[Elecraft] Max power for JT9 with K3S 100?

[John Simmons]

Fred Cady's book:

"There are four fans speeds that turn on at different temperatures."
"If the temperature reaches 84 degrees C the KPA3 will be bypassed until 
the temperature falls to stop any damage as a last-ditch backup measure 
to protect your expensive power transistors from the excess heat."

-de John NI0K


Bob McGraw K4TAX wrote on 4/3/2020 6:39 PM:
> Frank:
>
> The duty cycle for the transmitter, as stated in the manual, is;  CW 
> and SSB modes, 100% - 10 min, 100 W key-down at 25C ambient.   Do note 
> that 6M has reduce power values of 85 watts {51 -52 MHz} or 70 watts 
> {52 - 54 MHz}
>
> The duty cycle for JT-9, 1 minute transmit, 1 minute receive would be 
> 50%.   I frequently run 100 watts on WSJT-X FT-8 with no issues.  Just 
> pay attention to PA temperature.  It should be 60 C or less.   Also 
> this is with FANS in the automatic mode.
>
> 73
>
> Bob, K4TAX
>
>
> On 4/3/2020 4:18 PM, Frank O'Donnell wrote:
>> I've been using JT9 mode on 630m this winter with my K3S outputting 
>> to an external class D amp.
>>
>> Now I'm interested in trying some JT9 QSOs with some people currently 
>> operating on 160m. For me this would mean outputting directly from 
>> the K3S (with internal tuner) to the antenna.
>>
>> Given the 1-minute cycle time for JT9, are there recommendations 
>> (official from Elecraft, or otherwise) on maximum power to use in a 
>> situation like this? And/or, is the answer dependent on the SWR I can 
>> achieve with the antenna?
>>
>> Thanks and 73,
>>
>> Frank K6FOD
>>
>>
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