I have experienced the same thing; but have no factual knowledge of the cause. I have always suspected that some of it may be caused by folks testing their antenna for the low SWR frequency by sweeping the band while transmitting carrier and watching for a minimum reading. I hope I am wrong.
73, John -----Original Message----- From: Bernie Doran <[email protected]> To: Discussion of AM Radio in the Amateur Service <[email protected]> Sent: Thu, Jan 21, 2010 8:11 am Subject: [AMRadio] frequency sweeper I acquired a SDR radio and have been playing with it for about a mo. It eems very strange tuning with a mouse, but works great as a panadapter icking up the IF. I have noticed for some time that there are signals unning up the amateur bands, always assume some fool just changing requency, however snooping around, I found that the same signals original utside of the amateur bands and sweep those areas also. it/they appear to e unmodulated and as a wild guess appear to move about 75 to 100 KC per econd. My first guess is that they are some sort of propagation testing canner. does anyone know what these are and who does it, power? antennas? ocation? etc? Or perhaps it is the gov't controlers sending some sort of signal to the DBs stations with the new information to impress on us!!. ever wonder why he NDB stations are located in high population areas? _____________________________________________________________ ur Main Website: http://www.amfone.net MRadio mailing list earchable Archives: http://www.mail-archive.com/[email protected]/ ist Rules (must read!): http://w5ami.net/amradiofaq.html ist Home: http://mailman.qth.net/mailman/listinfo/amradio ost: [email protected] o unsubscribe, send an email to [email protected] with he word unsubscribe in the message body. This list hosted by: http://www.qsl.net lease help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ 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
