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
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