[Elecraft] KPA1500 Linearity

[Wes Stewart]

I don't have a KPA1500 or enough power attenuators to test my KPA500, but I have 
spent many dozens of hours looking at TX IMD on my two K3s.

I will simply say, if you haven't already, check the IMD of the bare K3 before 
blaming the KPA1500. Garbage in, garbage out.  That of course doesn't pardon the 
KPA for dropping gain.

Wes  N7WS


On 6/9/2018 2:21 PM, K9MA wrote:
> I recently ran a two-tone test and measured CW power gain. (SN1078) It doesn't 
> look good.  The two-tone waveform shows distinct "flat-topping", and the power 
> gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z amplifier is 
> much better.  Has anyone measured IMD or linearity, or seen any test results?
>
> While I'm primarily a CW operator, I'd be very reluctant to use the amplifier 
> on SSB.
>
> 73,
>
> Scott K9MA
>