Robert,
Your take on my operational status is fairly accurate. I am mechanical by
nature and have a limited knowledge in the electronics arena. This is why I
like to build antennas and work, (Limited), with amplifiers. This is the
part of the hobby that I can work in. Again, this is why that I rely on
'seasoned' amateurs for assistance.
I have built many antennas, from dipoles to 6 element yagis. With that
said, I do not possess the knowledge to completely design my own antennas.
I rely on other's designs as a starting point and work from there.
I posted the request here because I knew I would get responses from
'seasoned' amateurs that I respect and have greatly helped me in the past.
I sent an e-mail to the article's author, but have not received an answer.
I am sure he is busy, as all of us are.
I truly respect and appreciate your post. I was hoping that someone who was
familiar with this type of antenna, or antennas that are physically
shortened could assist me with understanding how to check for resonance once
the antenna was manufactured.
At the moment, I am limited to TV rotors, until my tower is erected. This
antenna appealed to this limitation.
I plan to construct this antenna in the next couple of weeks. I will be
using 3/8" o.d. 316SS tubing for the elements. I am going to do away with
the wire end sections and bend the tubing to make the elements. I use a
Swagelok roller tubing bender that allows for > 120 degree bends.
If this design works fairly well, I plant to build a 10M version. I see
that the 10M version was discussed from the 50's through the 80's. I will
probably order the past articles to see what they had to say.
If the moderator takes issue with my post then so-be-it. My post is ham
related, (for learning purposes), and I do not see where it will cause him a
problem.
Again, I appreciate your response.
73, Doug
N9XTF
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Robert Chudek - KØRC
Sent: Monday, December 18, 2006 4:13 PM
To: amps@contesting.com
Subject: [Amps] QST Jan 06 (Off topic)
Hello Doug,
Yup, your question is off topic for this group, but I hope the moderator
will tolerate a few replies to your question.
When I read your question and look at your callsign & QRZ listing, I
speculate you fall outside the "very seasoned 'professional' amateur
operator" who populate this forum! :-)
I strongly encourage you to try your hand at building that antenna, or any
antenna, for that matter. Whether the result is a stunning success or hardly
outperforms a standard dipole won't be as important as what you will learn
along the way! Fabricating an antenna is similar to building an amplifier
because it combines mechanics/fabrication, electronics/RF theory, and of
course a bunch of magic!
You may want to join the TowerTalk reflector because that groups focus is
primarily tower and support structures, but they also get into antenna
discussions from time to time. Oh, and of course, how to determine "true
north", bird deterrents such as "plastic owls", and how to prepare PL-259's
and seal them properly. Fun stuff!
73 de Bob - KØRC in MN
------------------------------
Message: 9
Date: Mon, 18 Dec 2006 16:15:31 -0500
From: Doug <dcoffman@iquest.net>
Subject: [Amps] QST Jan 06 (Off topic)
To: "" <amps@contesting.com>
Message-ID: <1166476531.458704f35c8ca@webmail.iquest.net>
Content-Type: text/plain; charset=ISO-8859-1
All,
This is off topic for this group, however what is the consensus of the 17
meter "Wonder Bar" antenna?
>From a stand point of low wind load and some directivity, this looks like a
good project for my QTH. I do have questions concerning tuning and spacing
of
the elements.
First off, is this beam actually worth building?
I own the MFJ 249 (pre B version) and a Grid Dip Meter. I would like to
better
understand how to tune the elements for resonance.
There were no formulae given or stated for construction of this beam or
construction of a similar beam on another band. A Google search did not
yield
much information. I was contemplating ordering the older QST articles that
were referenced.
73,
Doug - N9XTF
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