Bill, I do have a Matchbox, but it is not in the shack, All my antennas are resonant, so there is no need for a tuner at the home QTH. The Matchbox serves an an artificial antenna, if I need to devise some strange load to an Elecraft K1, K2, KX1 that I am in process of repairing. Often times a bandpass filter at a specific frequency is needed, and the Matchbox provides that quite nicely.
73, Don W3FPR On 9/10/2012 3:37 PM, Bill K9YEQ wrote: > Don, > > Did I not see a picture of your shack with a Matchbox, or am I thinking of > someone else? > > As sweet as the link coupling is, I would think a servo controlled box could > be designed as an automatic unit... perhaps Wayne could be talked into > designing one starting at QRP level and eventually designing a QRO linker. > > 73, > Bill > K9YEQ > > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm > Sent: Monday, September 10, 2012 1:46 PM > To: Ron D'Eau Claire > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] static buildup on antennas > > Yes, link coupled tuners will solve a lot of those problems. There is no DC > path from the antenna to the transceiver. > However, those link coupled tuners have been disappearing from the face of > the earth at a rapid rate. They are not easily band-switched (the Johnson > Matchbox units were an attempt, but the matching rang was limited)/ > > 73,\ > Don W3FPR > > > On 9/10/2012 2:31 PM, Ron D'Eau Claire wrote: >> It gets tricky when the antenna feed point impedance is several >> thousand ohms such as I see with my 130 foot inverted L on 80 meters >> or with the common open wire fed multiband doublets. >> >> In those cases it's common to use a resistance of 100K or more to >> avoid excessive losses in the resistors. >> >> But, such large resistances require more time to bleed off the >> accumulated voltage. At some point they can no longer drain the charge >> as fast as it accumulates and become ineffective. >> >> My favorite "tuner" for such antennas has always been a link-coupled > tuner. >> No direct-current connection between the antenna and the rig and a d-c >> path to ground for the antenna at all times. But such tuners are not >> conducive to fast, automatic operation. >> >> 73, Ron AC7AC >> >> >> ______________________________________________________________ >> 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 > > ______________________________________________________________ > 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
