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Oh when it comes to air wound chokes it's absolutely specific as they're very narrow banded. 5 turns of RG213 on a 4.25" former gives you a RF choke that gives you 8k Ohms choking between roughly 25.5MHz-28MHz. If you increase the number of turns by just two, making it 7 turns that detunes the RF choke by 6MHz so your 8k Ohms choking is now between 19MHz-21MHz.

[QUOTE="M0GVZ, post: 730727, member: 22312"] Oh when it comes to air wound chokes it's absolutely specific as they're very narrow banded. 5 turns of RG213 on a 4.25" former gives you a RF choke that gives you 8k Ohms choking between roughly 25.5MHz-28MHz. If you increase the number of turns by just two, making it 7 turns that detunes the RF choke by 6MHz so your 8k Ohms choking is now between 19MHz-21MHz. [/QUOTE]

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