[Elecraft] Elecraft gear relative IMD

[Barry N1EU]

Pre-distortion dsp processing on the tx signal makes a DRAMATIC
improvement.  Check out the tx spectrum and waterfall outside the filter
passband on this video before and after W1AEX switches in pre-distortion at
34 seconds in:  https://www.youtube.com/watch?v=MCm3mKHyuAo

73/HNY,
Barry N1EU

On Thu, Dec 31, 2015 at 7:34 AM, Kevin Stover <kevin.stover at mediacombb.net>
wrote:

> Two different animals.
> Harmonics and spurs are regulated by the FCC to be at least -43dB down on
> HF and -60dB down on 6 meters.
> The K3(s) meets those specs easily as evidenced by a couple of QST reviews.
> IMD is not regulated I think because most hams don't have the test
> equipment to pull it off accurately.
>
> All of this IMD hullabaloo would quickly go away if the manufacturers
> would switch from 12V finals to 50V finals or used pre-distortion of some
> sort. How much will Ham's pay to clean up the IMD problem when the FCC
> doesn't regulate it?
>
>
> On 12/30/2015 9:09 PM, ac5p at sbcglobal.net wrote:
>
>> Who has some measured 2 tone IMD test figures for an actual  K3/K3S at
>> full and reduced power levels and at supply voltage levels between 12-15
>> volts?Must assume the Harmonic and Spurious Outputs exceed 50dB below
>> carrier @ 100W within ham bands as per Elecraft manual specs.  HOW  much
>> better than 50dB with above variables is the question?   Can someone share
>> these figures?
>> 73,Mike  AC5P
>>
>>
>
> --
> R. Kevin Stover
> AC0H
> ARRL
> FISTS #11993
> SKCC #215
> NAQCC #3441
>
>
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