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Re: Topband: EZNEC 5.0 +

To: "'Paul Christensen'" <>, <>
Subject: Re: Topband: EZNEC 5.0 +
From: "Charlie Cunningham" <>
Date: Sat, 6 Dec 2014 21:49:07 -0500
List-post: <">>
Thanks for all the info and the memories, Paul!!

Charlie, K4OTV

-----Original Message-----
From: Topband [] On Behalf Of Paul
Sent: Saturday, December 06, 2014 9:47 AM
Subject: Re: Topband: EZNEC 5.0 +

> Not sure that I can picture just what you are describing, Paul. Even 
> though, I wasn't born until 1944, I've explored just about every type 
> of antenna and I've modeled an awful lot of them.

See the image in the link below:

After rotating the image in your browser, note that the feed to the
horizontal hat is fanned to form the vertical radiator.  What looks like a
complex antenna is nothing more than the classic T but with the horizontal
hat spread out across six conductors.  This was a very popular antenna
during the spark-gap era.

The inverted L form of this antenna simply moved the center fan off to one
side.  This was typically done on smaller city lots as only one additional 
support was needed if you had a multi-story home.   Both forms show up 
regularly on the pages of QST prior to about 1925.

The famous 9ZN antenna was installed on the property of the Edgewater Beach
Hotel in Chicago.  After college, I lived across the street from the hotel
when I was working for RKO Radio back in the mid '80s.  What you see is
really just a super wide conductor for the vertical radiator.  This was not
commonly used.  The impact of the station was probably not so much from the
vertical radiator as it was from attention paid to the extensive ground
system.  Here's a photo of the 9ZN antenna and ham shack taken around 1920. 
This is exactly where the Zenith brand began.

One of the more impressive antennas in the early '20s was that designed for
1BCG for the transatlantic tests. That antenna used a circular counterpoise
as an elevated ground system.  The vertical extends straight up from the
shack roof.  W2PA has assembled a nice page of information about the station
and its operators.

Paul, W9AC

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