"I always use 5W, ... when I tune up my external ATU."
Actually, I use 15 watts for tuning both the internal K3 tuner, as well as
my external MFJ-998 tuner. I do this for two reasons:
1) I get much better SWR agreement between 15 watts and full power than I
do with 5 watts and full power, especially on the external tuner.
2) I figure that using a switching-type tuner stresses the 10-watt output
circuitry of the K3 at 5-watts tune power (all that hot-switching). But at
15 watts, the K3 100 watt PA should have plenty of margin.
It might be interesting to know what power levels Elecraft recommends
regarding radio stress during tuning.
Phil - AD5X
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