Why is it a "DUH"? Does it find a better tuning solution than a binary search? If so, how much better and how much would it matter if it did?
Adding a VNA into a tuner adds component cost, placement cost, board area cost, engineering cost, additional manufacturing cost to test and find cal coefficients, etc. If you are building your own tuner, go nuts, but unless you think you need to do that to differentiate yourself somehow from competitors I don't see much benefit of doing it commercially. Eric KI7LTT On Thu, Jul 1, 2021 at 10:38 AM Dr. William J. Schmidt <b...@wjschmidt.com> wrote: > There are tuners that already do this. The old RF-601 military tuner uses > phase and magnitude data to resolve the transform between the transmitter > and the antenna. While it was before LCD displays, its easily adaptable. > In fact every tuner I've ever built (save novice days) has used this > principle. Its much easier to understand what the tuner is doing if you > think in transform (Smith-chart) space. Starting with the transform > solution means also means you don't need to use the "hunt"/ "branch and > bound" types of binary searches to find the tuners transform solution. > It’s a DUH if you think about it. > > > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ > > email: b...@wjschmidt.com > > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> > On Behalf Of Al Lorona > Sent: Thursday, July 1, 2021 12:09 PM > To: Elecraft Reflector <elecraft@mailman.qth.net> > Subject: [Elecraft] The next generation KAT500 > > The recent thread on small and inexpensive vector network analyzers made > me wonder if and when someone will make either a manual or automatic > antenna tuner with something like one of those VNAs used as a front panel > display. With the VNA in Smith Chart format, how cool would it be to tune > the tuner and watch the antenna impedance move toward the center of the > Smith Chart? The calibration coefficients of the VNA could be set at the > factory and stored in EEPROM since they wouldn't change much over the life > of the tuner other than some temperature and aging effects (but even the > cal vs. temperature could be pre-measured at the factory). > > To my knowledge all commercially available tuners simply display the > measured SWR as a single number; providing a Smith Chart (or rectangular > graph if you wish) swept over frequency would be a quantum leap in the > information presented to the user. > > Maybe if and when Elecraft decides to design the next generation of the > KAT500, or maybe this has already been done and I don't know it? > > Al W6LX/4 > > ______________________________________________________________ > 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 b...@wjschmidt.com > > > -- > This email has been checked for viruses by AVG. > https://www.avg.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 garn...@gmail.com -- --Eric _________________________________________ Eric Garner ______________________________________________________________ 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
