Interesting sound. I would encourage other hams to chime in to explain some of this stuff simpler or to ask questions after analyze the file.
At first I thought you were the proud owner of interference. I heard many similar noises over the years. This is why I do some fun stuff with these
types of noises.
I ran the file through Hoka code 300-32. I took some interesting screen shots.
Spectrum analysis show just 4 main carriers. i751.photobucket.com...
Still not convinced at that point. Defiantly ruled out many things it's not and shows why you have what you have on waterfall. I'm still thinking
interference at this point.
Looked at the phase plane.
Didn't really look interesting until I adjusted a couple of things. Now you have my attention.
First pic has some aging, not much, but some.
Second pic has no aging, but the phase is rotating. Defiantly not interference or a random noise.
This is a QPSK signal. That's a Quadrature Phase-Shift Keying. In PSK, the constellation points chosen are usually positioned with uniform angular
spacing around a circle. This gives maximum phase-separation between adjacent points and thus the best immunity to corruption. They are positioned on
a circle so that they can all be transmitted with the same energy. PSK will have 2 reference signals, this noise has 4 signals.
They are in a circle so there is no offset such as what you would see in a QAM signal. There is no modulation of the signals. Besides, an 8 or 4 QAM
signal sounds like RTTY which this noise is not even close to.
I haven't played with my radio for quite a while, but guess what. I want to find this signal and run it through another program in real time.
Whether this is HAARP or not doesn't matter. It doesn't sound like the HAARP signals of years past. Frequency is different from they are accustomed
to run on, but they have the ability to broadcast up to 10 Mhz or so.
I'm not so sure this isn't a hybrid modem such as a Rhodes & Scharz. There are literally hundreds of modems for military usage with more coming
online all the time.
You got something but let me do some more digging.