If it was a switch in line to the vertical, I’d think you would observe a SWR 
increase when that antenna was selected. 

Bob, K4TAX


Sent from my iPhone

> On Apr 5, 2020, at 5:12 PM, Carl Yaffey <cyaf...@gmail.com> wrote:
> 
> It turned out to be using the 4-position Alpha-Delta coax switch. No problem 
> until I connect both the vertical and the dipole to it. 
> 
>> On Apr 5, 2020, at 5:37 PM, Buck <radiok...@gmail.com> wrote:
>> 
>> I would bet your coax shield is acting like a radial and bringing RF back 
>> into the shack.  Need a choke.
>> 
> 
> Carl Yaffey  K8NU
> 614 268 6353, Columbus OH
> http://www.carl-yaffey.com
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> 
> 
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