#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...