K2/10 PS voltage vs IMD? (was Re: Issue Resolved K3 Voltage on TX)

[Al Gulseth-2]

(My apologies if this has been covered and I missed it in the archives.)

Would the 14.5V recommendation also apply to other Elecraft rigs (in my case a
K2/10) for best IMD perfomance? Are there any tradeoffs in other areas at
that voltage vs. 12.6 (i.e. battery) or 13.8?

TNX/73, Al

On Tue October 27 2015 11:45:06 am Jim Brown wrote:

> On Tue,10/27/2015 8:46 AM, Bill W4ZV wrote:
> > If you operate SSB, you might want to run higher voltage at the K3
> > terminals (e.g. at 14.5V which is below the 15.0V spec) to minimize IMD.
>
> IMD is just as much a factor on CW as on SSB. CW is really 100% AM of a
> carrier by a square wave, which we all know is a lot of AF harmonics,
> the strength of which is dependent on the rise and fall time of the
> keying waveform. IMD is clearly visible in the sidebands of CW signals
> on a spectrum display set for very good frequency resolution -- like a
> P3, and especially a P3 with SVGA.
>
> Take a look at http://k9yc.com/P3_Spectrum_Measurements.pdf
>
> These data are with power supply voltage in the range of 12.5V.
>
> 73, Jim K9YC
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