#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:
www.vk2zay.net/...
A link for the diode ring mixer (that I promised):
• #167: How a Diode Ring...
And a copy of my show notes:
www.qsl.net/w2a...