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Shared projects
K1RF BPF.zip
by K1RF.
2
layer board of
2.51x0.71
inches
(63.65x17.93
mm).
Shared on
October 22nd, 2016 14:46.
order 3 QRP BPF with bifilar-wound I/O toroids. uses T50 toroids and 500V silvered mica caps (accommodates small and large). Ref June 1998 QST “Clean up your signals with Bandpass Filters” by Ed Wetherhold, W3NQN. These filters are bifilar L1 and L3 for ease of building.