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Antenna theory and design

Antenna theory and design

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Balun for LOG-P Antennas

DeonRFI

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Greetings from Alberton in South Africa. I wondered if anybody on the group can advise me what balun I should use on a HF Log-P antenna. I have an antenna made by Tennadyne and I don't like to feed the antenna with the coax hanging from the far tip of the boom at 45 degrees down, firstly it looks terrible and secondly in my opinion will need a lot of maintenance from the movement when the wind blows, all and all it just seem as a cop out to do the job properly. I want to feed the antenna close to the point where the antenna bolt to the mast, and run coax from this point to the transmitter. From reading on the internet some suggest to put a current balun at the mounting of the mast and a second balun closer to the feed point, is this necessary? Practically I think to run coax from the balun at the mast mounting inside the bottom boom to the tip then connect directly to the front end of the boom by making a "hairpin" arrangement to the top boom from the center of the coax. What will the specifications / design info be for a DIY balun for this project?

Thank you in advance for your comments on this issue.
Best regards
Deon ZS6RFI
 

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