ATV theory
 

I have a question in regards to the theory of ATV.

If I were to run a video signal straight into, say, a 70cm transmitter
(staying within the linear range of the transmitter's input, i.e. not
clipping) and had a receiver that had a video out / TV connected to
the reciever's output (and could adjust the amplitude of the output
signal), would that work?

Or do most "standard" (audio) transmitters/receivers have limitations
about the maximum frequency they can modulate/de-modulate? It seems
to me that the latter would be the only reason that ATV equipment
would be nessesary. Or is there some other reason this scenario would
not work?

On a side note, what's the lowest carrier frequency ATV can operate on
before the video signal degrades or begins aliasing?

Thanks in advance for any information!
Dave