So, could we use the good old methods of wrapping the coax around a suitable toroid. That would mean a longer cable at which point I would invest in a better quality cable if I were doing it and I'm tempted to do so to get the best chance of cracking the main issues we are addressing.
David G3UNA ---- Geoffrey Mackenzie-Kennedy <gm4...@btinternet.com> wrote: > David, > > Double shielded coax would certainly reduce leakage from the coax, and is a > good investment in my opinion. However its use might not have too much > impact on the receiver's birdie problem, because many of the "rogue" signals > involved are probably flowing on the outside of the coax's braid, certainly > if the coax emerges from some enclosure through a hole. > > The usual cause of a receiver birdie is that some response of the receiver > is "hearing" some oscillator or a harmonic, or some mixing product of two or > more oscillators, contained within the receiver. In a down conversion HF > receiver, the great majority of the receiver's responses, therefore the > "rogue signals", that cause birdie problems are at HF and up to low/ mid > VHF, which means that choking off coax runs within a receiver becomes > cumbersome. > > 73, > > Geoff > GM4ESD > > David Cutter wrote on Wednesday, March 04, 2009, at 10:32 AM: > > >I also wonder if it would be worthwhile buying higher spec coax. Don't > >know what is used in the K3, but for the lengths involved it would be worth > >the investment to get short cables made in say LMR100 or RG142 etc if it's > >not already > > > > David > > G3UNA > > > ______________________________________________________________ > 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
