Very interesting Stephen. I apparently don't understand FM well enough because I always thought the capture effect had to do with whichever signal was stronger, the reciever would "lock" on that one, unlike AM which is simple enough for me to understand why you can hear two signals at once.

Thanks for looking for that and sharing it.

73, John Brier KG4AKV



On Sat, May 15, 2021, 09:58 <sjdevience@gmail.com> wrote:
My guess is that the wider filter bandwidth on AO-27 makes FM capture less effective.

This thesis I found says "The simulation results establish that the lowpass filtering portion of frequency
demodulation accounts for the capture effect of FM receivers."

https://apps.dtic.mil/dtic/tr/fulltext/u2/a208479.pdf

-Stephen
N8URE

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