Uploaded August 2019 | Updated September 2026, 2 weeks ago
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:
vk2zay.net/article/250
A link for the diode ring mixer (that I promised):
youtube.com/watch?v=junuEwmQVQ8
And a copy of my show notes:
qsl.net/w2aew/youtube/pulse_counting_fm_demod.pdf
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:
vk2zay.net/article/250
A link for the diode ring mixer (that I promised):
youtube.com/watch?v=junuEwmQVQ8
And a copy of my show notes:
qsl.net/w2aew/youtube/pulse_counting_fm_demod.pdf
