[Elecraft] PA set up issues

[Don Wilhelm]

Andy,

As Roger suggested, check your power supply - I did not initially 
realize that the K3 "trips off", I had previously thought that it had 
reached some maximum power that it would not go above.  Check the power 
cable connections to be certain they are tight both inside and outside 
the power supply enclosure.
If that is not the problem --
Measure the current drawn just below just below the point where the K3 
trips off and include that information in an email to K3support at elecraft.com

73,
Don W3FPR

Roger D Johnson wrote:
> GD0TEP wrote:
>   
>> Hi Don,
>>
>> Thanks for the info, I downloaded the program and carried out the
>> calibration procedure, and yes, it was interesting to watch but didn't cure
>> the problem.
>>
>> Here's the results I get, the power indicated is taken from the KW. I start
>> out at 50w, then increase the power heading towards 100w:
>>
>> 160m - 97w & radio trips, next test found fine adjustment of front control
>> made the 100w
>> 80m - 100w Appears OK
>> 40m - 100w Appears OK
>> 30m - 100w Appears OK
>> 20m - radio tripped off, next test found that all I could get is 85w before
>> it would trip again.
>> 17m - 94w & radio trips off, repeated attempts results in the radio tripping
>> off @ 85w
>> 15m - 95w & radio trips off, repeated attempts results in the radio tripping
>> off @ 94w
>> 12m - 90w & radio trips off, repeated attempts results in the radio tripping
>> off @ 88w
>> 10m - 100w
>> 6m - 94w & radio trips off, repeated attempts results in the radio tripping
>> off @ 86w
>>
>> So, now what should I try??
>>
>> 73,
>> Andy
>> http://gd0tep.com
>>
>>   
>>
>>     
> Hi Andy....
>
> I had the same problem originally. It was the power supply current 
> limiting! Supposedly,
> a 25 amp supply, it would start limiting at about 18-20 amps. This 
> dropped the voltage
> which would cause the radio to shut itself off.
>
> 73, Roger
>
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