http://elecraft.85.s1.nabble.com/KPA-1500-on-digital-modes-tp7654828p7654895.html
this way. Even an "ideal" class AB amplifier has a maximum dissipation
> It's interesting that the heat that has to be dissipated is pretty close
> to 1000 watts in all these scenarios! Running the amp at less than full
> power buys you nothing.
>
> 73, Roger
>
>
> On 8/29/2019 8:38 AM, Larry (K8UT) wrote:
>> Pete,
>>
>> I don't run my amp at full legal limit on digital modes, but
>> typically set the input power for about 1000 watts output. One of the
>> interesting characteristics of the amp is increased efficiency as
>> power increases. At 600 watts efficiency is only 38%, whereas at 1000
>> efficiency increases to 50% and at 1500 watts to 60%.
>>
>> (see screenshots)
>>
>> -larry (K8UT)
>>
>> ------ Original Message ------
>> From: "N4ZR" <
[hidden email]>
>> To: "Elecraft List" <
[hidden email]>
>> Sent: 2019-08-29 07:59:23
>> Subject: [Elecraft] KPA-1500 on digital modes
>>
>>> Elecraft's published specs rate the KPA-1500 for 1500 watts output
>>> on all modes. In prepping for this weekend's contest, I've been
>>> running it at closer to 700 watts, because I've found that even just
>>> running on CW, with its much lower duty cycle, my amp reaches 70C
>>> quickly. I don't do that much digital contesting, though, so I'm
>>> wondering whether 1500 watts output is on digital modes is realistic
>>> or a recipe for trouble.
>>>
>>> --
>>> 73, Pete N4ZR
>>> Check out the Reverse Beacon Network
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>>