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Old 6th Oct 2019, 1:01 pm   #6
G3PIJpeter
Hexode
 
Join Date: Nov 2011
Location: Chippenham, Wiltshire, UK.
Posts: 323
Default Re: Top band 1.8Mhz antennas

Quote:
Originally Posted by G6Tanuki View Post
Get up as much wire as you can! Then end-feed it against a good earth (lots of buried wires, and/or anything else metal)
Loaded counterpoises are a good substitues for buried earths - a good deal less work for the same or better efficiency (see Moxon's book). I run mine around fences and tune with a series switched inductor with variable capacitor (add a current meter to the counterpoise 'earth' lead and tune for max).

Quote:
Originally Posted by G6Tanuki View Post
... bring the far end down the support and then zig-zag-load it: the zig-zag wires only need to be separated by a few inches. Essentially you're 'folding up' the far end of the wire (the bit which carries little current so contributes little to the actual radiation).
That trick was first discovered pre-war with a short loft aerial for Top Band. Also, Pat Hawker raised the subject in the 1980s. I have attached copies of the two papers that he referenced.

Peter (G3PIJ)
Attached Files
File Type: pdf meander dipole.pdf (576.1 KB, 168 views)
File Type: pdf meandered line antennas.pdf (113.8 KB, 157 views)
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