Ferrite, chokes, and RFI
234,225
Published 2017-03-05
Buy ferrite on my website: www.kf7p.com/KF7P/Ferrite_chokes.html
More how-to and tech resources on my tech page: www.kf7p.com/KF7P/Tech_Resources.html
ARRL RFI book: www.kf7p.com/KF7P/Publications.html
More info from the ARRL: www.arrl.org/radio-frequency-interference-rfi
W1HIS Choke info: www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2…
K9YC RFI ham: audiosystemsgroup.com/RFI-Ham.pdf
All Comments (21)
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“My child was misbehaving, so I fixed that problem by just wrapping him around some ferrite.”
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great job. No long winded introduction and real life solutions. Thank you.
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Very helpful. I needed to see real-world examples of fixing these problems. Thanks
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Your family is very tolerant and patient
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I googled "How do I turn all of my long cables into 6" cables" and found this video... :) Seriously though, I will be buying a few cores from you...
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This guy taking ferrite seriously
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I have a video as well for ferrites vs stray RF, more or so in layman's terms. This here is a great video too, thorough and precise. 73's✌
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Thank you for the video. Simple yet clear. 👍
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Sewing machine running by itself? Crazy yet interesting. Two common ones at home for me is dimmer switches to AM radio and the coffee grinder to TV signals.
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Great video, but anyone with that much trouble with RF on the house, may be in need of antenna adjustments!
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Hi Chris, first of all let me thank you for your video, it has educated me to no end. I have a rfi problem I would like your advice with. I run a professional music studio and am always trying my best to cut down on noise and interference . Recently I have had a dimmer switch installed on the studios lights. The dimmer switch is an old school MK type double switch not a new led one.. One dimmer for each rooms lighting circuit. I am using new Phillips led warm white bulbs which are great for my studios lighting bills and have been designed to work/dim with regular old dimmers. Indeed the Phillips led bulbs dim perfectly and smoothly, even better using the old mk dimmer than the Chinese led dimmer I had before. However, now it seems that with the dimmer installed I am picking up much more interference in the room while recording. The classic one is a single coil pickup in a guitar. It goes crazy with interference when the lights are on and then shuts up when I turn the lights off. Same with guitar amplifiers. Of course I know that guitar pickups and tube amps always pickup interference anyway it's just that the audible volume of said interference has got much louder since I fitted the dimmer. Please is there any way I can choke/suppress or isolate the dimmer switch in order to reduce the noise/interference without having to sacrifice the dimmer and go back to the standard on full of off switch? Perhaps ferrite beads on the connections to the dimmer? Or do I have to spend a lump on a 1:1 isolating transformer and completely isolate the lighting circuit from the rest of the power in the studio. Any help would be much appreciated. Thank you.
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We have the same dryer. Worked great. 25 yrs and counting
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Legend has it that he was so fed up of his wife’s interference that bound her in ferrite 😂 now she’s very quiet 😂
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Lol I just learned something! Yes, my attention was weakening at the time you mentioned it. Thanks!!! Green video
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Your sewing machine started by itself. Time to put down the ferrite and call a priest.
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Very well put together video thanks
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Wish I had seen this before. Might have saved me a lot of grief. Thanks
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Someone is murdered at 3:10
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Excellent simple, straightforward examples. Thanks. K0KK
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I'm not a ham user, but I've always wondered what those things were and what they did. If I ever start picking up local AM/RF interference again, now I know what to do!