bandpassfilters


Original design by W3NQN

Ferrite rings,Capacitors en Copperwire Case and manual

Now that we have everything together let's build some filters

Testing parallel circuit on 40 meters, quadrifilare winding

10 meter filter done building 15 meter filter Testing 15 meter filter
You notice that the filter's SWR is 1:1 on 21,4013 MHz, after closing the tin case it goes exacly to 21,250 MHz

Overview of the filters (case open)

Overview of the filters (case closed)

made by PA0GJV