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I've had the most luck using them for common mode chokes. Especially in mobile installs. There isn't enough room to wrap a coax choke in the headliner when installing a puck mount. I'll use a stack of them around the coax right at the feed point. Probably not necessary for a few hundred watts but a few kilowatts is a different story.

I have some on my xlr mic cable where it connects to the audio gear. They aren't needed at less that a kw carrier. It wasn't an issue with a condenser mic but had issues when I switched to the pr40. I suspect it was because the mic preamp level had to be increased and the preamp doesn't play well with rf.

Some amplifiers don't have enough power cable isolation and you'll have stray rf from the power cables. Ferrite works well here also.

[QUOTE="543_Dallas, post: 665866, member: 21044"] I've had the most luck using them for common mode chokes. Especially in mobile installs. There isn't enough room to wrap a coax choke in the headliner when installing a puck mount. I'll use a stack of them around the coax right at the feed point. Probably not necessary for a few hundred watts but a few kilowatts is a different story. I have some on my xlr mic cable where it connects to the audio gear. They aren't needed at less that a kw carrier. It wasn't an issue with a condenser mic but had issues when I switched to the pr40. I suspect it was because the mic preamp level had to be increased and the preamp doesn't play well with rf. Some amplifiers don't have enough power cable isolation and you'll have stray rf from the power cables. Ferrite works well here also. [/QUOTE]

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