[Milsurplus] Radio pic and early FM

[Facility 406]

> The aviation industry deliberately passed on FM because to the "capture 
> effect."  An FM set, stuck on transmit, can block an entire channel.  
> This is bad news when your up in the air covering a large area.  On AM 
> you at least have a chance of hearing another weaker station.

I've heard this all my life.

And, living in Nevada, where stations are spread out, it's barely a thing.

My personal observations, across 2+ decades, many FM 
receivers/transceivers, it works like AM.  Hear one, hear two, or more, 
but, also like AM, when closer to a stronger one, the stronger seems to 
take over.

I can personally attest, for the FM broadcast band, 2m, and 440 MHz, 
there is little to no capture affect, just one station stronger than the 
other, and I observe it several times per week.

I also monitor airband comms, almost daily.  One can hear one, two, 
three, with varying levels of interference to each other, to completely 
blocking.  So, in this sense, AM will also "capture".

AM, FM, they work the same, strongest "captures", modulation doesn't matter.

Perhaps the "capture" thing was based on a particular model receiver, 
under certain conditions, and the notion stuck?

I tune AM/FM just the same, reception is just the same, and being in a 
sparse/rural area, it's a good thing, as I often listen to both AM and 
FM in the boonies, and on the fringe of reception.

Kurt