60m band filter.

"andyfoad@..." #1296 Just been playing here with a design for the 60m band which may be of use to U2'ers, or Hans if he's requiring a 60m LPF design. Take one of the 80m LPF's. L1 = 23 TURNS (WAS 25) L2 = 24 TURNS (WAS 27) L3 = 23 TURNS (WAS 25) Change C1 and C4 change to 680pf C2 and C3 remain at 1200pf. So all you really need in terms of new components are 2 x 680pf caps! 1st harmonic is -58db down 2nd harmonic is -79db down 73 de Andy G0FTD
Hans Summers #1298 Hi Andy Luckily, I have 680pF caps! They are used in the 40m kit. So I will put together some kits for a 60m LPF and add them to the range! Thanks! 73 Hans G0UPL toggle quoted message Show quoted text On Sun, Jun 2, 2013 at 7:49 PM, andyfoad@... <andyfoad@...> wrote: ? Just been playing here with a design for the 60m band which may be of use to U2'ers, or Hans if he's requiring a 60m LPF design. Take one of the 80m LPF's. L1 = 23 TURNS (WAS 25) L2 = 24 TURNS (WAS 27) L3 = 23 TURNS (WAS 25) Change C1 and C4 change to 680pf C2 and C3 remain at 1200pf. So all you really need in terms of new components are 2 x 680pf caps! 1st harmonic is -58db down 2nd harmonic is -79db down 73 de Andy G0FTD

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