On 15/07/2020 20:30, Ken WA8JXM wrote: > Conversely, a non-resonant antenna can have a 1:1 SWR.
On Thursday, July 16, 2020, 03:33:12 AM EDT, David Woolley <[email protected]> wrote: > You can only have a 1:1 SWR at a single impedance. If the design > impedance is purely resistive, that means you can only have 1:1 for a > resistive and therefore on-resonance load (or one that can be treated as > having no reactive behaviour at the frequencies of interest - e.g. an > ideal dummy load). I agree completely, but there's a "catch". Traveling-wave antennas, such as Rhombics, or Beverages, or leaky transmission lines, are, technically, non-resonant. However, they can each present a 50 ohm feedpoint impedance that is purely resistive, and produce a 1:1 VSWR as a result. ;-) So, whether an antenna is resonant or non-resonant isn't the issue. The issue is whether or not a load impedance contains a reactive component. If it DOES, then it can never produce a 1:1 VSWR. 73 de John, KD2BD ______________________________________________________________ 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]
