You can never completely achieve isolation, but as a practical matter Isolation is adequate when feed through of the offending signal is no longer a problem because the circuits involved can handle the magnitude of interference that is present. So the magnitude is subjective. The "buzz" heard is probably a beat between two oscillators an when the magnitude is reduced to the point you are not offended by it it is "gone". Willis 'Cookie' Cooke, TDXS DX Chairman K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart
________________________________ From: Nicklas Johnson <n...@n6ol.us> To: Ralf Wilhelm <r...@super-deutschland.net> Cc: elecraft <elecraft@mailman.qth.net> Sent: Monday, February 10, 2014 10:49 AM Subject: Re: [Elecraft] KX3: nearby noise post-mortem Interesting, and if I may ask a potentially-dumb question, what do we really mean when we use the word "isolation" in this context, and how does it provide the benefit of keeping the buzz out of the detector (or to ask the question in the reverse, how does the buzz get in, in the absence of additional isolation)? Nick On 10 February 2014 08:40, Ralf Wilhelm <r...@super-deutschland.net> wrote: > Hi Nick, > > Turning on the preamp increases the isolation between the local oscillator > and the antenna port. I also wasn't sure if my "buzz" went away when I > turned on the preamp (I couldn't hear it any more) but I used the spectral > display of the MixW-Software and the microphone of my laptop to check and I > found it didn't go completely away (was still visible in the waterfall) but > got much weaker... > > -- *N6OL* Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting. ______________________________________________________________ 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
