[Elecraft] Does KPA1500 have these KPA500 characteristics?

[Jim Brown]

On 5/24/2018 7:30 PM, Wes Stewart wrote:
> I haven't measured IMD on my KPA500 either since I don't own two 
> generators that are clean enough with the necessary power to do so. 

I evaluate IMD by looking at keying sidebands of a long series of dits, 
as I posted hear yesterday. Details of the measurement setup and  
method, and lots of results, are here. 
http://k9yc.com/P3_Spectrum_Measurements.pdf

It's well known that IMD in the K3/K3S increases at rated output, and is 
a lot lower at the levels needed to drive a power amp. It takes 25-30W 
to drive the KPA500 to full power, and about twice that to drive my Ten 
Tec Titans. The K3/K3S is pretty clean at these levels. The plots for 
the two amps look almost exactly the same, and have the same shape as 
the K3 at those drive levels.In other words, neither amp is increasing 
bandwidth. Note that these measurements are of the envelope of peaks, so 
they are, in essence, capturing clicks.

IMD also increases with low DC supply voltage. I've not done any 
disciplined measurements to put numbers to it, but K6XX has. His data is 
in this pdf slide show. http://k9yc.com/K6XXAmpTalk.pdf

73, Jim K9YC