I've heard the signals that have been discussed here today, but that discussion reminded me of something I used to hear often in the early and mid 70's.
It would be heard here in Mississippi as low as 40 or 80 meters during certain times of the year, but mostly on the upper bands as high as 6 meters during the spring and summer. When listening in the ssb or cw modes, the carrier sounded rather rough as it moved through the passband of my receiver. When listening on AM or FM, it appeared to have a low level of modulation which sounded like a tone of around 400 cycles. During a summer job as a dispatcher for my local police department in 1974, I had to monitor 42.38, and 45.10. That's when I made several observations: 1. The modulation was more noticeable on FM than on AM. 2. The closer the sweep came to reaching what I assumed to be the top of its range, the slower it would move. When it reached the highest frequency, it jumped back to the lowest point, and started over. 3. I learned to associate the sweep with pending band openings on 10 and 6 meters. The higher and stronger the signal, the better the E skip opening signals would be. I never learned what it was or where it was, but suspected some type of military radar. Of course, in the early 80's there was the dreaded Russian Woodpecker, which I have also heard on 6 meters. That one wasn't a sweeper; it was "broad band over radio!" Mike Duke, K5XU American Council of Blind Radio Amateurs ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
