First off - thanks to everyone who responded to my question about
adding a 40 meter beam to my "magic" loaded tower. I think regardless
of what happens - someone will be right! I think the one thing
everyone agreed on is to try it. I will try and make some measurements
before and after to see if there is any change.
The fact that the KLM elements are insulated might help.
As far as a procedure - I think empirical examples are probably the
best way. I would like to offer a location for examples to be stored.
So, write up something on what works for you, and I will create a
web page with all the data. You should include things like the
tower height - height of various antennas - gamma dimensions (height,
conductor size, distance from tower) - capacitor values, radial
system description and any notes you can give about the tuning
process and performance.
If enough people contribute to this library - then something close
to your situation can be used as a starting point.
Bandwidth would also be an interesting thing to note. At my previous
QTH - I had a flat antenna from 1.6 to 1.9 megaHertz - which would
indicate a lot of loss - however the antenna really played!! W2GD
saw a similar result with a similar antenna.
The 40 goes up tomorrow - we shall see what happens!
73 Tree N6TR / K7RAT
tree@contesting.com
--
FAQ on WWW: http://www.contesting.com/topband.html
Submissions: topband@contesting.com
Administrative requests: topband-REQUEST@contesting.com
Problems: owner-topband@contesting.com
|