Ten kilometers!  Wow, that’s DX!

I know that you meant 10,000 miles, but to the global readership most ops will 
read it as “10 km“ first.

73,

Kevin

Sent from my iPhone

> On Nov 10, 2023, at 11:15, Victor Rosenthal <k2vco....@gmail.com> wrote:
> 
> I don't have a kpa1500, but I recall someone from Elecraft saying that
> since the efficiency decreases when power is reduced, backing off the power
> does not reduce the heat load.
> 
> Victor 4X6GP
> 
>> On Fri, Nov 10, 2023, 16:28 Pete Smith N4ZR <pete.n...@gmail.com> wrote:
>> 
>> I started operating FT8 while my KPA-1500amp was out for repair.  Now
>> it's back and raising a question:
>> 
>> Operating with just my K-3, set at 100 watts, I would see 100 watts
>> indicated on its meter through the whole 15-second FT8 transmission..
>> When I drive my amp, it only needs 30 watts for full CW power (on 24
>> MHz),  but the amp indicates 1200 watts input for the whole FT8 transmit
>> cycle.  I'm wondering if I should back off to protect the
>> amp,considering the duty cycle is so high - on the other hand, the
>> temperature reading profile of the amp seems to be pretty much the same
>> as on CW.
>> 
>> 73, Pete N4ZR
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