[Elecraft] K3/KPA500/KAT500 SWR problem

[Don Wilhelm]

Ray,

Is that 500 volts RMS or 500 volts peak?  Coax, connectors, baluns, 
insulators, etc.  are usually rated for the peak voltage they will 
tolerate without breakdown.

If you calculated that voltage derived from the power and Ohm's Law, you 
would have Volts RMS and you may have something breaking down due to 
excessive voltage (and that create problems like you are seeing).

73,
Don W3FPR

On 12/30/2013 2:44 PM, Walter Underwood wrote:
> UHF connectors are rated for 500V. Maybe you need N connectors, which can handle 1500V.
>
> wunder
> K6WRU
>
> On Dec 30, 2013, at 11:13 AM, Ray Coles <raycoles96 at gmail.com> wrote:
>
>> Forgot to mention that I hauled my MFJ wattmeter/dummy load out to the bush and pushed up 100 watts into it down the feeder with 1:1 SWR, which convinced me that at least my UR8 feeder is OK. Also didn't mention I hooked up my FG01 antenna analyser up at the shack and all seemed normal, but of course the problem only comes over 40 watts (which equates to a pre balun 500V). THE PROBLEM REMAINS and I am still mystified!
>> 73
>>
>> Sent from my iPhone
>> Ray Coles CEng M0XDL
>> 10 Littlemoor Road,
>> Weymouth DT3 6AA
>> United Kingdom
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> --
> Walter Underwood
> wunder at wunderwood.org
>
>
>
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