That's one of the reasons I asked the question. Normally antenna efficiency is measured in an RF anechoic chamber. I'm not aware of one suitable in size for HF antennas.
Bob, K4TAX Sent from my iPhone > On Sep 9, 2018, at 3:52 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > >> On 9/9/2018 1:03 PM, Mel Farrer via Elecraft wrote: >> VERY CAREFULLY on an antenna range for that purpose. You can model it and >> get an idea of what it should be, but it is installation specific. > > AND the test ranges required for HF and MF antennas occupy a lot of land with > well defined and consistent soil quality. We're talking tens and hundreds of > square miles, the ability to make calibrated measurements in three > dimensions, and military budgets. > > I'm aware of several excellent antenna engineers who have done some great > work with drones to measure antenna DIRECTIVITY. but efficiency is another > BIG step up in both complexity and cost. > > 73, Jim K9YC > > ______________________________________________________________ > 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 > Message delivered to rmcg...@blomand.net ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
