Re: KPA-500 "Output for Input" schedule?

Posted by Don Wilhelm-4 on May 11, 2011; 8:38pm
URL: http://elecraft.85.s1.nabble.com/KPA-500-Output-for-Input-schedule-tp6352735p6353524.html

  Julian,

 From the words of Bob Freiss (the designer) on 9/8/2010 --
--------------------------------------------------------------------------------------------
The KPA500 requires 30 to 40 watts for full output.  With 10 watts of drive
the output will be around 200 watts or a little less.

Bob, N6CM
--------------------------------------------------------------------------------------------

If one takes the lower figure of 30 watts for 500 watts out, that could
indicate a small amount of compression (non-linearity), and I have not
asked how much less than 200 watts with 10 watts drive, but it seems
that the KPA500 has a power gain factor near 16.7.  Perhaps someone with
good wattmeters will measure it over a range of drive levels.

73,
Don W3FPR


On 5/11/2011 3:55 PM, Julian, G4ILO wrote:
> <snip>
>
> So I think Stan WB2LQF deserved a better answer to his request for an
> "output for input" schedule than the statement that it was a linear
> relationship. If Elecraft is indeed claiming the relationship between input
> and output of the KPA500 is perfectly linear then let them say it. Otherwise
> I don't believe it.
>
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