David, A very good point. Although the space is rather restricted for RG58/U it should be possible to fit some of the smaller diameter cable such as that used to connect between VHF/UHF PCB's. I have some silver braided coax that would be suitable.
It would have little adverse effect over such a small length, but might provide additional isolation. Food for thought... 73 Stewart G3RXQ On Wed, 16 Jul 2008 12:14:03 -0400, David Robertson wrote: > Stewart, > Your posting is good information however one of the factors of isolation between ANT 1 > and 2 can be how the pigtail leads from the 2 > SO239 connectors and the antenna coupler board are dressed. It would seem easy to have > these nonshielded wires crossing or near each other. The space seems too tight to use > rg58/U cable. this could mean that depending how those wires were dressed the coupling > would be different between all K3's. > > 73 > > Dave KD1NA > > > From: Stewart Baker <[EMAIL PROTECTED]> > Subject: Re: [Elecraft] Re: KAT3 ATU and SPE Expert 1K-FA Amplifier > To: Dave G4AON <[EMAIL PROTECTED]>, <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="ISO-8859-1" > > I made some measurements of the isolation between ANT 1 & ANT 2 on > my K3. > > There is little difference between ATU & BYPASS. Unable to do > 50MHz. > > 1.9MHz 58.1dB > 3.7MHz 51.9dB > 5.1MHz 49.2dB > 7.0MHz 47.1dB > 10MHz 44.7dB > 14MHz 42.5dB > 18MHz 40.8dB > 21MHz 39.2dB > 24MHz 37.1dB > 28MHz 35.7dB > > So on 60m for 100W from ANT 1 there will be 1mW from ANT 2. > > 73 > Stewart G3RXQ _______________________________________________ Elecraft mailing list Post to: [email protected] 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
