Re: [Elecraft] "Hybrid" Power Supply--is this a bad idea?
Posted by
Douglas Furton on
Jan 25, 2010; 4:09pm
URL: http://elecraft.85.s1.nabble.com/Hybrid-Power-Supply-is-this-a-bad-idea-tp4453756p4454745.html
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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