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Sunday, 18 February 2018


Had these in the workshop for a while and thought was time to make then up.

Basically Butterworth band-pass filters for 80m, 40m, 30 and 17m.

Used T80-6 torroids and 500V (I think) SM caps.

Should be good to 20W at least, probably a lot more.

The 80m and 40m ones I used thin wire in the winding so probably not good for higher powers, the 30m and 17m ones used 16SWG wire should should be good for 100W

1 comment:

M1KTA said...

Yes I know not the greatest ever but >-20dB on harmonics and I am QRP op so should be fine. I know 20m missing... making that one up.