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According to the chart you posted, a 5 turn/7 inch air core choke with RG-213 ('RG-8' dia) coax produces only >500 ohms resistance to common-mode current. That isn't enough resistance. So, you are quite right.

When using a 4.25 inch air coil choke form with either RG-8 or RG-58 coax using 5 turns, it will produce >5k ohms of resistance to common-mode current. That would be enough and useful for common-mode current issues.

Thanks for the reminder, Bob . . .

[QUOTE="Robb, post: 344928, member: 8446"] According to the chart you posted, a 5 turn/7 inch air core choke with RG-213 ('RG-8' dia) coax produces only >500 ohms resistance to common-mode current. That isn't enough resistance. So, you are quite right. When using a 4.25 inch air coil choke form with either RG-8 or RG-58 coax using 5 turns, it will produce >5k ohms of resistance to common-mode current. That would be enough and useful for common-mode current issues. Thanks for the reminder, Bob . . . [IMG]http://www.karinya.net/g3txq/chokes/choke_impedances.png[/IMG] [/QUOTE]

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