Multiband Dipole with Ugly Choke
This project commenced after Paul G4APL read Peter Dodd's G3LDO Multiband Dipole published in the March 2011 Page 31 Radio Society of Great Britain (RSGB)monthly magazine Radio Communication (RadCom).
As there was a requirement for a Multi-band aerial to be used on his GB7CIP HF Pactor links to be configured to cover the 7, 14, 18, 21, 28MHz Amateur RadioFrequency bands, a separate 3.5MHz dipole was already in use and would not be a requirement for the multiband dipole.
He has made multiband dipoles many decades ago for portable use, based on articles in the RSGB Radio Communication Handbooks.
Paul G4APL came
across an excellent web site URL http://www.hamuniverse.com/balun.html
Don, N4UJW, has brought together some excellent examples on how to construct and build a Choke Balun.
A further check on the Hamuniverse.com site in March 2011 illustrated other additional Ugly Choke Balun's and mounting construction. One of the mountingideas will be incorporated in this current project.
The search for materials
Paul checked in the
shed and found that he had most of the require materials, other than the 4 inch pipe cap. Which he purchased from the
local builder merchants.
Element lengths - two required for each half of the dipole – details extracted from G3LDO's article.
Band | Frequency | Length
80m 3.7MHz 18.44m - Not required could be added later as holes drilled in insulators.
40m 7.05MHz 10.06m
20m 14.2MHz 5.03m
17m 18.1MHz 3.89m
15m 21.2MHz 2.84m
The following photographs show the basic steps in the construction of the multiband
The Ugly Balun constructions are detailed in the web site URL referenced in this article.
Monitor police, fire, ham radio, rescue, ships and more!
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