Hi Charlie, You are right, and you can thank Jim, K9YC for that. I used 14 turns of CAT5 on a 2.4" OD #31 ferrite core, per his suggestion. Photo attached.
Out of all the info I have ever read on ferrite materials and common-mode chokes --either in print or on the Web-- Jim's info at http://audiosystemsgroup.com/RFI-Ham.pdf has been the most valuable to me. 73, Mike www.w0btu.com On Wed, May 22, 2013 at 12:34 AM, Charlie Cunningham < [email protected]> wrote: > I would think 31 material would be great for RF control and suppression on > things like CAT5 cables, telephone circuits, audio circuits etc.! > > Regards, > Charlie, K4OTV > > > -----Original Message----- > From: Topband [mailto:[email protected]] On Behalf Of Mike > Waters > Sent: Wednesday, May 22, 2013 1:01 AM > To: topband > Subject: Re: Topband: Thanks! > > That's true, but 31 material is the closest thing I've come to a "magic > cure" here, for several applications in the past year! :-) > > It's the ONLY material that kept 75 meter RF from getting into my shack > computer's CAT5 LAN cable (etc.), and it worked perfectly as a choke balun > on a G5RV-type antenna I experimented with last year. > > 31 almost ought to be one of the definitions of "magic" in the dictionary. > :-) > > 73, Mike > www.w0btu.com > > On Tue, May 21, 2013 at 9:07 PM, Tom W8JI <[email protected]> wrote: > > > > > 31 isn't a magic cure-all, ... > > All good topband ops know how to put up a beverage at night. _________________ Topband Reflector
