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#303

This video describes how a Pulse Counting FM Discriminator works - it is a unique FM demodulator that doesn't require and tuned circuits like the FM Ratio Detector or Foster Seeley discriminator. It operates by measuring the changing duty cycle resulting from a series or fixed width pulses that are synchronized to the carrier, or IF frequency. Here is a link to Alan Yates' blog on a discrete FM broadcast receiver made using this technique: http://www.vk2zay.net/article/250 A link for the diode ring mixer (that I promised):    • #167: How a Diode Ring Mixer works | ...   And a copy of my show notes: http://www.qsl.net/w2aew/youtube/puls...