Another system which was tried was called the "Manovox" system and sorry if my spelling's wrong.
On 6 Apr 2014, at 5:56 pm, Barry Chapman <[email protected]> wrote: > 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" <[email protected]> > To: "PC Audio Discussion List" <[email protected]> > 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 <[email protected]> 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" <[email protected]> >> To: "PC Audio Discussion List" <[email protected]> >> 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 <[email protected]> wrote: >> >>> Yes, Australia used the C-QUAM standard for AM stereo. >>> >>> Barry Chapman >>> >>> ----- Original Message ----- >>> From: "Gary Schindler" <[email protected]> >>> To: "PC Audio Discussion List" <[email protected]> >>> 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" <[email protected]> >>> To: "PC Audio Discussion List" <[email protected]> >>> 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 <[email protected]> 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:[email protected]] 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" <[email protected]> >>>>> To: "PC Audio Discussion List" <[email protected]> >>>>> 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 > > > > > ********** 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
