattanooga), adding some corroboration.

If you’re into ham radio, SIGINT, or monitoring military HF, his take is credible and useful — not wild speculation.

Kathy and I own NC Scout’s book (The Guerrilla’s Guide to the Baofeng Radio ($19.99)) and we gave away a copy to the Club a year or two ago.  We find his writing informative, if not insightful, and very interesting.  We suggest that you follow him on X (formerly Twitter) and check out his book.

73

Phillip Beall (W5EBC)

• This topic was modified 4 months ago by Phillip Beall. Reason: Corrected listed to listened
• This topic was modified 4 months ago by Phillip Beall. Reason: Cleaned up a couple of ** where " were supposed to be

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