[Elecraft] KPA500 finals blown

[Fred Jensen]

Well ... it says that, in any 15 minute interval, you can be key-down 
continuously for 10 minutes followed by key-up for 5 minutes which looks 
like a 0.66 duty cycle on my slide rule.  Presumably, this could be 
followed by another such sequence.

Is 10 min down/5 min up repeatedly the same as 40 sec down/20 sec up 
repeatedly?  Intuitively, it seems to me that the PA-heatsink will come 
to some equilibrium temp and a 10m D/5m U duty cycle may not yield the 
same final temp as a 60s D/20s U duty cycle.  Then again, I struggled 
through Thermodynamics.

I know the original KPA500 field testers were encouraged to run the amp 
at "full bars."

73,

Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org

On 1/21/2016 7:53 AM, Phil Wheeler wrote:
> This in the specs in the KPA500 manual "Duty Cycle at 500 Watts 10
> minutes key down / 5 minutes standby" seems pretty definitive for normal
> operations, even RTTY, Earl.
>
> 73, Phil W7OX