Even when properly sized, as an added insurance policy, I run a zip tie around the perimeter of the clamp-on and cinch it down tight to ensure that the two halves are in solid contact with each other. It may not be a problem, but just in case there is any play or give in the plastic snap and enclosure, this added step would address that.
73, Dave - N5DCH > On Dec 20, 2021, at 6:02 PM, Bob McGraw <rmcg...@benlomand.net> wrote: > > For those using the clamp-on ferrite devices, when installing them, be sure > part A closes completely and solidly contacts part B. Otherwise, there is > no flux path and the device is ineffective. If it is closed and loose on the > cable, then that's good. If it is closed or difficult to close, it isn't > large enough for the cable and will likely not be effective. Any gap > between the halves renders it worthless for the application. > > 73 > > Bob, K4TAX > > > On 12/20/2021 6:18 PM, elecraft-requ...@mailman.qth.net wrote: >> Message: 11 >> Date: Mon, 20 Dec 2021 08:34:24 -0800 >> From: Dave<d...@nk7z.net> >> To:elecraft@mailman.qth.net >> Subject: Re: [Elecraft] RFI >> Message-ID:<8cdb19ae-b111-5a6c-3f2a-d29efdd25...@nk7z.net> >> Content-Type: text/plain; charset=utf-8; format=flowed >> >> Hi, >> >> Purchase some FT240-31 ferrite cores, >> (https://www.farnell.com/datasheets/1912768.pdf), and wind at least 5 >> turns of each cable going to, or from, the computer through the ferrite. >> >> I have several of these, and they stopped ALL of my RFI issues with my >> computer, and with a weather station I have as well. >> >> Shop around looking for the best price, some folks are asking 10 bucks >> for one of these, others are asking 5 bucks... I use Newark, and >> Digikey as my goto places. >> >> Also look to K9YC's site, for more information on how to make the chokes... >> >> http://k9yc.com/2018Cookbook.pdf >> >> 73, and thanks, >> Dave (NK7Z) >> https://www.nk7z.net >> ARRL Volunteer Examiner >> ARRL Technical Specialist, RFI >> ARRL Asst. Director, NW Division, Technical Resources > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to david.n5...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
