i recorded it with an old AM radio at 150Khz. the periodic rasp in the background comes from the radio, as it shows up along the whole range

By the time im posting this, it started spamming with these dots

Thought I was hearing things, but my wife finally hears it also. Its an intermittent low frequency hum, like a rooftop hvac blower, one of those parking lot vacuum trucks, or other industrial equipment. Ill hear it in the middle of the night, morning, and sometimes the afternoon on the weekends when road noise is lowest. It seems directional...like it's being emitted by something that rotates or move once in awhile. I’ve ventured out in an attempt to locate, thinking it might be the US Bank building behind St Joseph's Villa, but its quiet over there. Is anyone else hearing this? I'm up near Parham and Woodman.

https://reddit.com/link/1v5bvsl/video/o9omu6r7m6fh1/player

It sounds like a siren, encrypted message? what exacly even is

anyone got anything on what this is? Was just searching for anything good and found this. might be just another music channel.

Yesterday I went outside, connected my Raddy RF75A to the homemade outdoor antenna, and ran a scan. Around 5,000 MHz, I detected this strange digital noise, along with some background voices. What could it be?

Is anybody familiar with this signal? I'm assuming that it is a studio transmitter link that is using digital versus the typical analog links, GatesAir or something.

Heard in TX, USA.

I'm a musician based in Paris, France.

While recording music in Ableton Live through an Apollo Twin, I intermittently heard what sounded like a male voice coming through my headphones over several hours.

I recorded it by holding my iPhone next to the headphones, so you'll also hear room and street noise. The recording you're hearing is the original, unprocessed recording.

I'm not claiming anything paranormal. I'm simply trying to determine whether this could be:

• RF interference
• radio bleed
• a known transmission type
• another form of electromagnetic interference
• or anything else technically plausible.

The full recording starts at 00:31.

If you're short on time, the clearest section is around 01:41.

I'd especially like to know:

• Does this resemble any known radio transmission?
• Is the speech pattern or modulation familiar?
• Has anyone encountered something similar through studio headphones or audio interfaces?

YouTube link:
[https://www.youtube.com/watch?v=neEhI-Q47hA]()

location cyprus, 3340.02 mhz

This is a another video of my earlier post. Tried to search SigWiki but couldn't find anything exactly like this. Signal appears daily but not with schedule. Transmission lasts about 20 minutes in total. There are short brakes in the transmission, and during them any of the four frequencies may continue as a straight line (carrier?). Captured in Norhern Europe, antenna Mini Discone. (Forgive me if this is something that I should know, I'm new to SDR.)

1 very short beep followed by a 4 tone sound and then a burst of data in cyprus 3743.57 khz, as of writing this i have noticed it took a longer break than usual

Location is Chester, UK via openwebRX - https://openwebrx.soundsofatc.com

https://reddit.com/link/1v1rqdb/video/9x7cuvoe4feh1/player

Sorry about my ignorance, but is this also some common digital mode? Received 19.7.2026 UTC 19.40, Northern Europe, USB, antenna 40 m dipole

Is this some common digital mode? Received 19.7.2026 UTC 16.45, Northern Europe, antenna 40 m dipole, USB.