On Tue,10/18/2016 3:43 AM, Yngvi (TF3Y) wrote:
How fast does IMD deteriorate with increased power from the K3S or K3?
What are the IMD figures when running 20-25W driving a linear amp. such as
the KPA500?
I've looked carefully at this, and so has my neighbor Bob Wolbert, K6XX,
who is an engineer at Elecraft and a serious contester. The first link
shows my measurements, the second is a pdf of the slides for a talk that
K6XX gave to NCCC three years ago. It includes measured data showing how
TX power out and DC voltage affect IMD. In my measurements, increased
IMD causes CW bandwidth to increase. You can see that difference by
comparing measurements at 30W, 50W, and 100W.
http://k9yc.com/P3_Spectrum_Measurements.pdf
http://k9yc.com/K6XXAmpTalk.pdf
73, Jim K9YC
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