[Elecraft] Upper limits of KPA500?

[Jack Brindle]

Dave;

The KPA500 will protect itself above 90C, but it will work quite well at 70C. Why do you stop at 70C?

73!
Jack, W6FB


> On May 3, 2020, at 1:26 PM, Dave Cole <dave at nk7z.net> wrote:
> 
> Hello,
> 
> I just got the new MMSSTV software, and will be running a bit of SSTV. SSTV is 100% duty cycle.
> 
> Initial testing here indicates no power level is safe...  At 150 watts the KPA500 reaches 70C pretty fast, in under two minutes, and 70C is my upper limit for testing...  At 500 watts it reaches 70C in about the same time...
> 
> Can I assume the amp is not the most efficient thing in the world at 200 watts?
> 
> If the KPA500 can't deal with 100% duty cycle, for two minutes, how does the K3 deal with 100 watts for two minutes, at 100% duty cycle?
> 
> -- 
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist
> ARRL Asst. Director, NW Division, Technical Resources
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