Hi Tod! Thanks for the data. I'd like to build up several toroid chokes for 160, 80 and 40 meter use. I looked at the Fair-Rite site, no 31 material. I looked at their vendors and went to Amidon ...a
Lloyd Take a look at this: http://www.ifwtech.co.uk/g3sek/in-prac/ and this: http://www.ifwtech.co.uk/g3sek/in-prac/inpr1005_ext_v2.pdf I have built a 3-band choke based on his design, and it works v
A year or two ago, based on the experience of some hams in the UK who found Fair-Rite cores either impossible to obtain or very expensive, I did some more experimental work that resulted in designs f
Hi Lloyd, Unless the type F material is far more effective than 31 material, why pay $20 each? Mouser has the Fair-Rite 2.4" #31 core for $7 each. That is the lowest price I have found for small quan
Did you open up a Cushcraft balun to discover that method? I believe some other companies do similar and Teflon wire is used so it doesnt char as does THNN. Carl KM1H ________________________________
There are baluns and there are common mode chokes. I'm talking about common mode chokes. Some so-called "current baluns" are really common mode chokes. Some baluns are wired as auto-transformers, so
Paul N1BUG said : Mouser has the Fair-Rite 2.4" #31 core for $7 each. That is the lowest price I have found for small quantities. -- Last week I purchased the 2.4" O.D. 31 mix cores (Fair-Rite part n
"These methods" are well documented in the literature, especially Jerry Sevick's work (W2FMI). In one of his later books, he discussed some chokes wound with THHN, noting that their Zo was on the ord
OR, if the choking need location NECESSARILY has a lot of voltage to block, and then perhaps a bifilar-isolation transformer wound on a low-mu powdered iron toroid (#2 ideally) would be better. I ha
With Sevick you had to wait an edition or two until he made corrections to some of his "assumptions". There was also a series in CQ that were often questionable. There would often be long discussions