But note that for the 43' mast they use an autotuner located at the base of the mast, no coax losses involved. For the 33' mast they use ~50' of various pieces of coax with the associated losses. This a very biased comparison.
If you are going to use a non-trapped, and hence non-resonant, vertical it is best to put the tuner at the base of the mast. Otherwise the coax losses will eat up a fair amount of the available power, even for a 43' mast (although they don't tell you this). 73 de dave ab9ca/4 Paul Christensen wrote: >> The 43' vertical is recent fad and it makes no sense at all. Virtually >> any trapped multiband vertical should easily outperform it. > > Steve, > > I thought the same until I read this: > > http://vk1od.net/antenna/multibandunloadedvertical/ > > According to the author, the so-called "magic" of the 43-foot length is that > radiation resistance remains quite high across the HF spectrum and thus, > system losses are minimized. Compared to a 33-foot vertical, system losses > are much lower across the spectrum. > > But to your point, a trapped multi-band vertical can offer similar > performance. Personally, I think the negativity associated with trap loss > in multi-band antennas is grossly overblown. Other systematic losses mask > what little loss exists in most trapped antenna designs. > > Anyway, not sure how valid all this data really is, but the data presented > is interesting > > Paul, W9AC > > ______________________________________________________________ > 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
