Re: Stereo AM Confirmation
Dane, I am fairly certain that we used both in the US and that the Motorola system was slightly more common in the end, but it was never controlled as you said and that likely hurt its chances to succeed. However, FM really took off here in the 80's and 90's and that also probably hurt and may have been the biggest reason that AM Stereo didn't make it. Who knows. Best regards, Steve Jacobson On Thu, 10 Apr 2014 12:10:19 +1000, Dane Trethowan wrote: Hi! Okay, it seems that Australia used the Motoroller method for transmitting Stereo AM in the end after a battle in court over here, the U.S. apparently used the Magnavox method or the Haris method, nothing was tightly controlled by the FCC until it was far too late smile. ** 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
RE: Stereo AM
that sounds like the same attitude the FCC took we're not going to tell you how to do it but if you want to then have at it. It wasn't marketed very well over here either. Ray T. Mahorney WA4WGA -Original Message- From: Pc-audio [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of Dane Trethowan Sent: Wednesday, April 09, 2014 04:41 To: PC Audio Discussion List Subject: Re: Stereo AM Slight corrections required here smile. AM Stereo was Pushed for cars and I can tell you exactly which manufacturers were paid to put Stereo AM into their products as I was working in the car industry myself at the time, never seen so many sales brochures pertaining to one particular topic at any one time. So the manufacturers were Rover, Holden (GM) - in their Berlenia and Kellett Comodore models -, SAAB, Mercedes, Jagua, Nissan - in their Pintara and above - some rebadge Nissan cars sold by Ford, Reindriver. There are stations still broadcasting Stereo AM in Australia as I reported earlier, the one I know of is 2CA in Canberra. Stereo AM - as Barry says - never took off in Australia because the format really never had a chance to, unlike digital radio Stereo AM was never given any proper launch, all stations were told was that if they wanted to Broadcast in Stereo AM - and many did because of the financial squeeze being placed upon them by the new FM commercial stations - then they could go right ahead from February 1st 1985 and most stations were broadcasting in that format on or by that date. I know that many stations in the Melbourne area were broadcasting in this format long before February 1ST thus these stations had a head start in the game, they were able to Tweak the performance of the transmitter and equipment, experiment with the various methods of Stereo AM around at the time, gage listener feed back from myself and another person I know who I reckon were probably just about the only people who had AM Stereo sets in Melbourne at one stage of the game. The Stereo AM sets were far more expensive than other radios available and were low in stock thus consumers weren't interested, Why should I pay 5 times the price for a Stereo AM set when the FM one is cheaper and still receives AM which I don't really want to listen to anyway as it sounds dreadful on the radio I have. Then there was the court battle over which AM Stereo method should be used in Australia which - though finally resolved - didn't help matters, as mentioned earlier som manufacturers such as Sony took matters into their own hands. There were also interference issues though I never personally experienced any! in all my time of using Stereo AM sets, things were so bad in Sydney at one stage that Radio 2Uw and others wouldn't transmit in Stereo AM between 7 A.M. and 7 P.M.. Because of the expensive nature of a Stereo AM set other solutions were soon devised and they found their way onto the market. For example, you could buy a Stereo AM Converter which you tuned to the Stereo AM frequency and then the converter would transmit that received signal onto a predetermined frequency on the FM band for your car stereo to receive. The cheapest AM Stereo tuner I ever saw was one sold by radio shack, I saw it as low as $50 and it was amazingly simple but yet so amazingly affective and quality was very reasonable, I know many inghusiests still have these tuners to this day and most have had mods done on them of various kinds to make them even better. And finally, the other big problem with Stereo AM was the lack of self-contained systems such as Music Centers and the like featuring Stereo AM, Voxon was the only firm that marketed such devices. To my knowledge, the last AM Stereo unit ever made was by Sony in 1995 which marketed the 25th Anerversary Walkman model which had Am Stereo as part of it, I'm fortunate enough to own one of those sets. A new standard of Stereo AM was proposed but by the mid 90's manufacturers had given the whole idea away completely and this standard meant spending yet more money on completely new chips, I don't know the name of the standard proposed but I do know that the band width was far wider than what we had been used to up until this time. Many people dismiss Am Stereo as Rubbish but I certainly do not, with a good radio and a good signal Stereo AM sounded nearly as good - in fact some what better - than many processed FM singnals. As for music stations in Australia, there are still many that transmit on AM - in stereo or not - which still do very well: 2CH in Sydney, Magic 1278 and My MP in Melbourne, Magic 882 and 4KQ in Brisbane, Cruise 1323 in Adelaide and many other country stations, music will always be a part of AM radio in Australia because of the long distances AM is able to travel and be heard. On 8 Apr 2014, at 9:06 am, Barry Chapman ba...@bchapman.id.au wrote: This is true. However, AM stereo never really took off in Australia, other than for car
Re: Stereo AM
Dane, I note nobody has come back on the DropBox link I posted, details below: https://dl.dropboxusercontent.com/u/7644179/A.%20M.%20stereo.zip file name: A. M. stereo.zip I would have thought somebody must have heard this, so why no comments? I am interested to know what happens when a little out of the strongest signal area? Does the stereo switch on and off with different signal strengths mostly due to fading? What is the lowest useable frequency? Did anybody try stereo a.m on long wave? Just a few thoughts.
Re: Stereo AM
I haven't had a listen to your file yet, I haven't had a chance. I should think that your question regarding the stereo signal would very much depend on the method of AM Stereo used. The method used in Australia had a 25HZ tone broadcast along with the signal thus - and yep it does work - so long as the 25HZ tone was received by the detector circuit on the AM Stereo radio then the radi could receive the Stereo AM signal. I listen to Radio 2CA in Canberra without any problems, Canberra is around 300 miles away from here. On 9 Apr 2014, at 7:49 pm, Colin Howard co...@pobox.com wrote: Dane, I note nobody has come back on the DropBox link I posted, details below: https://dl.dropboxusercontent.com/u/7644179/A.%20M.%20stereo.zip file name: A. M. stereo.zip I would have thought somebody must have heard this, so why no comments? I am interested to know what happens when a little out of the strongest signal area? Does the stereo switch on and off with different signal strengths mostly due to fading? What is the lowest useable frequency? Did anybody try stereo a.m on long wave? Just a few thoughts. ** 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
Re: Stereo AM
The recording is interesting. This recording does show AM stereo's capabilities, but I have heard better audio from receivers using a wider bandwidth, and of course this recording is getting some adjacent channel interference as well which would make a wider bandwidth less effective. While long distance stereo here in the United States was fun, its most useful application in my opinion was on strong and medium strength AM signals during the day where a wider bandwith is practical. That could really sound pretty good. How AM stereo is handled when a signal is weaker is really a function of the receiver being used. I found that less noise was added when a weak AM signal was in stereo than was the case with a weaker FM signal. Fading also affected the stereo image as was shown in this recording. Both the Sony Walkman style radio and my Carver tuner went into stereo at very low signal levels. In my experience here in the US, I cannot say that AM stereo caused additional interference. Stations that used a wider bandwidth for greater fidelity would, of course, cause more interference, and there was a tendency for AM stereo stations to want increased fidelity as well, but I didn't notice more interference from the stereo process itself, nothing like HD radio now. It is interesting that AM stereo is still being used in some areas. Best regards, Steve Jacobson On Wed, 09 Apr 2014 10:49:05 +0100, Colin Howard wrote: Dane, I note nobody has come back on the DropBox link I posted, details below: https://dl.dropboxusercontent.com/u/7644179/A.%20M.%20stereo.zip file name: A. M. stereo.zip I would have thought somebody must have heard this, so why no comments? I am interested to know what happens when a little out of the strongest signal area? Does the stereo switch on and off with different signal strengths mostly due to fading? What is the lowest useable frequency? Did anybody try stereo a.m on long wave? Just a few thoughts.
Stereo AM Confirmation
Hi! Okay, it seems that Australia used the Motoroller method for transmitting Stereo AM in the end after a battle in court over here, the U.S. apparently used the Magnavox method or the Haris method, nothing was tightly controlled by the FCC until it was far too late smile. ** 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
Re: Stereo AM
Slight corrections required here smile. AM Stereo was Pushed for cars and I can tell you exactly which manufacturers were paid to put Stereo AM into their products as I was working in the car industry myself at the time, never seen so many sales brochures pertaining to one particular topic at any one time. So the manufacturers were Rover, Holden (GM) - in their Berlenia and Kellett Comodore models -, SAAB, Mercedes, Jagua, Nissan - in their Pintara and above - some rebadge Nissan cars sold by Ford, Reindriver. There are stations still broadcasting Stereo AM in Australia as I reported earlier, the one I know of is 2CA in Canberra. Stereo AM - as Barry says - never took off in Australia because the format really never had a chance to, unlike digital radio Stereo AM was never given any proper launch, all stations were told was that if they wanted to Broadcast in Stereo AM - and many did because of the financial squeeze being placed upon them by the new FM commercial stations - then they could go right ahead from February 1st 1985 and most stations were broadcasting in that format on or by that date. I know that many stations in the Melbourne area were broadcasting in this format long before February 1ST thus these stations had a head start in the game, they were able to Tweak the performance of the transmitter and equipment, experiment with the various methods of Stereo AM around at the time, gage listener feed back from myself and another person I know who I reckon were probably just about the only people who had AM Stereo sets in Melbourne at one stage of the game. The Stereo AM sets were far more expensive than other radios available and were low in stock thus consumers weren't interested, Why should I pay 5 times the price for a Stereo AM set when the FM one is cheaper and still receives AM which I don't really want to listen to anyway as it sounds dreadful on the radio I have. Then there was the court battle over which AM Stereo method should be used in Australia which - though finally resolved - didn't help matters, as mentioned earlier som manufacturers such as Sony took matters into their own hands. There were also interference issues though I never personally experienced any! in all my time of using Stereo AM sets, things were so bad in Sydney at one stage that Radio 2Uw and others wouldn't transmit in Stereo AM between 7 A.M. and 7 P.M.. Because of the expensive nature of a Stereo AM set other solutions were soon devised and they found their way onto the market. For example, you could buy a Stereo AM Converter which you tuned to the Stereo AM frequency and then the converter would transmit that received signal onto a predetermined frequency on the FM band for your car stereo to receive. The cheapest AM Stereo tuner I ever saw was one sold by radio shack, I saw it as low as $50 and it was amazingly simple but yet so amazingly affective and quality was very reasonable, I know many inghusiests still have these tuners to this day and most have had mods done on them of various kinds to make them even better. And finally, the other big problem with Stereo AM was the lack of self-contained systems such as Music Centers and the like featuring Stereo AM, Voxon was the only firm that marketed such devices. To my knowledge, the last AM Stereo unit ever made was by Sony in 1995 which marketed the 25th Anerversary Walkman model which had Am Stereo as part of it, I'm fortunate enough to own one of those sets. A new standard of Stereo AM was proposed but by the mid 90's manufacturers had given the whole idea away completely and this standard meant spending yet more money on completely new chips, I don't know the name of the standard proposed but I do know that the band width was far wider than what we had been used to up until this time. Many people dismiss Am Stereo as Rubbish but I certainly do not, with a good radio and a good signal Stereo AM sounded nearly as good - in fact some what better - than many processed FM singnals. As for music stations in Australia, there are still many that transmit on AM - in stereo or not - which still do very well: 2CH in Sydney, Magic 1278 and My MP in Melbourne, Magic 882 and 4KQ in Brisbane, Cruise 1323 in Adelaide and many other country stations, music will always be a part of AM radio in Australia because of the long distances AM is able to travel and be heard. On 8 Apr 2014, at 9:06 am, Barry Chapman ba...@bchapman.id.au wrote: This is true. However, AM stereo never really took off in Australia, other than for car radios, although a number of stations either did or still do use it. I don't actually own an AM stereo receiver. These days in Australia, most of the music stations are on FM while the AM band is mainly for talk stations. In the capital cities where digital radio exists, all the major AM and FM stations simulcast in digital stereo, along with other digital only stations. Barry
Re: Stereo AM
Hi! But why in the world use AM at all? Just curious as i live in Sweden where we don't have much radio stations running. Those who run runb on fm. /A 6 apr 2014 kl. 05:20 skrev Barry Chapman ba...@bchapman.id.au: 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
RE: Stereo AM
I think it's important if you want to broadcast long distance, especially in countries like the USA, Canada or Australia where there are people who don't live in the range of many FM stations. Alexandra -Original Message- From: Pc-audio [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of Anders Holmberg Sent: Monday, April 07, 2014 6:32 PM To: PC Audio Discussion List Subject: Re: Stereo AM Hi! But why in the world use AM at all? Just curious as i live in Sweden where we don't have much radio stations running. Those who run runb on fm. /A 6 apr 2014 kl. 05:20 skrev Barry Chapman ba...@bchapman.id.au: 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
Re: Stereo AM
On 06/04/2014 13:28, Colin Howard wrote: Greetings, I have absolutely no idea what system is being used in the files, DropBox link for which is below, all I can tell you it in the UK A.M stereo has never taken off, I am unaware what, if any serious experiments have been carried out over here. Only one; in the 1980s Radio Orwell carried stereo programmes on its MW transmitter at Foxhall Heath on 255m, using the Motorola C-QUAM system. Nothing came of the experiment; I seem to remember that there were problems of interference as the stereo signal was wider than normal. -- rgds LAurence ...Keyboard not found, think F1 to continue. ---Taglines by Tagzilla (tagzilla.mozdev.org)
Re: Stereo AM
This is true. However, AM stereo never really took off in Australia, other than for car radios, although a number of stations either did or still do use it. I don't actually own an AM stereo receiver. These days in Australia, most of the music stations are on FM while the AM band is mainly for talk stations. In the capital cities where digital radio exists, all the major AM and FM stations simulcast in digital stereo, along with other digital only stations. Barry Chapman - Original Message - From: Alexandra Grünauer al.gruena...@gmx.de To: 'PC Audio Discussion List' pc-audio@pc-audio.org Sent: Tuesday, April 08, 2014 2:44 AM Subject: RE: Stereo AM I think it's important if you want to broadcast long distance, especially in countries like the USA, Canada or Australia where there are people who don't live in the range of many FM stations. Alexandra -Original Message- From: Pc-audio [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of Anders Holmberg Sent: Monday, April 07, 2014 6:32 PM To: PC Audio Discussion List Subject: Re: Stereo AM Hi! But why in the world use AM at all? Just curious as i live in Sweden where we don't have much radio stations running. Those who run runb on fm. /A 6 apr 2014 kl. 05:20 skrev Barry Chapman ba...@bchapman.id.au: 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
Re: Stereo AM
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
Re: Stereo AM
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 ba...@bchapman.id.au 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 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
Re: Stereo AM
Greetings, I have absolutely no idea what system is being used in the files, DropBox link for which is below, all I can tell you it in the UK A.M stereo has never taken off, I am unaware what, if any serious experiments have been carried out over here. The archive file, link for which is below, contains two .mp3s, one is a report given on the date indicated by the file name, the other, is a recording made of the A.M. stereo service named, in the location indicated,at the time and date specified in the file name. Please be aware the recordings, at a rather low sampling rate, are somewhat over-modulated but ought to give some idea. I know only what is in the recordings therefore cannot make any further comments. I will only leave this file on Dropbox until Thursday next, 2014/04/10 at mid day UK time, as I do not have much disk space left with which to work. File Name: A. M. stereo.zip File Size: 6.23 MB (6,541,248 bytes) DownLoad Link: https://dl.dropboxusercontent.com/u/7644179/A.%20M.%20stereo.zip -- Patience is a virtue, possess it if you can, seldom found in women, never found in man.
RE: Stereo AM
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
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
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
RE: Stereo AM
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
Re: Stereo AM
Yep, that's how I used to do it back in the 80s, was a Teenager then and had no buying power smile., its a crewed way of doing it but it did work to an extent. Of course, that procedure you outlined very much depended on the method of broadcasting Stereo AM. On 6 Apr 2014, at 2:58 am, Evan Reese ment...@dslextreme.com wrote: 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
RE: Stereo AM
Hi Dane, Thanks for that information. I didn't know that there was stereo am. Could you please post the direct link because all I found via google was a guy introducing a stereo am tuner, announcing that he would play it and then stopping after a quite boring show of unwrapping the thing: http://www.youtube.com/watch?v=25tOtuERp2w Take care Alexandra -Original Message- From: Pc-audio [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of Dane Trethowan Sent: Saturday, April 05, 2014 6:34 PM To: PC Audio Discussion List 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
RE: Stereo AM
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
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
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
Re: Stereo AM
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
Re: Stereo AM
That wasn't always the case, there was a battle in court at some point there over what method was to be used, Sony was one of those company's that was absolutely sick and tired of the whole Method argument so they made their own systems whereby the user could either Switch methods depending on the one used or - in later models - the set would detect the method automatically. For a while in Australia the ABC was using the Haris method. 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
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
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
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
