Ahhhh, the double edge sword of the Panadapter. It is the best and worst thing about PowerSDR.
No need to repeat the accolades of the Panadapter, they are well know to all. The cutting side of the sword is that most people never had a really sensitive RF spectrum analyzer masquerading as a HF transceiver before, go you never really could "see" all the RF garbage inundating your operating position. One thing to remember is that because you can now see it, doesn't necessarily mean it is a bad thing. Look at the actual strength of the signals in question. Something that is -100 dB in strength isn't really something to lose a lot of sleep over. I will admit the mystery signals are a lot of fun to observe. In an upcoming release of the software, if you have an FLEX-5000+RX2 and two diverse antennas, you will be able to null those "old friend" signals using a diversity reception technique that subtracts the phase and gain of the offending signal in the RX passband. -Tim -----Original Message----- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of John Ragle Sent: Thursday, October 01, 2009 10:23 AM To: Jim; flexradio@flex-radio.biz Subject: [Flexradio] ...odd signals... Jim... I live out in the countryside on a dead-end road (in the middle of a corn field) with 12 houses on it. My panadapter screens on almost every band are filled with spurious signals that go away when I remove the antenna (or connect to a 50-ohm dummy load). I have tried turning off my WiFi router (no relief), my wife's computers (no relief), disconnecting my cable modem (no relief). Similar spurs show up on my non-digital 2 meter rig (IC-910) with all the household computers and the modem off, and those also go away when I disconnect its antenna. The most common of these spurs is a cluster of 3 narrow signals spaced by 1 or 2 kHz and occurring every 90-95 kHz or so. They do not appear to be a carrier and sidebands. Some of the spurs wander slowly across the spectrum at a rate of a few kHz an hour. My cable service and all my other services are /*underground*/ up to the house. I have not tried shutting down the power to the house (awkward), but conclude these are real signals emanating from the neighborhood. The nearest above-ground power, phone, and cable lines are at least 500 feet from the house. Many of my close neighbors run computers of unknown vintage. My choice is either to hire out a "fox hunter" or ignore the spurs. By now, the spurs are "old friends." John Ragle -- W1ZI _______________________________________________ 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.flex-radio.com/ Homepage: http://www.flex-radio.com/ Message delivered to telli...@itsco.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.flex-radio.com/ Homepage: http://www.flex-radio.com/ Message delivered to arch...@mail-archive.com
