[Elecraft] KAT500 antenna port isolation

[Fred Jensen]

Andy,

 From your explanation, it sounds like you've switched the active KAT500 
antenna port to a dummy load on which you're hearing a local 6m 
station.  If that's correct, I don't believe you're looking at port 
isolation, you're just receiving a local guy on your dummy load, which 
wouldn't be at all strange.  What did I misunderstand here?

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 7/7/2018 12:27 PM, hawley, charles j jr wrote:
> 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
>>