I was transmitting Digital SSTV on the 40 meter band this morning when I spotted this strange signal in the waterfall. I'm not sure if I was tuned to the proper frequency or not, and I tried both USB and LSB. I suspect that this is likely someone doing a radio test of some kind. Tuned via the Web SDR located in Newport, Oregon, USA.
Video of the signal here.
I've been on the air for about three hours this morning, on 40 meters, and I only noticed the signal pop up about two hours ago. It only transmitted twice, both times for about 5-7 minutes. At first, I thought it was someone else (like me) transmitting waterfall images via digital SSTV.
I've been monitoring this frequency since I recorded the video and it has repeated a few times. In fact, it is transmitting again as I type this.
Any ideas as to what it may be? I'm using this Web SDR if you want to check it out yourself:
http://kiwisdr.smeter.net:8073