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Message: <blockquote data-quote="jeallen01" data-source="post: 1102219" data-attributes="member: 176704">I'm guessing but I suspect that you need a coil - and thus core - that is optimised for the frequency range over which the discriminator operates.Never delved into how those work but this <a href="https://wiki.analog.com/university/courses/electronics/electronics_lab_fm_detectors" target="_blank"> page </a>seems to indicate that it might be about 300-1300Hz - if so, then you need a coil/core suitable for that range, and thus not from a superhet receiver IF filter (e.g. 455-465kHz, 10.7MHz, etc...)????</blockquote>