Dave and Jim Our friend made strong mention of SOTA and the KX series of portable rigs and those users often require a multi-band antenna for simplicity and to keep the weight down. Our friend's 40m vertical is also being used on 20m, so, it's reasonable to assume he desires multi-band performance, perhaps even more bands. In portable situations the feeder is often short and sometimes non-existent so there is little or no transformation. Elecraft promote their rigs to be used with non-resonant antennas: why strive for such a wide range matching unit if not? Eric has told us many times that he is happy with odd lengths of wire thrown up a tree and another piece thrown on the ground as a counterpoise, ie multi-band, non-resonant antenna. In these situations lobes and radiation angles are less important than just getting out.
David G3UNA > On 31 July 2020 at 21:28 David Gilbert <[email protected]> wrote: > > > > That's a lot of bad advice all rolled into one. > > 1. Low voltage at the antenna does not mean low voltage at the shack > end of the feedline. That's why it's called VSWR. > > 2. Low voltage at the antenna does not mean low voltages internal to > the tuner, which can be quite high depending upon the degree of > non-resonance. You aren't necessarily "making life easier for the > matching unit" at all. > > 3. Multi-band antennas mean highly variable pattern from band to band. > The same antenna might have a peak to the U.S. (from England) on one > band and a major notch on another band. If you don't care about > pattern, dummy loads match pretty easy too. > > Multi-band antennas are fine as long as you recognize that they are a > compromise. I'd be interested in the reason why an antenna properly > designed for a particular band is a bad idea. > > Dave AB7E > > > > On 7/31/2020 2:04 AM, CUTTER DAVID via Elecraft wrote: > > With Elecraft matching units you don't need (and it can be undesirable to > > have) antennas made for a particular band. You make life easier for the > > matching unit by making your antenna non-resonant on bands you want to use. > > That way the unit does not have to cope with especially high voltages > > which are most likely to cause internal damage. Save your time, weight, > > money for other options. > > > > David G3UNA > > > > > > ______________________________________________________________ > 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
