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#4
December 5th 03, 10:10 PM
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Assuming that core is mostly air... this would be ~ 18 uH
rob34 wrote: rob34 wrote: I have a big roller inductor made by E.F.Johnson model 226-5. It would make a great coil for the homebrew linear as it could easily take 5kw and has enough inductance for 10 through 80 meters. It is a beautiful silver plated coil in excellant shape that measures 13.5 inches from one end of the shaft to the other and the coil is 3.5 inches in diameter. It measures 8.5 inches from end to end of the insulated plates which holds the coil itself. Very heavy duty construction, just a little too big for my needs. You can go to this website to see pictures on it: http://photos.yahoo.com/rob34115 and look at Rob`s photos. There are three pictures of it and some electrolytic caps and parts for a HV power supply I am selling. Please make me a reasonable offer on these items! WB8VWI Rob As can be seen from the pictures there is 14 turns at 3.5 inches in diameter which is more than enough inductance for 10-80 meters. I am not sure what the actual inductance is, you might be able to go to a website with the model number and get the exact specs. WB8VWI Rob |
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