Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!floyd!harpo!decvax!ittvax!ittral!shacklet
From: shacklet@ittral.UUCP (Cliff Shackleton)
Newsgroups: net.audio,net.ham-radio,net.misc
Subject: AM Stereo
Message-ID: <356@ittral.UUCP>
Date: Mon, 30-Jan-84 11:47:37 EST
Article-I.D.: ittral.356
Posted: Mon Jan 30 11:47:37 1984
Date-Received: Wed, 8-Feb-84 04:46:39 EST
Lines: 31







     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).