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Single wide banded is always one with a ferrite. Narrow banded is possibly the air wound.

However the ferrite based one is going to be better 9/10. First of all its choking is mostly resistive - if you've read the G3TXQ page he mentions how reactive choking can actually increase common mode making it worse. Secondly its more tolerant of discrepancies in the building due to the wide almost 20MHz bandwidth of it. Because of how narrow banded the air wound one is, the only real way to guarantee that an air wound one is going to be choking where you want is to use a GDO to measure the resonance of the choke you've built.

[QUOTE="M0GVZ, post: 526648, member: 22312"] Single wide banded is always one with a ferrite. Narrow banded is possibly the air wound. However the ferrite based one is going to be better 9/10. First of all its choking is mostly resistive - if you've read the G3TXQ page he mentions how reactive choking can actually increase common mode making it worse. Secondly its more tolerant of discrepancies in the building due to the wide almost 20MHz bandwidth of it. Because of how narrow banded the air wound one is, the only real way to guarantee that an air wound one is going to be choking where you want is to use a GDO to measure the resonance of the choke you've built. [/QUOTE]

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