Hello Charlie & Paul,
I'm using a single vertical wire Marconi T with a pair of 6 wire cages for
the tophat. Each cage starts at a single point at the vertical top, and has
3 foot dowel spreaders at the far end. The reason is strictly to add more
toploading in a smaller space. I needed another vertical to use in a phased
array, but there were no suitable tree locations (I don't have any towers).
So the vertical is suspended between two trees which were not far enough
apart for resonance. EZNEC modelling provided the specifics. Besides, it
looks vintage...
Brian K8BHZ
-----Original Message-----
From: Charlie Cunningham
Sent: Saturday, December 06, 2014 9:49 PM
To: 'Paul Christensen' ; topband@contesting.com
Subject: Re: Topband: EZNEC 5.0 +
Thanks for all the info and the memories, Paul!!
73,
Charlie, K4OTV
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Paul
Christensen
Sent: Saturday, December 06, 2014 9:47 AM
To: topband@contesting.com
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.
http://tinyurl.com/kdzkt2x
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.
https://musiccityvintageradio.files.wordpress.com/2011/03/house.jpg
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.
http://w2pa.net/HRH/crossings-iii-accolades/
Paul, W9AC
---
This email is free from viruses and malware because avast! Antivirus
protection is active.
http://www.avast.com
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|
