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.