HFU HF Underground

Loggings => HF Mystery Signals => Topic started by: Robot Matrix on April 07, 2025, 0439 UTC

Title: UNID 3795 kHz 0436 UTC 7 APR 2025
Post by: Robot Matrix on April 07, 2025, 0439 UTC

Could be some weird type of digital signal? Any ideas?

(https://i.ibb.co/sdZ5Mtjy/Screenshot-20250406-233408-Brave.jpg) (https://ibb.co/pBSW9n2J)

http://www.sndup.net/8y4nz

Title: Re: UNID 3795 kHz 0436 UTC 7 APR 2025
Post by: tiNG on April 07, 2025, 1313 UTC

There's no digital signal; it sounds like the noise from an old tube TV or monitor. So, it's more QRM than anything else.

Title: Re: UNID 3795 kHz 0436 UTC 7 APR 2025
Post by: Robot Matrix on April 08, 2025, 0416 UTC

The sound did remind me of rfi from the crt days,  but who uses those anymore? Never seen it on this band until now. You really think someone moved into the neighborhood with on old TV? What's odd is it starts and stops. One signal will be strong, then another weak, with a break in between... whereas the old TV rfi was continuous, but varied in strength depending on what was on the screen.

Title: Re: UNID 3795 kHz 0436 UTC 7 APR 2025
Post by: tiNG on April 08, 2025, 0843 UTC

I never said it IS an old tube TV, please read carefully.