On 01/21/2018 09:15 AM, Neil Cherry via vcf-midatlantic wrote:
I seem to recall that when we hit 9600 we were no longer sending bits but rather analog that represented the bits (like 4 bits). But it also depended on the quadrature of the signal. Sorry my memory is not so good on this subject anymore. I do recall that we had to stop saying bits per second because it was no longer really bits, it was baud.
They're modems...they've *always* sent analog that represented the bits. But when you say "like 4 bits", perhaps you're referring to the phase modulation types, which can sent multiple bits simultaneously. In mainstream modems, that started with 1200 baud. That's why 300 baud sounds like a tone (which is all it is), and 1200 baud sounds like noise to human auditory perception. -Dave -- Dave McGuire, AK4HZ New Kensington, PA