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Air core baluns

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Air core baluns

by Richard » 19 Feb 2005, 20:02

Hi group
Can anyone advise how to make an air cored balun to couple 75 ohm twin lead feeder of approx 70' from a half wave dipole to an unbalanced 50 ohm transceiver input, placing the balun at the rig end?
regards
Richard
G4ICP
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It will have to be tuned

by Earps » 13 Jun 2005, 14:16

An air core balun that meets that requirement will have to be tuned. If you want a balun that is untuned you'll have to wind transformer windings on a toroid core. Toroid transformers are easy to make. I would use a ferrite toroid and avoid the need for tuning.
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Re: Air core baluns

by Kendall » 13 Nov 2010, 21:34

If you make the 75-ohm feed-line 1/4 wavelength long, it will function as a balan and you won't need an air-core balun.

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