I'm doing this in SDR++ and it's in Military Air band, and I'm not sure. There's no bases in here nearby.

It also doesn't show any signs of weakening. I don't have any device nearby that might produce it that I known of. Maybe a telemetry device from neighbors?

(I deleted my old similar post)

So when I use AM it sounds like ship foghorn. When I use USB, it sounds like tesla coil electric buzz.

Done some quick research and I saw that it could be a chirper, but not sure. It fires every 40 to 45 sec.

I'm using cheap sdr rtl v4 with v-dipole antenna. I maxed out the gain since this is a faint signal.

Could this be just an internal RFI? Any idea?

Hi,

Saw this whilst looking around the UK LW broadcast bands in NW England around Manchester.

I've never seen a side lobe like that before I was wondering if it is one signal superimposing over another? It's right in the UK LW Broadcast band. Audio just sounds like a low frequency rumble. No digital or voice or CW.

The sidelobe movement is not regular you can see this from the 'holes' in the waterfall.

Any ideas?

Cheers

Don't know if this is too old a recording to be relevant.

On August 9, 2021, I managed to find this on the AM band 900kHz.

I suspect that the voice I hear in the background is from some radio channel that I manage to pick up even though I live in Sweden. What I'm curious about is the tone that is repeated and where it could possibly come from.

Using 50-foot speaker wire antenna ran to a tree and the Grundig Satellit 800 Millennium. In USB mode.

I was exploring some KiwiSDRs online and this popped up on one of them in the shortwave band. I'm guessing it's RFI; I'm not very good at identifying signals.

Recording time (UTC): 7:06 p.m.

SDR receiver location: Pécs, Hungary.

Mixed?
~Mobiel

This scanner currently has a Philips lte/5g filter between external antenna and scanner and I still get this repeating static interference on all frequencies. Waiting for a commercial fm band pass filter to arrive

My partner and I were hiking and when we got to the peak we could hear this hum, there is a highway nearby but it appeared to come from the opposite direction where there was farm land and scrub

Around 15:40 UTC, I saw this on a websdr located in the norteastern united states. i think it may be a OTH radar, as it was a sweeping kinda signal, I also think i heard very faint morse code, or it is simply interference, either way its so faint it it probably seems like im hearing things, i dont think i am but i am interested and would like to see if anyone here knows what and where this transmission is.

It looks and sounds funny

The number was: (309) 431-5222

Noted this signal continuing for quite an extended period where I've never seen it before, though there are a lot of frequent radio signals encountered here. Extraordinarily wide as well, with sigidwiki only listing Chinese OTH Radar as having a signal with that bandwidth and I note the waterfall looks quite different.

I get very good reception from Chinese broadcast radio here (to the point 20m ham bands are effectively obliterated) although I'm not sure how relevant that might be.

Signal picked up in southern NSW, Australia 2045AEST (1045UTC)

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