That's harmonics which the FCC regulates to -43 dBc or better, better
being a bigger number, on 160-10m, and -60dBc for 6 meters and up. That
number IS regulated.
That is not the same as two tone TX IMD which is specified by Elecraft
as around -30dB, and NOT regulated by the FCC, because most hams can't
measure it accurately.
On 10/18/2016 2:53 PM, Wes Stewart wrote:
What method(s) did you use to verify the accuracy of your dB(c)
numbers? I get a little queasy when I see "-48.5 dBc."
On 10/18/2016 10:51 AM, Jim Brown wrote:
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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