The capture effect is quite pronounced in older FM receivers with discriminators and ratio detectors. Newer auto FM receivers will detect two stations at once, one of my favorite stations that is thirty miles away is interfered with when atmospherics change propagation patterns. The interfering station is heard clearly with the desired one. My FM tuner that uses a discriminator will play the stronger. FM tuners and receivers were once tested and rated for capture ratio. When reliability and knowing if there are two stations transmitting at once are paramount, the older technology may still be the best.
B. Gentry, KA2IVY
I have a feeling that the capture effect is more pronounced with the old Foster-Seeley type of discriminator then with the modern phase locked loop discriminator that is used in today's FM radios. One ICs now replaces most of the old FM circuitry.
Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence. Murphy
On Thursday, July 31, 2025 at 02:57:44 AM CDT, Hubert Miller <[email protected]> wrote:
______________________________________________________________
I often "FM band dial twiddle" whilst long distance driving. I not infrequently note some unidentified distant FM bc station totally overriding for a variable period of time some also weak FM station i am listening to. AM bc stations are so well freq controlled now that if there's any audible beat, your best guess is that one station is Mexico or overseas. You can hear both audios at once. Yes, it is hard to sort out, maybe impossible, but both - or more - are in there.
Re AI - it seems that Ebay has done a good job selling it to the rubes. These glowing AI listing descriptions all sound so alike, very high BS factor.-Hue Miller
Sent from my Galaxy
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