I would prefer the top loaded antenna. Bandwidth is one factor. Practical
experience (no measurements) tells me the performance would be slightly
better. Having said this, if bandwidth is not a big factor then I wouldn't
go to a lot of trouble to change what you have.
------------------ Wes Attaway (N5WA) ------------------
1138 Waters Edge Circle - Shreveport, LA 71106
318-797-4972 (office) - 318-393-3289 (cell)
Computer Consulting and Forensics
-------------- EnCase Certified Examiner ---------------
-----Original Message-----
From: topband-bounces@contesting.com [mailto:topband-bounces@contesting.com]
On Behalf Of n9bx@mchsi.com
Sent: Tuesday, October 06, 2009 8:46 AM
To: topband@contesting.com
Subject: Topband: 160meter vertical base loaded vs Top loaded.
Good Morning:
I am currently using a 70' base loaded vertical over about 70 random length
radial from 60-140 feet in length. The base loaded coil is from array
solutions and has a 6" diameter coil. Taped about 1/3 down from the top.
It has a low Bandwidth around 35KC as expected. Modeling the same vertical
with 3 Top loaded Capacity wires spaced 120 degrees apart and 51.75' each
yeald a vertical with 90 KC of Bandwidth and an impedance of around 13 ohms,
which can easily be matched with a 1:4 UNUN.
My question is what kind of Efficiency can I expect if I change over to the
top hat wires, VS the loading coil at the base of the vertical? Its still
fall out in the Upperpart of Illinois, and not to late to do somemore
antenna work on the 160 meter vertical.
Thanks
Bruce N9BX 73
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