Many of you have been asking about the “Mystery” signal. Fear not, as it is alive and well and can be heard every night around midnight ET. You can find it lurking between 4700-4800 kHz. Here it is invading the frequency of a navigational beacon. I was using my SDR PLAY and SDR CONSOLE software with my OCF dipole.
Captured the tail end of a MARS training net on 6823 KHz. This was heard with my SDR PLAY RSP and SDR console software V3
AIR in poor band conditions. This was recorded using SAM mode on my ELAD FDM S2.
Using some new software for this recording. This is called SDR Sharper and it’s pretty nice. Lots of good features and easy to use. This is the Voice of Vietnam, using my SDR PLAY.
Captured this using my new SDR PLAY SDR and SDR console software. Very impressed with this low cost SDR. Will have more updates with it soon.
This one sounds familiar, however, I do not recall the signal being so wide in bandwidth and lasting this long. Another data transmission from an unknown source. this is a short clip of it on 13605 KHz.
Been hearing a lot of this over the last several months. Thought initially it was a stuck WEFAX transmission,. however this has been ongoing for too long for it to be that. Some type of data transmission.
Here’s another capture of the “Mystery Signal” This time it seemed to bottom out here on 4805Khz, but was ready to begin climbing in frequency, see the other video. This season the sound of it has definitely changed. It sounds distorted or compressed from last season. Still a mystery as to the origin and purpose of this signal, however its fairly certain this is a controlled transmission, as its start time is always around 0500UTC and can be found within this band.
I haven’t mentioned the “Mystery Signal” in quite sometime. I heard it back in September of 2015, but only briefly. After reading a report about it on Facebook, I managed to capture it down in the 4.814 khz range. It’s behavior is similar to what I’ve experienced last year, however it does sound different. Distorted perhaps. It still has no regard for any other signal in its path. Here it moves across a STANAG signal on its way up in frequency.
You can always hear at least some amateurs on 75 or 80m using AM mode. They have great audio.