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 <[email protected]> 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, [email protected] 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 > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
