At G6M I fitted BP filters between the t/rx and the linear and coax stub filters on the linear outputs. Made things much quieter for the station in the same room using antennas in the same field. Direct harmonics are now only S9 not S9++++ and no phase noise to speak of.
David G3UNA > > From: [EMAIL PROTECTED] > Date: 2008/02/20 Wed AM 10:36:51 GMT > To: Charles Harpole <[EMAIL PROTECTED]> > CC: elecraft@mailman.qth.net > Subject: Re: [Elecraft] other xmitter nearby > > Hi Charles, > > at our contest QTH we have low loss band pass filters between the > transceiver and the PA > <http://www.bavarian-contest-club.de/projects/bandpassfilter/100W-BP.pdf> (in > > German). > > These filters protect the the receivers on other bands, e.g. we have a > multi-band beam and a 40m beam close together on the same tower, and > when transmitting on one of the antennas several watts come back on > the other antenna. Also they cut down the wide band phase noise. > > 4O3A uses filters at the kW level to do the same. When I was in > Montenegro at Ranko's station, he had the prototypes in test and they > worked surprisingly well. > <http://www.yt6a.com/en/hi-power-filters/high-power-band-pass-hf-filters.html>. > > > > desensed nearly to zero > > I do not know if this has been implemented yet, but Wayne was planning > on watching the return power during reception, so that he could > protect the front end of the K3. Maybe this could be part of what you > are observing. > > vy 73 de toby > > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > ----------------------------------------- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
