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Hf Antenna Question
It's hard to beat stacked ferrite
toroids of differing materials as a foundation for an excellent all-HF-band 1:1 choke-balun. I know of no single balun that can cover 7 MHz to 148 MHz well. 1/2WL self-resonance defeats the choking action when trying to cover 4+ octaves. Can you direct me to more good information (as in NOT sales literature) about ferrites and toroids as choke baluns? The ARRL Handbook mentions the use of 1:1 baluns on p. 21.16 (Transmission Lines): For 3.5 to 30 MHz, the recommended choke is 10 ft and 7 turns using RG-8, 58, 59,8X and 213 (I don't think I've even heard of the last two) W2DU has a 50 bead balun over RG-303. As you may recall, I am using a homemade G5RV and I simply connected RG-8 directly to the ladderline portion. I can see this connection right out my window (2nd floor shack). I am unaware of any significant problems as it is. Should I consider using one of these methods and re-do my antenna? Thanks for being one of the experts that doesn't talk down to the "rest of us". John AB8O |
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