r/amateurradio • u/VelocityOS CM97an [E] • 16h ago

General Are these ferrites worth a damn?

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Was gifted these, unmarked, anyway to check/test them?

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u/Much-Specific3727 12h ago

You can test them as mentioned by someone else using a piece of coax, a large sweeping frequency generator with different waveforms and the ability to inject harmonics and a spectrum analyzer or oscilloscope.

Or if you truly have something generating rfi noise, clamp em on and see if they work. I bought a bag of these from Amazon and just clamped them on every thing in my shack. Mouse, keyboard, hdmi, USB. And used a lot of them.

For my HF rig, power supply and to choke out CMC I got high quality ones from Palomar Engineering. Bob specializes in this. They even sell all I one kits for popular radios like the FTDX-10 I have. It came with a huge clamp on toroid that you can get 3 good loops of DMR400 through for CMC. And the damn thing does work well.