Mike: That is the "signature" of a switching power supply.
Your WiFi router? Other "wall warts" ? Your desktop computer. Any laptop computer power supplies. --- Graham == On Wed, Sep 8, 2010 at 9:40 AM, Mike WA8BXN <hubb...@hotmail.com> wrote: > I have noticed at times (particularly during fox hunts) what I can best > describe as a noise hill that usually drifts around in frequency. For a > width of several KHzon the panadapter I see what is shaped like a "normal > curve" that trails off for many more KHz. In panfall mode I can see a > brightening where the curve in the panadapter display. > > > > Sometimes, when the peak of the curve is in the passband of the receiver I > can hear a shift in the noise frequency at around a second or two intervals > as the peak drifts around. > > > > I have observed this with both a 1000 and 1500 flex radios. Disconnecting > the antenna gives a flat display. Connecting a wire to the antenna several > feet long just in the shack does not show the noise hill, so it doesn't > look > like its something in the shack. > > > > The effect happens with a number of antennas and is not consistent at all. > I > live in a rural area with other houses hundreds of yards away. > > > > Has anyone else observed this sort of thing or have any idea what it might > be? > > > > Thanks in advance! > > > > 73 - Mike WA8BXN > > _______________________________________________ > 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/
