AM Stereo - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th July 2010, 06:09 AM   #1
ervinl is offline ervinl  Indonesia
diyAudio Member
 
Join Date: Mar 2010
Default AM Stereo

Hi,

I am curious about AM stereo. Some AM broadcast station claims "Stereo" for its AM. What kind of AM encoding currently used and available? I would like to find receiver/tuner for this.

Previously I heard such as Denon TU-680 and 1500 support this, but now it is no longer produced. One of Marantz tuner available is ST6001, not sure if it support C-Quam. Most product available is receiver (for home audio).

What current brand/type that has AM stereo encoding, and what kind of encoding? Or is AM stereo obsolete, so that few manufacturer create such product?

Thanks,

Ervin L
  Reply With Quote
Old 26th July 2010, 03:09 PM   #2
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
I think it is a mostly abandoned format - it didn't get great public acceptance. There were about 5 competing formats in the early 1980s. There are probably still a few stereo broadcasts, but it's not really widely used anymore.
__________________
Steerpike's Toybox

Last edited by Steerpike; 26th July 2010 at 03:14 PM.
  Reply With Quote
Old 26th July 2010, 09:53 PM   #3
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
The new thing at least in the US is "HD" AM or FM digital radio.
The "HD" stands for Hybrid Digital not High Definition.
__________________
Kevin
  Reply With Quote
Old 26th July 2010, 11:31 PM   #4
Banned
 
Join Date: Jan 2008
Blog Entries: 2
If you google 'AM stereo' you will find some details of C-QUAM and the Kahn (independent sideband) modulation schemes.

w
  Reply With Quote
Old 27th July 2010, 09:37 AM   #5
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
Some Chrysler car radios supported AM stereo; a friend had one in his K-car. Not exactly current, but if they haven't all been crushed, they should be cheap.

AM stereo tuners may be better than the average AM tuner, since IIRC they used synchronous detection.
  Reply With Quote
Old 27th July 2010, 10:05 AM   #6
ervinl is offline ervinl  Indonesia
diyAudio Member
 
Join Date: Mar 2010
Can you mention some current AM stereo tuner to compare? (e.g. Marantz, Denon, Yamaha, Sherwood, Sony etc)? I can't find detail of information in the website. Just curious if it still exists and affordable (as there are some AM stations which claim as stereo around my region).

Thanks,

Ervin L
  Reply With Quote
Old 27th July 2010, 01:04 PM   #7
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
I have a Kenwood KT900, (around 1983) that was supposed to come with an optional stereo decoder box - which Kenwood never finally produced.
The stereo decoder picks off the 450kHz AM-IF signal.
I did buy a Motorola MC13020 decoder chip to add stereo myself, but then the format lost support and there didn't seem, much point to pursuing the project.
__________________
Steerpike's Toybox
  Reply With Quote
Old 29th July 2010, 09:24 AM   #8
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
I doubt there's any AM stereo tuners in current production, except possibly in some specialized all band all mode communications receiver.

Car radios can have higher performance tuners than most home stereo receivers, because they have to work under more arduous conditions of reception, temperature, and vibration. And auto manufacturers had a captive market, so they weren't forced to make as many cost saving compromises.

Make a list of as many different car and home or portable AM stereo tuners as you can find evidence of, then set up a saved search on eBay. Or contact autowrecking yards and say you're looking for a certain car radio. Of course, if your country uses a different AM band range or station spacing than North America, an imported digital AM tuner may not work so well.
  Reply With Quote
Old 29th July 2010, 01:18 PM   #9
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
You can only receive what is being broadcast. No US AM stations are now transmitting analog stereo, some are transmitting digital stereo. The digital part of a tuner only works if the station is transmitting a digital signal. The tuner will switch back to analog if the digital signal is too weak. As digital needs a stronger signal than analog.
__________________
Kevin
  Reply With Quote
Old 30th July 2010, 03:36 AM   #10
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Default AM wasteland

Just to understand why AM stereo disappeared, the US AM band is now 99% talk radio. Lots of call in shows where people that can't figure out how to work the internet talk on the air. No benefit to hearing your local self-appointed "expert" on a mono-phone line broadcast in stereo. Pity, I used to enjoy listening to certain classy "clear channel" AM stations late at night all across the nation. KRLD AM Dallas and their classical program is one I particularly miss, as 1/3 the nation is totally "Country Music" and hog market reports on the FM band now. And you can't get satelite radio unless you get a credit card from one of the two too-big-to-fail banks, BankAmerica or Citibank and agree to donate money until they decide to let you go. Oh, well, at least CD's don't melt in the car, although thieves are particularly attracted to them even if they are classical and unsaleable.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Novice stereo subs project with stereo amp. PJeff Subwoofers 70 28th August 2011 06:48 PM
Stereo in/multiple Stereo outs Circuit MartinByrne Everything Else 3 7th May 2009 01:11 AM
Reprocessed for stereo, Rechanneled for stereo and Duophonic oldheathkitphil Analog Line Level 3 29th February 2008 01:20 PM
2 Stereo in's, 2 Stereo out's, USB DAC djd4n Digital Source 13 28th August 2004 02:23 PM
How do I wire stereo headphones on a stereo tv? hike1 Everything Else 2 10th September 2001 02:22 AM


New To Site? Need Help?

All times are GMT. The time now is 09:13 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2