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:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
