The basic bridge in the MFJ - and lots of other impedance analyzers - is insensitive to the sign of the reactive impedance. You can figure it out by making a "small" change in frequency and seeing whether the reactance increases or decreases. However, this takes additional software in the uP, increases the measurement time, and guessing how large a small step you can get away with is not trivial.
So I think that the original designer made a reasonable tradeoff. I wonder who that was - the design was purchased by MFJ from Vectronics, I think). 73, ian K3IMW On Thu, Mar 8, 2012 at 6:51 PM, Tony Estep <estept...@gmail.com> wrote: > On Thu, Mar 8, 2012 at 10:54 AM, WILLIS COOKE <wrco...@yahoo.com> wrote: > > I wouldn't have mentioned it Jim, except Tony's funny comment muddied > the water... > =========== > Yeah, there's always some smart-aleck to confuse the issue. But > seriously, I don't see why MFJ couldn't put a minus sign or something > on the display. My cheapo Autek gadget (<$100 on ebay) tells you > series and parallel reactance with sign, equivalent C, equivalent L, > phase angle, and some other stuff as well as SWR. I'm not an > MFJ-basher; I have been happy with all the MFJ stuff I have. But in > this case IMHO they left out some worthwhile functionality. > > Tony KT0NY > > > -- > http://www.isb.edu/faculty/facultydir.aspx?ddlFaculty=352 > ______________________________________________________________ > 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 > ______________________________________________________________ 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
