I suspect that VSWR tests should be done with constant carrier CW, and not with a fluctuating signal as SSB.
Sent from my iPhone ...nr4c. bill > On Apr 10, 2014, at 4:26 PM, Mark Petiford <rv6am...@yahoo.com> wrote: > > Re: Can you redo the 1-2-1-2 test with FM? > > I just duplicated the original test with my KX3 (FW 1.94/1.28) and got the > same results. I repeated the "1-2-1-2" voice test and the SWR remained > stable as it did in AM as well. > > It looks almost like the KX3 is calculating the SWR using a good current > value for forward power (dropping off to zero as the voice trails off between > syllables or words) but using a stale value (not updated often enough) for > reflected power. When the forward power goes to zero or near zero as it does > on SSB between syllables, it doesn't take much reflected power to give you > the appearance of high SWR if you are using a stale reflected power value. > In AM and FM, the carries remains relatively high stabilizing the calculation > by never letting forward power drop to, or near, zero between voice > syllables. > > Of course, it could also be related to the time constants in the hardware, > but now I am speculating too much...and being a hardware guy, I love to blame > things on the software guys! ;-) > > Mark > KE6BB > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to n...@widomaker.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
