[Elecraft] "Hybrid" Power Supply--is this a bad idea?

[Douglas Furton]

Guy --

> Key-down tuning for QRO is a no-no, as is RTTY.   They spec the power
> supply at 22 amps -->> 25% duty cycle <<-- or 5 amps continuous.  12.5
> volts times 5 amps is 62.5 watts.  If one figures in the usual 50%
> efficiency of transistor rigs, that's 31 watts brick on key, a figure
> that will be need to set as a tuning power limit in an auto-tuner rig.
> Probably better to say 25 watts continuous and enough to drive an amp
> that drives with 50-60 watts, IF the amp can be tuned at half power.
> Otherwise, tuning the amp would require a pulser or string of dits.
> 

You're right on with the 30 watts key down; I just did the experiment.

It's nice that the KAT100 tunes with 20 watts, and quickly at that.

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