Dan, I would love to see your recorded noise signatures if possible. Have you posted them or could you send me examples of what you are seeing? If you would like to discuss them, I will be happy to give you a call. I am always seeing a variety of noises and would like to scan raw streams and flag them in some automated fashion as a learning, diagnostic and debugging tool. Vy 73, Gordon Beattie, W2TTT W2TTT@AT&T.NET 201.314.6964
Sent from my Motorola ATRIX™ 4G on AT&T -----Original message----- From: K0DAN <k0...@comcast.net> To: Mark Lunday <wd4...@triad.rr.com>, flexradio@flex-radio.biz Sent: 2012 Jan, Fri, 27 20:40:39 GMT+00:00 Subject: Re: [Flexradio] weird noise source popping up Mark: Over the past few months I have been logging and tracking power line noise, which turns out to be a composite of power line noise PLUS a variety of local noise sources... I have seen some "noise humps" across the baseband (these come and go), also have seen a few different wave forms travel up and down the band(s). I think some of this is spread spectrum, some is computer or power supply EMI, and others remain mysterious. Your noise floor is probably dropping on the Inv-L because it is less efficient and is not picking up the high-freq signals as well as your hex beam. You may wish to keep track of date/time, temperature, humidity, and other factors...see if there is any pattern to when the noise appears. Also, if you have rain, does the offending signal change? If you can make a WAV or WMV file of your noise, I can compare it to signatures I have been logging here. GL es 73 dan k0dan -----Original Message----- From: Mark Lunday Sent: January 27, 2012 01:15 PM To: flexradio@flex-radio.biz Subject: [Flexradio] weird noise source popping up Looks like a square waveform but the top level appears like a shallow "w" with three distinct peaks and two valleys Reoccurs ever 130 KHz. Most noticeable on the hex beam at 40 feet when pointed east. 10 meters -130 dBm against a noise floor of 0135 dBm 12 meters -125 dbm against a noise floor of -140 dBm 15 meters -110 dbm against a noise floor of -135 dBm 17 meters -115 dBm against a noise floor of -145 dBm 20 meters -125 dbm against a noise floor of -135 dBm When switching to the inverted L the noise drops almost to the noise floor. Anyone familiar with any type of device that would generate this pattern of noise? Neighbor's house is 200 feet east if hex beam. 200 kV lines running E/W of antenna at a distance of 300 yards. This is fairly recent, in the last week, and I ignored it because I thought it was isolated, but noticed it when trying to work TN2T as I could not copy the DX. Mark Lunday, WD4ELG Greensboro, NC FM06be wd4...@arrl.net http://wd4elg.blogspot.com http://wd4elg.net _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
