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, [email protected] wrote:
Message: 11
Date: Mon, 20 Dec 2021 08:34:24 -0800
From: Dave<[email protected]>
To:[email protected]
Subject: Re: [Elecraft] RFI
Message-ID:<[email protected]>
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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