I question the 4:1 balun being the correct nor best choice. Typical of that 
antenna the feed Z of the radiator is more likely 25 to 35 ohms. The 4:1 balun 
is presenting something like 10 ohms to the tuner. Worst case for high current 
and hi loss in the tuner causing heating.   A 1:1 balun would seem more likely 
correct. 

Many seem to "think" a 4:1 balun is correct when using open wire or a balanced 
line to "match the line". 

Bob, K4TAX


Sent from my iPhone

> On Feb 24, 2018, at 8:59 PM, Jim Brown <[email protected]> wrote:
> 
> Someone should tell the electrons. UHF connectors have been standard on legal 
> limit power amps for as long as I've been a ham.
> 
> 73, Jim K9YC
> 
>> On 2/24/2018 1:46 PM, Walter Underwood wrote:
>> The Amphenol voltage rating for UHF connectors is 500 V peak. So the 
>> connectors could be another weak point.
>> 
>> https://www.amphenolrf.com/connectors/uhf.html
> 
> 
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