Re: Low pass filter advice #vfo #40m #80m

Alan G4ZFQ

The amplitude doesn't vary much from about 4 to about 9 MHz then it shoots up and peaks at 9.2 MHz then rapidly falls off and is almost fully suppressed by about 10 to 11 MHz.

Your description makes me wonder about the technique you used.
A LPF is flat until it begins to reject HF. There is no peak.

73 Alan G4ZXF

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