Thanks All Sean, I have at least 3 printed opies of W1HIS's pdf and I totally forgot that was in the back. It was that article that made me a choke everything convert.
Hence the reason I have been buying some fleamarket chokes. Brian, I tried a jig where I would wrap about 8 turns of wire around the choke and then sweep it with the SpecA and see how many db of attenuation I got. I did get results, but I could not confirm if they were accurate. thanks, mike On Wed, May 31, 2017 at 10:16 PM, Sean Waite <wais...@gmail.com> wrote: > W1HIS talks about how to identify ferrites in appendix 1 of this doc: > http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf > > -Sean WA1TE > > On Wed, May 31, 2017 at 9:51 PM Michael Walker <va...@portcredit.net> > wrote: > >> This group is clearly one of the most technical groups around and if this >> off topic enough, please kill it. >> >> The question is that if you have a box of ferrites with no labels on them, >> how could you measure their ability to be used as a choke. Yes, you could >> measure them and look them up assuming they came from one vendor. >> >> You have the usual ham tools plus a spectrum analyzer with a tracking >> generator. >> >> Does anyone have a tried and true method for determining what their >> choking >> impedance might be? >> >> Mike va3mw >> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband >> > _________________ Topband Reflector Archives - http://www.contesting.com/_topband