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It is likely that in the case of the radio, there are additional RF chokes between the PA board and the power cord. I did however, miss the small chokes you mention here. Thanks for pointing them out. As you say, they are small for the job and it's not just the DC resistance causing voltage drop. It's the lack of enough impedance at RF to block the amount of RF present in this location. One pass through a bead this size, does not offer an ideal place to drop unwanted RF.

[QUOTE="Shockwave, post: 740303, member: 10882"] It is likely that in the case of the radio, there are additional RF chokes between the PA board and the power cord. I did however, miss the small chokes you mention here. Thanks for pointing them out. As you say, they are small for the job and it's not just the DC resistance causing voltage drop. It's the lack of enough impedance at RF to block the amount of RF present in this location. One pass through a bead this size, does not offer an ideal place to drop unwanted RF. [/QUOTE]

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