Hi Bill, Its much more likely they had wide band TX phase noise that was causing your problems. (Unless they were running K3s :-) There is not much on the receive side that you can do to eliminate that.
Eric elecraft.com _..._ On Jun 27, 2013, at 3:37 AM, Bill Frantz <fra...@pwpconsult.com> wrote: > The West Valley Amateur Radio Association field day operation was set up as > it has been for the last few years on Mora Hill. Mora Hill is at an altitude > of about 500' on the west side of the Santa Clara Valley, California. This > year we were 9A SCV. We had 4 towers with various Uda-Yagi antennas for 20M, > 15M, and 10M with wire antennas for 40M and 80M. > > On HF we were an all K3 operation and for the second year in a row > experienced no mutual interference between our transmitters. We did set up > our antennas in a line, all pointed at the east coast, so the side lobe > rejection helped reduce interference. I was operating the digital station for > most of the event and the only indication I had of other stations in our > operation was a strong track on the P3 from our CW operation. > > I did get significant interference from another field day operation. They > were set up perhaps 1/4 mile away in the major lobe of our antennas using 100 > watts. When I turned the RF gain down low enough to prevent overload from > their signal it looked like a clean PSK signal, so I think the wide-band > interference was being generated in my receive chain. However, with the gain > that low, I couldn't receive anyone else. :-) > > The K3 I was using has 250Hz 8 pole and 2.1KHz 8 pole filters in addition to > the 2.7 and FM filters. I could get the interfering station out of the > passband on the 250 filter quite easily, but there was still a wide band of > noise covering the entire 2KHz band of the computer waterfall. Using the > notch filter didn't eliminate the noise. > > In the end we had 139 digital QSOs in the log and many more CW and SSB ones. > We all ended up tired and happy which means we had a good field day. > > Does anyone have any ideas about how to improve reception under these > conditions? > > Cheers - Bill, AE6JV > > --------------------------------------------------------------------------- > Bill Frantz |"Web security is like medicine - trying to do good for > 408-356-8506 |an evolved body of kludges" - Mark Miller > www.pwpconsult.com | > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
