[Elecraft] KPA1500 hum - problem solved

[Bob McGraw K4TAX]

If it worked correctly before then why would one need to add a choke?  

Check connections, feed line, matching unit, and radial ground system at the antenna. 

Bob, K4TAX


Sent from my iPhone

> On Apr 5, 2020, at 4:52 PM, Buck <radiok4ia at gmail.com> wrote:
> 
> I would bet your coax shield is acting like a radial and bringing RF back into the shack.  Need a choke.
> 
> 
> k4ia, Buck
> K3s# 11497
> Honor Roll  8B DXCC
> EasyWayHamBooks.com
> 
>> On 4/5/2020 5:33 PM, Carl Yaffey wrote:
>> No hum using a dummy load.
>> No hum using a dipole.
>> Hum only with my all band vertical.
>> Thanks for the suggestions.
>> 73
>> K8NU
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