Ferrite can help in the case of common mode interference problems. I am using several turns of USB cable wound in double E-core ferrite (Grade N27) at BOTH ends of the cable. <http://kotisivu.dnainternet.net/ahti/sdr-1000/USBfilt.jpg> If you have no E-core, you may use big toroids with several (3-4) turns.
The best solution, of course, would be proper groundings and routing of the cables, but that is usually more easily said than done. 73 Ahti OH2RZ On 16/10/06, Scott <[EMAIL PROTECTED]> wrote: > > If I key the rig with the mouse I have no issue. > > But if I key the rig with my footswitch it keys and unkeys the amp. I > have put ferrit cores on both the footswitch and the amp circuit but > doesn't seem to help. > > But I key with the mouse it all works fine. So the RF seems to be > getting back into the SDR. > > > On Sun, 2006-10-15 at 20:48 -0400, Scott wrote: > > Funny you sent this today. I had this happen to me on 40m and 75m > > today. Only when I am running my CLipperton. This has not happened to > > me before. But I am using a new V1.6.3 and my 160m loop antenna came > > down saturday so had to put it back up and I shortned it about 8 feet. > > So now I may just have RF getting into the USB cable. > > > > Not sure if its related to what your seeing but same thing is going on. > > > > 73's > > Scott > > > > > > > > On Sun, 2006-10-15 at 20:23 -0400, Pete wrote: > > > While experimenting with a multiband wire antenna today, I ran into a > > > problem. On one of the bands the radio reported high swr (I think this > > > was on 10m) when I went into tune mode. > > > > > > PowerSDR then displayed a dialog indicating that the USB connection was > > > no longer functional (can't remember the exact text). > > > > > > I seem to remember there were some problems reported recently where > > > users were having USB disconnect problems but I don't remember them > > > being related to reported high swr. > > > > > > It was necessary to go into setup and check the usb box again in order > > > to get the radio to operate normally. > > > > > > This is the only time I've ever experienced any problems with the usb to > > > parallel connection. Just wondering if this is something others have > > > seen, before I file a bug report. > > > > > > Pete, N3EVL > > > > > > > > > _______________________________________________ > > > FlexRadio mailing list > > > FlexRadio@flex-radio.biz > > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > > FlexRadio Homepage: http://www.flex-radio.com > > > > > > > > > _______________________________________________ > > FlexRadio mailing list > > FlexRadio@flex-radio.biz > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > FlexRadio Homepage: http://www.flex-radio.com > > > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Homepage: http://www.flex-radio.com > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
