[Elecraft] KAT500 antenna port isolation

[hawley, charles j jr]

If you have ever disassembled an alpha delta, you can see what it takes for an attempt at isolation.

Chuck Jack 
KE9UW

Sent from my iPhone, cjack 

> On Jul 7, 2018, at 2:13 PM, ANDY DURBIN <a.durbin at msn.com> wrote:
> 
> I've been using Alpha Delta model Delta-4 switches for manual antenna selection.  I thought that having the ability to auto select the appropriate antenna with my KAT500 would be a significant improvement for my station.  I don't have a K3 so I created a band decoder that drives the KAT500 band inputs and now have automatic antenna switching.  However, I'm unimpressed by the isolation between antenna ports.  
> 
> With the KAT500 switched to the dummy load I'm still decoding a local FT8 station on 6 m.  The difference in the FT8 signal between dummy load and antenna is about 19 dB.   I have not found a specification for KAT500 port isolation.  Is what I'm seeing typical?
> 
> Thanks and 73,
> Andy k3wyc
> 
> 
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