[Elecraft] KPA500 Faulting on high SWR on power rise

[Walter Underwood]

In this case, the lightning protection is on the antenna side of the matching unit, so it isn’t at 1:1 SWR or 50 Ohms. At 10:1 VSWR, we would see 500 V peak at 500 W. 

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Feb 24, 2018, at 4:46 PM, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
> 
> Based on the specification of 500 volts peak,    5KW at 50 ohms = 500 volts.  It would seem the PL-259 is adequate for ham radio applications per specification to 0.3 GHZ or 300 MHz without issues. Of course one is dealing with 50 ohms, which implies essentially a 1:1 SWR.
> 
> 73
> 
> Bob, K4TAX
> 
> On 2/24/2018 4:53 PM, john at kk9a.com wrote:
>> Really?  An Amphenol UHF connector only has a 500v rating.
>> 
>> John KK9A
>> 
>> 
>> Bill Johnson k9yeq wrote
>> 
>> 1000v to me could be too low for a 500W amp.  You can for the time being
>> leave the plug out, just disconnect when you are not using your equipment.
>> I use a remote disconnect to remove the antennas at my remote grounding
>> panel.
>> 
>> 73,
>> Bill
>> K9YEQ
>> 
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> 
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