http://elecraft.85.s1.nabble.com/Clever-antenna-tuning-ideas-wanted-tp384403p384406.html
> -----Original Message-----
> From:
[hidden email]
> [mailto:
[hidden email]]On Behalf Of Vic K2VCO
> Sent: Thursday, December 08, 2005 11:30 AM
> To: Elecraft Reflector
> Subject: Re: [Elecraft] Clever antenna tuning ideas wanted
>
>
> I'd like to thank everyone for their suggestions on how to make my 32'
> vertical with 8' elevated loaded radials perform on 80 and 30 meters as
> well as 40.
>
> It's clear I will have to do some major surgery on the antenna to add 80
> meters, such as a trap plus a toploading wire, or a movable wire (N6WG).
> Otherwise, the high reactance and low radiation resistance at the base
> will remain a problem. AB9CA pointed out that a tuner at the base could
> efficiently handle a low resistance if the reactance were tuned out by
> some top-loading.
>
> For 30 meters there seem to be some elegant solutions. W3FPR mentioned
> that two symmetrical radials are enough, and EZNEC agrees that the
> difference in overall gain between two and four is less than 0.1 db!
>
> One approach would be to separate the two pairs of radials and feed them
> each through an appropriate inductance (about 11.5 uh on 40 and 1.7 uh
> on 30). This would resonate the system on both 40 and 30 meters. I also
> noticed (thanks, EZNEC) that with all four radials connected together,
> all I would have to do is short out the existing 40 meter inductance to
> obtain a low SWR on 30! But that would require a switch or relay which
> I want to avoid.
>
> --
> 73,
> Vic, K2VCO
> Fresno CA
>
http://www.qsl.net/k2vco> _______________________________________________
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