[Elecraft] Max power for JT9 with K3S 100?

[Bob McGraw K4TAX]

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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