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Old 11th Apr 2020, 1:02 pm   #25
Wendymott
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Join Date: Jun 2013
Location: Huddersfield, West Yorkshire, UK.
Posts: 1,782
Default Re: 6 metre 4 pole filter

Hi Jim and others..... as it happens I guessed the sizes.. ish and I had some green Toko 5.5T formers.. only 4 sadly..so I made some formers at 6mm and wound with 20 swg but I couldnt thread the centres as I dont have any taps of that thread.. UNF I guess.. so I used poly spaced trimmers for adjustment.
I am working on the 2 metre filter at present and I am nearly there..what with coupling distance,, tuning and coupling, its like spinning plates.. trying to keep them all in the air.
I am looking at the Coilcraft data, and I think I will pre test with home made formers and then order from them.. as in RAPID supplies.
Good job this project has no time limit..
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Wendy G8BZY
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