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Re: [Yaesu] Another form of eliminating ITV

Subject: Re: [Yaesu] Another form of eliminating ITV
From: John Tait <bravo@iol.ie>
Date: Thu, 20 May 2010 10:14:42 +0100
List-post: <yaesu@contesting.com">mailto:yaesu@contesting.com>
  Hi Eduardo..
      As stated below....ferrite is a Ham's best friend, when it comes 
to TVI, BCI and RF in the shack.  I don't know if you can buy ferrite 
cores in Cuba, but there is a cheap source of this material.  I have 
been salvaging ferrite from old TV sets, and CRT computer monitors for 
years. First of all there is the ferrite bead , which can be salvaged 
from the VGA lead. These will usually fit RG58 coax very nicely. Then 
there is the line output transformer. Remove the windings, and you have 
a nice square shaped ferrite core, which is great for making baluns, or 
for use as chokes on TV mains leads, antenna leads, loudspeaker leads 
etc. Last but not least, there are the scan coils. Remove the windings, 
and you have a large chunk of ferrite. This can be cut or broken into 
useful pieces, onto which you can again wind mains leads etc to create 
an RF choke.
    Good luck with your ITV (TVI) problem Eduardo
               Vy 73
           John EI7BA

On 19/05/2010 20:49, N7HIY wrote:
> hello Edwardo
> try these links, lots of good info
> is it cable tv interference, ferrite cores may be your best solution.  do
> you have access to ferrite cores in Cuba?  ferrites work well both on 
> the tv
> coaxial cable into the tv and the ac power cord to block ham radio RF 
> from
> entering the set via either path.  Ferrite cores can also be used on 
> tv flat
> twin lead to dissapate common mode TVI picked up on the flat lead from 
> the
> antenna.
> http://audiosystemsgroup.com/RFI-Ham.pdf
> http://www.hs0zee.com/Amateur/TVI/TVi%20Filters.htm#CoaxStubs
> http://www.arrl.org/cable-television-interference
> http://www.antennex.com/shack/Dec99/beads.htm
> http://www.arrl.org/files/file/Technology/RFI%20Main%20Page/Hallas.pdf
> https://www.amidoncorp.com/specs/2-16.pdf
> https://www.amidoncorp.com/categories/7
> Cliff N7HIY
> ----- Original Message -----
>> From: "Eduardo Somoano C"<co8ly@frcscu.ciges.inf.cu>
> To:<smirk@mailman.qth.net>;<yaesu@contesting.com>;<sedxc@contesting.com>;
> <rfi@contesting.com>;<nodxa@lists.contesting.com>;<nodxa@contesting.com>;
> "Lista 160M"<topband@contesting.com>;<contest@mailman.qth.net>;
> <"<antennaware"@>
> Sent: Wednesday, May 19, 2010 3:36 PM
> Subject: [Yaesu] Another form of eliminating ITV
>> Dear friends
>> I have heard talk about a form of eliminating ITV.
>> They say that there are some circuits that are built with reel, coax and
>> condensers
>> that they put on a lot between the equipament and the connection to 
>> earth
>> (ground) and help to eliminate the ITV.
>> Somebody can speak to me of that topic or to tell me some Web where to
>> find
>> it.
>> A million thank you in advance.
>> 73. - Eduardo. CO8LY

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