[Elecraft] RFIth

[Dave]

I wire tie mine closed once in place...

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

On 12/20/21 17:02, Bob McGraw 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-request at mailman.qth.net wrote:
>> Message: 11
>> Date: Mon, 20 Dec 2021 08:34:24 -0800
>> From: Dave<dave at nk7z.net>
>> To:elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] RFI
>> Message-ID:<8cdb19ae-b111-5a6c-3f2a-d29efdd25351 at 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
> 
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