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: ma...@durenberger.com > To: neil...@earthlink.net; irca@hard-core-dx.com > 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" <neil...@earthlink.net> > Sent: Sunday, July 31, 2011 10:07 PM > To: "Mailing list for the International Radio Club of America" > <irca@hard-core-dx.com> > 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 <ma...@durenberger.com> > >>Sent: Jul 30, 2011 3:43 PM > >>To: Mailing list for the International Radio Club of America > >><irca@hard-core-dx.com> > >>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 > >> > >> > >> > >>_______________________________________________ > >>IRCA mailing list > >>IRCA@hard-core-dx.com > >>http://montreal.kotalampi.com/mailman/listinfo/irca > >> > >>Opinions expressed in messages on this mailing list are those of the > >>original contributors and do not necessarily reflect the opinion of the > >>IRCA, its editors, publishing staff, or officers > >> > >>For more information: http://www.ircaonline.org > >> > >>To Post a message: irca@hard-core-dx.com > >> > > > > _______________________________________________ > > IRCA mailing list > > IRCA@hard-core-dx.com > > http://montreal.kotalampi.com/mailman/listinfo/irca > > > > Opinions expressed in messages on this mailing list are those of the > > original contributors and do not necessarily reflect the opinion of the > > IRCA, its editors, publishing staff, or officers > > > > For more information: http://www.ircaonline.org > > > > To Post a message: irca@hard-core-dx.com > > > > > > _______________________________________________ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the original > contributors and do not necessarily reflect the opinion of the IRCA, its > editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com > _______________________________________________ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
