[Elecraft] KPA-500 and RTTY

[Joe Hutchens]

My specs:
  250 watts out
  10 watts drive
  64 volts
  8.5 amps
  240 V line
Temp has got up to 52c @ 300 watts.
Haven't seen any warnings, but the fan kicks in more often as expected. 
I'm uneasy running it at 500 watts during a contest.

Joe Hutchens  ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/


On Sun, Sep 30, 2012 at 11:15 AM, Brian Alsop wrote:

> Dwight.
>
> Something is wrong.  Mine at 400-500 watts gets to about 65C during 
> bunches of RTTY CQ's. It probably can go higher. Fan kicks in at 
> expected values. 240v line.
>
> 73 de Brian/K3KO
>
> On 9/30/2012 14:53, DGB wrote:
>> Am running my fairly new kpa-500 in the rtty contest. It is situated 
>> out
>> in the open.
>>
>> it from 220v and during the run it's current runs at 10a and 64-74v. 
>> The
>> temp starts at 35c and as I run it slowly creeps up to 55-57c and 
>> kicks
>> out with the error message of "Pwr In High".
>>
>> I'm only driving this with a K-3 set at about 13w to drive the amp to
>> 350 watts. I wanted to take it easy on the amp and seems from the 
>> specs
>> that it should handle that. The amp. seems to be real sensitive to 
>> the
>> driving power of just a watt difference from the K-3. The power 
>> varies
>> at the amp from 250-350 watts when running and not fiddling with the 
>> K-3
>> power knob. I have the fan set on 1 and didn't make any difference if 
>> I
>> set it to 6, it still would kick out in due time, just slightly 
>> longer.
>> Must mention it does it whether it's into a resonant antenna or a 
>> dummy
>> load. The temps just slowly climb.
>>
>> Anyone have a similar problem, makes it useless for rtty contesting 
>> and
>> running. No problems in CW contests at full bore!
>>
>> 73 Dwight NS9I.
>>
>
>
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