[RFI] RF & Ferrites,

[Dave Cole]

See my post to the other fellow and the links to Jim's site.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/25/20 6:37 AM, AA5CT via RFI wrote:
> re: "What is best practice to keep RF out of audio and Mic lines? 160 through 10 meters."
> 
> 
> Joe,
> 
> IN a nutshell (and for starters):
> 
> a) stay out of the near field of the antenna.
> b) operate into a 'balanced' antenna (this rules out end-feds)
> 
> 73, de AA5CT Jim
> 
> .
> .
>   
> 
> On Tuesday, February 25, 2020, 8:13:39 AM GMT-6, Joe <nss at mwt.net> wrote:
> 
> 
> 
> 
> 
> Want to make sure RF stays out of my audio and Mic wires.
> 
> Now I see many small clip on ferrites like these,
> 
> https://img2.freepng.es/20180420/bgw/kisspng-ferrite-bead-ferrite-core-electronic-filter-electr-bead-5ad99198298d83.5874384515242080241702.jpg
> 
> Now is it better to get some with a larger hole, so that multiple passes
> can be made, like this?
> 
> https://www.gearslutz.com/board/attachments/remote-possibilities-in-location-recording-amp-production/610734d1480262732-led-lights-hum-how-best-deal-ferrite-chokes-_.jpg
> 
> And when it comes to doing multi pass if that is better to do,
> What is best performance, just cram in as many turns as you can as seen
> above?
> 
> Or wind the turns in an organized fashion, like a toroid inductor, where
> the turns do not overlap each other, kind of like this?
> 
> https://i.ytimg.com/vi/LuMlM8zWQFk/maxresdefault.jpg
> 
> What is best practice to keep RF out of audio and Mic lines? 160 through
> 10 meters.
> 
> Joe WB9SBD
> 
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