Hi Gayle, Not sure what we are trying to switch... If I got where you are talking about the F/B or front/back is a ratio of rejection the rear element (reflector) of a yagi or quad supresses the rx/tx signal on the back side of the antenna. Thus say a dipole (driven element) will give equal radiation pattern broad side front and back. the reflector on a beam ( longer element) rejects signal to the rear. A directing element ( director) shorter than the driven element in a 3 element yagi or quad enhances the forward direction of your signal. multi element beams only add directors to the antenna each being abit shorter than the directing element behind it. Say a 5 element beam is 1 driven element, 1 reflecting element and 3 directing elements. The more directors the further out your signal is directed and the more rejection of signals that are not lined up to the front of the beam . If I am on the same page with you there is no switch, as to why we use an antenna rotor to pin point the DX wanted in the log.
Hope I read this right and after another cup of coffee I will review the post again. 73 Bill WS5H ----- Original Message ----- From: Willis Cooke via BVARC To: Gayle Dotts ; BRAZOS VALLEY AMATEUR RADIO CLUB Sent: Monday, July 28, 2014 9:30 AM Subject: Re: [BVARC] F/B switch search It depends on what antenna you are talking about. There is no generic front-back switch you can buy. Sent from my iPhone On Jul 28, 2014, at 8:57, Gayle Dotts via BVARC <[email protected]> wrote: I don't see any front to back switches in an internet search. What do you advise for one using a directional antenna that has front/back capabilities? _______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ------------------------------------------------------------------------------ _______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ------------------------------------------------------------------------------ No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4716 / Virus Database: 3986/7936 - Release Date: 07/28/14
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