[Elecraft] KX3: nearby noise post-mortem

[Nicklas Johnson]

I think that is very likely to be the case, yes.  It's worth noting that it
is a somewhat badly unbalanced antenna at the moment.  Normally it would
have a set of el-cheapo tape measures attached as radials, but the weather
and time have not been kind to them, so they're not currently attached...
the only ground is the actual earth ground at the base of the antenna.  So
I won't be even a tiny bit surprised to find no shortage of common-mode
problems on the shield.

I think I keep a spare length of coax around here somewhere that can be
readily wound around a coffee can to make a common-mode choke when needed.
 Will be interesting to see if that is enough to clear up the detection
problem, too.

   Nick


On 10 February 2014 10:18, Ralf Wilhelm <ralf at super-deutschland.net> wrote:

> You have written earlier that you could pull the coax plug "half out"
> (disconnecting the shield) and that this also helped. So maybe you have
> common mode current on the coax  which would also increase the coupling to
> the wiring (because not only the antenna itself but also the coax would
> emit the local oscillator). Since this could also  increase the risk of
> r.f.i. when you transmit I would recommend that you add a common mode
> current choke (a few windings of the coax?) close to the rig - and a second
> one near the antenna perhaps...
>
> --
*N6OL*
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