Aaron,
I cannot give you a specific answer, but go by the heat.
I would suggest you first try 5 watts, and operate at that level for a
while (I suggest 10 minutes).
Then check the heatsink temperature - if you can hold your fingers on it
for longer than 5 minutes, then all is well.
Increase the power by about 3 watts and try again.
When the heat gets too much to comfortably hold your fingers on the
heatsink (next to the PA transistors), then you have exceeded the
maximum power which you should use for transmit.
The generalized answer is that you should consider those modes as
continuous duty and use 1/2 the normal full power output, but I suggest
doing the test I referred to as a specific power limit for your
particular K2.
73,
Don W3FPR
On 8/13/2021 3:38 PM, Aaron K5ATG wrote:
What is the recommended highest power level for a QRP Elecraft K2 to
operate on digital modes like FT8, JT65 etc, without blowing the PA's?
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