We built a Low Pass Filter for 20-meter H.F. band which is used in BITX designed by our good friend Farhan (VU2ESE). The inductor coil is made by using 9-turns of 22-S.W.G. on a Teflon former. This L.P.F. worked beautifully and was tested with R.C.T. HP 8920A. We fed only -7db to take care of mismatch.
Below we have included the picture of the circuit we constructed in the RnD Lab. Also we have included the schematic for home-brewing purpose.
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