On 5/6/2014 12:05 PM, Dan Atchison via TowerTalk wrote: > I'm making RF chokes out of 2.4" ferrite cores, mix 43 and mix 31 > material. Is there a maximum limit to the amount of ferrite I should > use? Yes. Study k9yc.com/RFI-Ham.pdf For winding guidelines for each ham band or group of bands, see the Choke Cookbook. 73, Jim K9YC