From    : JMS
Subject : 

1. FM stations are geared to broadcast stereo signals.
The listener can by adjusting rt left controls can receive each broadcast
seperately. There are many occasions for ex on a sports cast that two teams
in two different arenas are battling it out for a coveted prize. Listeners
are obliged to switch from station to station to keep up.
With a FM capable of broadcasting stereo you can send two different signals.l
Also on talk shows on channell of the stereo spectrum can signal the current
talk show and the other a different talk show. two for the prioce of one .
Or the same talker can send "the best of" over his other channel.
I don't know the tecknigues of tv broacast signals but I bet you can send two
signals over the same channel in diffeent contrast and the receiver by
manipulating the contrast knob could pick them up.
2. Can a time signal be sent over the airwaves that automatically  sets clocks
with radios to the correct time ?
3.  Many listeners are slaves of certain talk shows be it Howard Stern or
 sports stations - WFAM. Would it not be a great promotional gimmick for a
Stern to give to his listeners a small rado that receives only his wave
lenght ?  Would a radio with only one wave lenght be relatively cheaper to
produce and thus be a practical giveaway ?