shacklet@ittral.UUCP (Cliff Shackleton) (01/30/84)
I recently heard a demo of the motorola AM stereo sys-
tem (CQUAM) at the winter CES show. It was
impressive,however they had their own transmitter; I don't
know if they were operating at legal bandwidth.
They were promoting the fact that they were the system
chosen by DELCO and had an Olds Cutlass set up as a listen-
ing room.
The preferred bandwidth response of the receiver is 10
KHz but the demo units had a wide and narrow bandwidth
switch on them to accommodate stations broadcasting a preem-
phasized signal.
The People at the display were very helpful and in fact
gave me data sheets on their decoder IC (MC13020) and two
samples of the part to boot!
I have not built up the circuit yet (I am trying to
scrounge up a 3.64 mHz ceramic resonator) but do have two
stations in the Raleigh area broadcasting the signal.(WCHL
Chapel Hill and WSOC Charlotte). I am planning to contact
them to find out what kind of response they have been
getting.(For all of you in other areas,Motorola has a list
available of stations broadcasting CQUAM).