HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: PeteZahpai on November 18, 2025, 0502 UTC
-
1. Frequency (kHz) - Between 6780 and 6980 kHz (kept shifting up and down)
2. Time (UTC) - 11-18-2025 @ 0330 UTC
3. Duration - Short single bursts, some followed by a second burst
4. Receiver Mode - USB
5. Receiver Location - NW Alabama
6. Description - I have waterfall images and sound captures, but no idea how to share them here..
7. Radio - SDRPlay/SDRUno w/ upconverter, 24' wire end fed vertical.
.
-
You can try something like this:
[url ]Link To Your Audio / Image file here .com[/url]
Click on the Insert Hyperlink icon when composing a post.
-
I have seen people using Archive.org for HF radio recordings.
There are the usual suspects as well. Of note, SoundCloud or YouTube should suffice for general recordings, like data or utility stations, though music might net your account a copyright warning or strike.
I use imgbb.com for images. Just upload the pic, then you can copy-and-paste the bbcode into your forum post.
-
1. Frequency (kHz) - Between 6780 and 6980 kHz (kept shifting up and down)
2. Time (UTC) - 11-18-2025 @ 0330 UTC
3. Duration - Short single bursts, some followed by a second burst
4. Receiver Mode - USB
5. Receiver Location - NW Alabama
6. Description - I have waterfall images and sound captures, but no idea how to share them here..
7. Radio - SDRPlay/SDRUno w/ upconverter, 24' wire end fed vertical.
.
Without more information, an audio recording, a waterfall screen shot, or better yet, both, you are not going to get an answer that is more than a guess. that frequency range has many possible answers, including radar and various digital modems.
T!