Re: End Fed antennas w/ uBITX #ubitx
Gordon,toggle quoted messageShow quoted text
I think just measuring the SWR into the antenna system using a short 5 to 10 foot of coax from matchbox to antenna analyzer
gives a pretty good indication of where things will start getting lossy, for both loss in the toroid and in a long coax.
The published SWR charts on myantennas.com (and QST review) are a good indication of what you will get,
agree well for frequencies at which the SWR is under 2.0. With a long piece of coax, the low SWR numbers
remain about the same, the high SWR numbers shoot up considerably.
That's as I recall, it's been a couple years since I looked hard at that.
You do need some coax between antenna analyzer and the matchbox.
Take it down to a few inches with an electrically isolated analyzer and things get whacky
due to lack of counterpoise.
On Fri, Aug 3, 2018 at 07:33 AM, Gordon Gibby wrote: