[Elecraft] KAT500 antenna port isolation

[Jim Brown]

Yep.  When you're trying to get 50-60 dB down, EVERYTHING has to be done 
very well. Several years ago, I was not achieving the harmonic 
suppression I thought I should, so I bought a spool of BuryFlex (RG8 
with a robust copper braid shield) and replaced every piece of coax 
inside my shack. I didn't measure the result (not easy to do), but 
suppression was 10-15 dB better.  Another important component of 
minimizing crosstalk is having a good ferrite choke at the feedpoint of 
every antenna.

73, Jim K9YC

On 7/9/2018 8:19 PM, Bob McGraw K4TAX wrote:
> All this doesn't speak well for the quality of the dummy load or coax jumpers.
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
>> On Jul 9, 2018, at 10:01 PM, Phil Kane<k2asp at kanafi.org>  wrote:
>>
>>> On 7/9/2018 7:12 PM, K8TE wrote:
>>>
>>> BTW, I have made a 75m QSO on a dummy load.  I think I was using Radio Shack
>>> coax back then (in the 1970's when I worked for the company).
>> When I lived about three miles away from Mt. San Bruno south of San
>> Francisco, I routinely worked all of the VHF and UHF repeaters there
>> using a dummy load!  Amazing what a clear eye-ball path can do.