[600MRG] Tomes of long-forgotten lore + eureka moment

[Paul Staupe]

Pat,

Thanks for a great New Year's gift!  I'm not very organized by nature, but
Ive always kept my ARRL Antenna Compendiums in order on a bookshelf in the
garage. When I read your note this morning I went downstairs and sure
enough there was the article entitled "An Electrically Small Umbrella
Antenna for 160 Meters" by Belrose.

The Internet is great, but it sure is nice to look at a hard copy....
that's why we get a couple of different morning papers every day, hi.

Now that I'm working on assembling the kit, I'll have an antenna to match.

Happy New Year Pat and all....

73,

Paul WØAD
/30


On Tue, Dec 31, 2013 at 2:15 PM, Pat Hamel <pehamel at cableone.net> wrote:

> For those contemplating better LF/MF antenna efficiency I have just
> rediscovered a method of top-loading the vertical part of an antenna
> without
> using the fiberglass and copper-tape coil I used.
> In the ARRL Antenna Compendium Volume 7 pp. 3 thru 8 John S. Belrose (SK)
> shows a method of inductive top loading developed by C.E. Smith (see below)
> which uses an inductive sleeve with the tower as the outer conductor. The
> Belrose article was not looking at 600 meters. He calculated a 9 meter tall
> tower at 160 meters.
> The idea, which worked for me, was to get the matching inductance at the
> top
> so the current is maximum all the way up to the low-loss loading. I used a
> fiberglass coil form wrapped with copper tape and hung on the top hat
> spreaders from a tree limb, Smith's idea is for a tower, pipe, or
> concentric
> cages. It would appear easy to drop a thick wire down the center of the
> tower, attach it to the tower at the right point near the bottom and
> insulate it at the top. Then attach the top hat to the wire at the top
> insulated from the tower.
> The Belrose footnote 3 reference is: Smith, C.E. "Short Low Loss AM
> Antenna"
> IEEE trans on broadcasting, 35, June 1989 pp.237-240.
> Happy New Year 2014.
> Pat W5THT & WD2XSH/6
>
>
>
>
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