The Hitchhiker's Guide to OCFD
The
Denby Dale Amateur Radio Society invited me to give a presentation on Off-Center-Fed Dipoles, which I happily accepted. Due to the length of the material, the presentation was divided into two parts.
A 2-Part Video about Off-Center-Fed Dipole (OCFD) antennas.
Note: The information presented in these two presentations is the result of 11 years of researching OCFD antennas and baluns for OCFD antenna. This consisted of building, erecting and measuring about 30 different OCFD antennas, making over 3000 field measurements with antenna analyzers and a clamp-on RF Ammeter for measuring Common Mode Current. Most of the work was analyzing the results of these measurements and presenting these results in a format that is easy to understand.
Part-1 explains the theory of how the antenna works, warning about of the common mistakes people make when building them. It explains why the OCFD is not quite a harmonic antenna and shows how to compensate for that.
LINK to Part-1 video:
https://www.youtube.com/watch?v=JWt3sLEHgqQ
Part-2 shows exact details for building your own (d-i-y) OCFD antenna. It explains why the Hybrid-Balun is the best solution and shows exactly exactly how to build the two different baluns inside of a Hybrid-Balun.
LINK to Part-2 video:
https://www.youtube.com/watch?v=uOQ1Tmn2J9w
There is a Commentary page for each presentation part where you find backup material, and links to information on other web sites.
Click on Photos to view.
Here are the links to Support Pages:
Some of the slides have more detailed information on their associated "COMMENTARY" page. When this is the case, you will see an icon on the slide indicating more detailed information is available. It looks like this --->
A LINK to the COMMENTARY page for each presentation part is shown above, to the right of the DOWNLOAD.