Thanks Dane. I'm certainly not an expert on the subject, so if you come up with something different, that's fine. I do remember some mention of the Harris system back in the 80s.
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 2:42 PM Subject: Re: Stereo AM Okay fine and I appreciate you looking this up in Wikipedia however not everything on Wikipedia is accurate, I know someone else who is well informed on this topic and - whilst I'm not disputing the standard used at all - I'm curious to know where Motorolla comes into the picture in Australia, I'll contribute what I find out to the list. On 6 Apr 2014, at 1:20 pm, Barry Chapman <ba...@bchapman.id.au> wrote: > 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 > > > > > ********** 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
