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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