I think there was also something called "Amax"...anybody ever hear of that one? I think this is what WSM in Nashville, Tennessee was using at the time! Tom Kaufman
-----Original Message----- From: Pc-audio [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of Barry Chapman Sent: Saturday, April 05, 2014 11:21 PM To: PC Audio Discussion List Subject: Re: Stereo AM Hi Dane, >From Wikipedia: C-QUAM is the method of AM stereo broadcasting used in Canada, the United States and most other countries. It was invented in 1977 by Norman Parker, Francis Hilbert and Yoshio Sakaie, and published in an IEEE journal. Using circuitry developed by Motorola, C-QUAM uses quadrature amplitude modulation (QAM) to encode the stereo separation signal. Barry Chapman ----- Original Message ----- From: "Dane Trethowan" <grtd...@internode.on.net> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> Sent: Sunday, April 06, 2014 12:46 PM Subject: Re: Stereo AM Now a question for you, is this the Motoroller standard? If so then yes, that's the main one used in Australia. On 6 Apr 2014, at 12:41 pm, Barry Chapman <ba...@bchapman.id.au> wrote: > Yes, Australia used the C-QUAM standard for AM stereo. > > Barry Chapman > > ----- Original Message ----- > From: "Gary Schindler" <garys5...@comcast.net> > To: "PC Audio Discussion List" <pc-audio@pc-audio.org> > Sent: Sunday, April 06, 2014 11:52 AM > Subject: Re: Stereo AM > > > Maybe the Melbourne station used SeQuam like the system that was adopted in > the states. Stereo separation was pretty decent and most of the big gun > radio stations in Pittsburgh broadcast in stereo 24 7. by the late 90's > stereo AM went buy the wayside like HD AM is pretty much done around here > now. If KDKA can't make a go or looses interest in the newest form of > transmission, the others follow suit. > > ----- Original Message ----- > From: "Dane Trethowan" <grtd...@internode.on.net> > To: "PC Audio Discussion List" <pc-audio@pc-audio.org> > Sent: Saturday, April 05, 2014 8:26 PM > Subject: Re: Stereo AM > > > I think I know the Sony Walkman Stereo AM Walkman you're referring to, its > easily identifiable by the very large band switch on the face of the radio, > I used to call that Walkman the "Biscuit Radio" as the band switch reminded > me of a chocolate biscuit/cookie <smile>. > > The radio was okay though I thought the smaller Sangean Pocket model had the > edge, far better sensitivity to start with though - knowing Sangean as I > do - that's not at all surprising. > > I have a couple of Sony AM Stereo tuners though they had to be adjusted to > get decent clarity out of them, they also exhibited an annoying trait, you > could hear the 25HZ tone which tells the tuner that the signal is an AM > Stereo signal. > > The other capable Stereo AM tuner I have here is one that I had built for me > from the information supplied in the electronics magazine Silicon Chip back > in 1987. > > What I like about Stereo AM is that it can be broadcast at any time and - if > its done properly - the average consumer will not notice any interference or > odd sound from their standard Mono AM radio, some of the AM Stereo signals I > used to listen to did exhibit slight bass distortion on a Mono set but these > signals usually sounded pretty poor when listening on an AM Stereo tuner. > > The Melbourne radio station 3UZ had by far the best Stereo AM sound I've > ever heard - along with Canberra's 2CA -, I don't know what they were using > on their transmitter but even the mono signal sounded clean and crisp. > > > On 6 Apr 2014, at 5:32 am, Steve Jacobson <steve.jacob...@visi.com> wrote: > >> I had a Carver TX11 tuner that received AM stereo and also a Sony pocket >> portable that did. There is no doubt that the current HD system on AM is >> quieter and better sounding, but one has to have such a >> perfect signal that I find it pretty annoying. In addition, stations that >> use HD on AM have to restrict their analog audio bandwidth. I actually >> prefer a noisier but more reliable AM stereo system as was used here >> in the US in the 1980's. Even more, that system did not interfere with >> adjacent stations as does the HD system does now. >> >> Best regards, >> >> Steve Jacobson >> >> On Sat, 5 Apr 2014 13:09:27 -0400, Tom Kaufman wrote: >> >>> In the 90s. WSM (Nashville, Tennessee) was in AM stereo; we had an AM >>> stereo >>> system in the car (a Lincoln Town Car) I remember riding home from a gig >>> and >>> would have the Grand Ole Opry on one night; if the station would come in >>> just right, the "stereo" would kick in; it sounded great! But my first >>> experience with hearing AM stereo (again it was with WSM) we had traveled >>> to >>> Nashville; we had a Lincoln Town Car; I did not realize that the car was >>> equipped with AM stereo! We had stopped to see about getting rooms (my >>> father and I stayed in the car and WSM was on the radio. But then I >>> noticed it was in stereo, so I figured "no; that couldn't be WSM!" So >>> just >>> to confirm what I thought my ear was telling me, I asked my father to >>> tell >>> me what station the radio was on! When he said 6500, then I knew and was >>> totally amazed at how good it sounded! >>> Tom Kaufman >> >>> -----Original Message----- >>> From: Pc-audio [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of Evan >>> Reese >>> Sent: Saturday, April 05, 2014 12:59 PM >>> To: PC Audio Discussion List >>> Subject: Re: Stereo AM >> >>> Back in the 80s when I was visiting my parents in California, there was a >>> stero AM station. But I didn't have any stereo AM receivers. But I did >>> have >>> two portable radios. I discovered that if you tuned them just right, you >>> could get the stereo sound. >>> Evan >> >>> ----- Original Message ----- >>> From: "Dane Trethowan" <grtd...@internode.on.net> >>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>> Sent: Saturday, April 05, 2014 12:34 PM >>> Subject: Stereo AM >> >> >>> Back to the glory days of radio <smile>. >> >>> Actually we do have one radio station in Australia to my knowledge that >>> does >> >>> broadcast in AM Stereo to this day and that's 2CA Canberra, Here's a >>> recording I found on Youtube of a station in the U.S. though I'm not sure >>> when the content was actually aired, quite nice audio so - for those who >>> have never heard stereo AM before - take a moment to enjoy. >>> <WCTC in AM Stereo on Denon TU-680NAB> >> >> >>> ********** >> >>> Dane Trethowan >>> Skype: grtdane12 >>> Phone US (213) 438-9741 >>> Phone U.K. 01245 79 0598 >>> Phone Australia (03) 9005 8589 >>> Mobile: +61400494862 >>> faceTime +61400494862 >>> Fax +61397437954 >>> Twitter: @grtdane >> >> >> >> >> >> >> >> >> >> >> > > > ********** > > Dane Trethowan > Skype: grtdane12 > Phone US (213) 438-9741 > Phone U.K. 01245 79 0598 > Phone Australia (03) 9005 8589 > Mobile: +61400494862 > faceTime +61400494862 > Fax +61397437954 > Twitter: @grtdane > > > > > > ********** Dane Trethowan Skype: grtdane12 Phone US (213) 438-9741 Phone U.K. 01245 79 0598 Phone Australia (03) 9005 8589 Mobile: +61400494862 faceTime +61400494862 Fax +61397437954 Twitter: @grtdane
