Thanks for repeating the tests. I started paying close attention to the SWR meter after I got the Alex Loop. The antenna has a very narrow window where the SWR is low (receive noise high). I try not to use the ATU with the loop. Even touching the loop capacitor dial changes its behavior and it is often hard to calibrate it for a low SWR while watching the SWR meter.
The KX3 SWR indication hopefully is only a UI issue. Is there a way to stream SWR and other data off the radio so one can watch what the radio sees? -- VaibhaV Sharma W7VAI On Thu, Apr 10, 2014 at 1:26 PM, Mark Petiford <[email protected]> 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:[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]
