Re: [IRCA] More on noise suppression

[Chuck Hutton <charlesh3@xxxxxxx>]

I would not recommend using RG58 to wind a choke. You just can't get enough turns of RG58 (even with a big core) to make a good choke. That's why receiving applications usually use a box with connectors, a big core, and have windings made with a small coax such as RG187, 188 or 316. You'll easily get 3 times as many turns and therefore 9 times the impedance. Unless you live on top of a silver, copper or gold mine you'll get a lot of benefit from the higher impedance.
 
Chuck
 

> From: Mark4@xxxxxxxxxxxxxxx
> To: neilkaz@xxxxxxxxxxxxx; irca@xxxxxxxxxxxxxxxx
> Date: Mon, 1 Aug 2011 08:38:00 -0500
> Subject: Re: [IRCA] More on noise suppression
> 
> Photo sent off-line. It's really easy to do if you have the right size 
> rings (as id'ed below) and your connectors aren't too big.
> 
> Regards,
> 
> Mark Durenberger
> 
> --------------------------------------------------
> From: "neilkaz" <neilkaz@xxxxxxxxxxxxx>
> Sent: Sunday, July 31, 2011 10:07 PM
> To: "Mailing list for the International Radio Club of America" 
> <irca@xxxxxxxxxxxxxxxx>
> Subject: Re: [IRCA] More on noise suppression
> 
> > Please forgive my ignorance here as I remain quite confused. How does one 
> > wind rather thick coax or CAT5 around small toroid rings. A picture or 
> > link will be worth a thousand words here.
> >
> > http://www.dxing.info/equipment/coax_leadin_bryant.pdf is an article where 
> > Dr. Bryant (RIP old friend) was able to make a choke winding tiny coax 
> > many turns, but I can't see how this is possible with something link RG58 
> > unless I don't understand how to make a choke.
> >
> > Following Dr. Bryant's guidelines, I unhooked my BOG from the xfmr and was 
> > getting S5 to S6 on the super strong close Chicago superpowers and a few 
> > semi-locals also were still audible, some barely moving the S-meter. So I 
> > have some work to do.
> >
> > 73 KAZ
> >
> >
> > -----Original Message-----
> >>From: Mark Durenberger <Mark4@xxxxxxxxxxxxxxx>
> >>Sent: Jul 30, 2011 3:43 PM
> >>To: Mailing list for the International Radio Club of America 
> >><irca@xxxxxxxxxxxxxxxx>
> >>Subject: [IRCA] More on noise suppression
> >>
> >>Here's a paper that Fair-Rite publishes on core materials. It's pretty 
> >>much
> >>agreed that their Material # 31 is overall best for MW/SW noise 
> >>suppression.
> >>The recommended toroid rings are Fair-Rite # 2631803802. An effective 
> >>noise
> >>choke can be realized with 9 to 14 turns of the lead-in (coax or Cat 5)
> >>wound around 5 of these toroid rings.
> >>
> >>http://www.fair-rite.com/newfair/pdf/CUP%20Paper.pdf
> >>
> >>
> >>Regards,
> >>
> >>Mark Durenberger
> >>
> >>
> >>
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