Subject: Re: [Elecraft] OT: J and -31 mix toroids
> You might wish to experiment with Steward mix 35 or 40 toroids. Mix 35 > has a relative permeability of 5000 and mix 40 is 10,000. Fair-Rite's 31 > material has a relative permeability of 1500. > > Digikey carries several sizes of toroid cores in mix 35 and 40 at > moderate price. Search DigiKey's web site for 35T or 40T to see what > they have available. For example, a 1 inch OD core is $1.19 in single > lot quantities. Smaller cores, 0.54 inch OD, are 23 cents each in single > lot. > > Steward's 35 and 40 material are MnZn ferrites and will have dimensional > resonance in the HF frequency range, with the exact frequency depending > on the core dimension. I suspect that dimensional resonance won't be an > issue for a current choke at your frequency range, however. Fair-Rite > claims the 31 material, although also a MnZn ferrite, does not have > dimensional resonance. Type 43 is a NiZn ferrite and does not have > dimensional resonance in the HF frequency band. > > > Jack K8ZOA > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
