[Elecraft] KPA-500 "Output for Input" schedule?

[Don Wilhelm]

  While those results are very good, I would like to point out that it 
is from a sample of one KPA500.  I would suggest that an allowance of 
10% be considered over the entire population of KPA500s just due to 
component tolerances giving rise to some unit to unit variation.  Even 
using the 10% variation criteria, the KPA500 is more linear than many 
other available amplifiers.  Elecraft has created another winner.

Those measurements Gary made have substantiated that the KPA500 can be 
useful whether the driving transceiver is a K1, or K2/10, a K2/100 or a 
K3/10 or a K3/100 or some other brand of transceiver from QRP levels to 
100 watt class transceivers.

73,
Don W3FPR

On 5/11/2011 11:05 PM, Guy Olinger K2AV wrote:
> Adding a power gain and rounding to nearest two digit integer,
> considering accuracy of measuring device (rarely more than two
> significant digits), it is safe to say  that the amplifier keeps its
> linearity to 650 watts.  The variability at 325 and 410 is most likely
> the measuring instrument's  issues at lower powers.
>
> The linearity at the top PEP level is the most important, as squaring
> at that level will produce the most distortion energy.  Really quite
> good.
>
> .............................  Power Ratio
>
> 325W @ 15W drive   21.67  22
> 410W @ 20W drive   20.50  21
> 490W @ 25W drive   19.67  20
> 510W @ 26W drive   19.61  20
> 530W @ 27W drive   19.63  20
> 560W @ 28W drive   20.00  20
> 580W @ 29W drive   20.00  20
> 600W @ 30W drive   20.00  20
> 630W @ 31W drive   20.32  20
> 650W @ 32W drive   20.31  20
> 675W @ 35W drive   19.29  19
> 690W @ 37W drive   18.65  19
> 700W @ 40W drive   17.50  18
>