Others can speak more authoritatively about this, but I thought those
clamp-on cores, where they go right on the existing run of coax, offered
too little inductance to be of much use below VHF. Experts?
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at <http://beta.reversebeacon.net>.
For spots, please use your favorite
"retail" DX cluster.
On 12/20/2021 8:02 PM, 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-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
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