Kieth,
I see 10 to 14 watts for the 2SC1969 and 100 watts for the 2SC2879 on the
data sheets I have here.
That is for one transistor - and yes, the K2 design is using them in a
conservative manner. To get more out of them, they have to be driven harder
and the power dissipation goes up drastically (the heat sink may no longer
be adequate) and the intermodulation distortion increases a lot. Plus,
those ratings are into an ideal load (read perfect SWR=1).
Hams seem to have a desire to run devices near their maximum ratings, but
even though they can be made to provide more power, the consequence is
reduced component life and durability - and solid state stuff goes POOF
quickly if th heat cannot be conducted away fast enough. A conservative
design should allow the components to live a good long life unless they are
subjected to abuse of some nature.
73,
Don W3FPR
> -----Original Message-----
> I got curious so I dug up the data sheets on the K2 finals and the
> KPA100 finals.
>
> K2 finals say 20 watts output, KPA100 say 100.
>
> Is that for one transistor or two? If two, that suggests the K2 and
> KPA100 are really taking it easy on those parts and they should last a
> long time, right?
>
> - Keith N1AS -
>
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