Posted by
Reinaldo Leandro on
Jan 25, 2010; 8:11pm
URL: http://elecraft.85.s1.nabble.com/Hybrid-Power-Supply-is-this-a-bad-idea-tp4453756p4456426.html
>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.
>
>For a suitcase situation it would be ideal, just back the power off.
I have been using the small supply with my K3 all the time. No distortion or
clicks heard or reported on SSB and CW at 100 watts out.
A very neat package when combined with the SPE 1KFA lineal amplifier, that
needs so little input power that even RTTY at 500 W out is of no consequence
to the Gamma Research power supply limitation.
73
Reinaldo, YV5AMH
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