jakdedert wrote:
You're backpedaling.

What you clearly said was that it could not be detected without a scope.
Then you come up with a bunch of gobbledeegook about 'well designed
receivers'. That's not the point, and that's not what you said.

Suffice to say that you were simply wrong. 100 Hz is clearly audible.
It doesn't take a scope to detect. A pair of common ears is all that's
necessary. Whether it should be heard in a CB receiver is debatable,
but if it's there, there's no reason why one shouldn't be able to hear it.

To be fair, "subaudible tone" is a fairly common euphemism for CTCSS or
"PL" tones. As you point out, though, they're only "subaudible" because
they get filtered out before the final audio stages.