Re: K3 ANT 1-2 isolation

Posted by Guy, K2AV on Apr 26, 2012; 9:15pm
URL: http://elecraft.85.s1.nabble.com/K3-ANT-1-2-isolation-tp7500652p7504349.html

I have much greater separations than 30 dB when the jacks are terminated
with real lines, so I'll have to assume that readings like 30 dB are
listening in an unterminated port with signals on another.  You can't
measure separation (or RX noise) without line terminations (resistor or
real antenna) on ALL ports.

73, Guy.

On Thu, Apr 26, 2012 at 3:17 PM, Matt Zilmer <[hidden email]> wrote:

> Might be considered poor in relation to coaxial switches.  Some of
> these get > 70 dB isolation.
>
> 73,
> matt W6NIA
>
> On Thu, 26 Apr 2012 15:44:39 -0300, you wrote:
>
> >Poor is a bit harsh, what do you expect from a single small C/O relay.
> >Anything over 30dB isolation is a luxury.
> >
> >Regards,
> >
> >Mike VP8NO
> >
> >On 26/04/2012 11:24, Ignacy wrote:
> >> True that the isolation between ATN1, ANT2 and RX Ant are poor. The
> solution
> >> is to use a preamp in receive antennas so that signals from RX and TX
> >> antennas are similar in strength.
> >> Ignacy
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