[Elecraft] KX3: nearby noise post-mortem

[WILLIS COOKE]

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 <nick at n6ol.us>
To: Ralf Wilhelm <ralf at super-deutschland.net> 
Cc: elecraft <elecraft at 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 <ralf at 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.
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