> N6LF is also WD2XSH/20 whose 630m CW signal I copied up here. Rudy moved
> a couple years ago to new property and has new antenna farm.
> I believe his study of elevated grounds was published in QEX and later in
> QST.
>
> Virtually all transmitting antenna for 630m will be "short" verticals so
> his findings are useful if you consider getting on 630m. EZNEC-5 indicated
> my radiation resistance would only be 0.83 ohms with a 43-foot high
> top-loaded vertical. Actual measurement showed 18 ohms so efficiency is
> 0.83/18 = 0.046. My ground plane is woefully too small: four 70-foot by
> 2-foot wide runs of chicken wire on ground. But most hams have too little
> acreage for anything even close to 1/4 WL (521-foot).
>
> My antenna consists of three parallel vertical wires spaced 1-foot apart
> and shorted by a 1/2 inch copper tube at both top and bottom; horizontal
> leg is two parallel wires spaced 2-foot and 122-foot long (like-wise with
> copper tube shorting bars). The parallel wires lower Q a bit to widen the
> SWR bandwidth which is about 5-KHz. Extra horizontal wire increases
> top-hat capacitance which makes vertical look longer.
>
> I will make a new webpage to show what I am using on 630m (old webpage was
> hacked several years ago and I never resurrected the 600m page).
>
> I may still get my inverted-L repaired and rehung with aid of my prof.
> tower person, though winter wx is not far off up here (freezing temps
> expected within a week).
>
> 73, Ed - KL7UW
> I will probably play with running WSPR and the new FT8 digital modes on
> 630m.
>
> Date: Tue, 19 Sep 2017 11:09:10 -0700
> From: Jim Brown <
[hidden email]>
> To:
[hidden email]
> Subject: Re: [Elecraft] 630M Antenna
> Message-ID:
> <
[hidden email]>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> N6LF's website should be required reading for anyone intending to
> operate these new bands. He's done extensive work on antenna systems for
> these bands.
>
> 73, Jim K9YC
>
>
> 73, Ed - KL7UW
>
http://www.kl7uw.com> Dubus-NA Business mail:
>
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