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AM Stereo Sound

MarioMania said:
On my Laptop, I want to Mimic the AM stereo sound..Is there a way to do that??

I never had a AM Stereo Radio, Only Mono

For the most part, AM Stereo sounded like FM Stereo, but "warmer" - like through a tube amp. And not quite as much high end processing. I don't know if that gives you any hints. But it's not easy to explain (you had to have been there....)

There's an MP3 of KFRC's final days as a CHR in 1986 recorded in AM Stereo floating around the internet.

But here's a few off YouTube

http://www.youtube.com/watch?v=9_5QTkGEflQ&feature=related
 
From the mid 1980's through to the mid 1990's, KMOX-AM, St. Louis presented Blues hockey and Cardinal baseball in AM Stereo, and it sounded fantastic! It was properly miked, with a proper mix of PXP and ambient sound that sounded like you were actually in The Arena, Kiel (now Scottrade) Center or Busch Stadium II (the 1966-2007 ballpark).

My late dad bought a new 1986 Chrysler Imperial...which I still have and occasionaly drive, it's in excellent condition...with the Chrysler FM/AM Stereo Cassette radio 8-speaker system that still works and sounds as good as new, particularly when you find the odd AM that still has the stereo pilot on, or even rarer, still transmits in Stereo.
 
Maybe 25 years ago on the show "From the Recording Horn", I heard an FM stereo broadcast of
a late 1930s experimental stereo 78 RPM recording of a symphony. That was a real trick-or-treat on the ears.

I liked the sound of AM stereo very much.
Never looked hard enough to buy one back in the day when they were out there, and I really don't like radios
that tune in steps, for a number of reasons. So I've never owned one.

AM response still does not cut off at 10 khz today on quite a few stations.
After I put -42 db notch filters for 10 Khz on my radios, it became quite easy to hear real upper end response that
on the best stations may go to 13khz.
Of course, first you'd have to start out with a AM radio that has audio response past 10 khz.

I heard the one of the KMOX Cardinals games in stereo and it was a fantastic stereo image and balance of sound.
 
borderblaster said:
To my ears, AM stereo just sounded like AM with 2 channels. Which it was.

And good AM transmitters could easily go out to 15 kHz. In fact, the original reason for extending the AM band into the 1500's was to allow HiFi stations like WQXR.

AM stereo sounded very good. But it was too late... (thanks Leonard!)
 
borderblaster said:
To my ears, AM stereo just sounded like AM with 2 channels. Which it was.

Same here. I defer to those radio pros who know about the science of sound and broadcasting. I know nothing, but I know what my ears told me.

I got a high-end AM/FM Stereo radio for my 16th birthday in 1968, before AM Stereo was introduced. Both AM and FM sounded great, but FM sounded better. The FM Stereo stations sounded best, but there were also a lot of FMs in that era that had not yet converted to stereo. The FM Mono stations still sounded better than AM. I'd hear a song on KRLA or KHJ, then again on the nearest equivalent to Top 40 on FM in those days.... KHJ-FM or KGBS-FM probably, which were automated "chicken" rock stations. To my ears, the fidelity was clearly superior on FM.
 
musiconradio.com said:

Somehow, the Japanese have always had an affinity for the high-end of the audio spectrum. Japanese import CDs and vinyl from the '80s especially demonstrate this. It comes as no surprise that their AM Stereo would be no exception. Plus they are far more advanced technically (and patient enough) to make it all work.

If I'm not mistaken, Japanese AM radio stations were mandated to broadcast in AM Stereo - and still do.
 
Bongwater said:
Somehow, the Japanese have always had an affinity for the high-end of the audio spectrum. Japanese import CDs and vinyl from the '80s especially demonstrate this. It comes as no surprise that their AM Stereo would be no exception. Plus they are far more advanced technically (and patient enough) to make it all work.

If I'm not mistaken, Japanese AM radio stations were mandated to broadcast in AM Stereo - and still do.

There are far fewer stations per person in Japan, with a large number of 100 to 500 kw powerhouses and all are non-directional. No high-Q antenna tuners due to directionality, no need to engage in modulation wars. NHK owns about a third of the roughly 400 AMs. The lower power stations (about 200 1 kw or less) are community stations or fill for the big stations.

The US has about 5000 AMs for 300 million population. Japan has around 400 for 130 million. With no band crowding, plus being an archipelago with no surrounding countries with stations to interfere, the situation is very different in Japan. Their model is much more like Canada, not the US and shouldn't be compared with the US... starting with the high percent of government stations.
 
And good AM transmitters could easily go out to 15 kHz. In fact, the original reason for extending the AM band into the 1500's was to allow HiFi stations like WQXR.

Along those lines but years later there was an unscoped recording of WQXR's successor on the internet. WQEW (then standards) was received in AM stereo and recorded via skywave I believe somewhere in Ontario. When the signal was solid, as it was during most of this recording, the audio was amazing.


(thanks Leonard!)

I'd like to think of it as "The Wrath of Khan".
 
I've read posts from AM fans who bitterly complain about the FCC allowing so many electronic devices to interfere with AM reception in recent decades. But I recall that even 35 years ago here in San Francisco, the overhead electric trolley wires created a lot of static on the AM band, and made listening to AM in the car a challenge. At the time, FM reception problems in hilly SF made listening to FM even more annoying in many parts of town. But once the challenges for FM were technologically solved (by the 80s), it was all over for AM...in my opinion.
 
I listened to KOMA/1520 (Oklahoma City, OK) in AM STEREO on my car radio. I loved the added depth the sound had on my eight speaker car radio. This was I think in the very late 60's or was it the mid to late 1970's, before KOMA had a change in format. I changed cars several times and lost the AM Stereo car radio I had.
 
kenb said:
I listened to KOMA/1520 (Oklahoma City, OK) in AM STEREO on my car radio. I loved the added depth the sound had on my eight speaker car radio. This was I think in the very late 60's or was it the mid to late 1970's, before KOMA had a change in format. I changed cars several times and lost the AM Stereo car radio I had.

That couldn't have been the late '60s or '70s if it was true AM stereo. Besides a few test broadcasts in the late '70s, full-time AM stereo broadcasting didn't begin until 1980 or later, and true AM stereo receivers weren't on the market until at least 1980. You may have been hearing mono KOMA coming through eight speakers and I'm sure it sounded good, but it wouldn't have been true AM stereo before 1980.

I don't know when KOMA started with true AM stereo because I wasn't in the area, but I visited the southwest in the mid-late '80s when KOMA was broadcasting oldies in true AM stereo, and it sounded great even by skywave!
 
Eli Polonsky said:
kenb said:
I listened to KOMA/1520 (Oklahoma City, OK) in AM STEREO on my car radio. I loved the added depth the sound had on my eight speaker car radio. This was I think in the very late 60's or was it the mid to late 1970's, before KOMA had a change in format. I changed cars several times and lost the AM Stereo car radio I had.

That couldn't have been the late '60s or '70s if it was true AM stereo. Besides a few test broadcasts in the late '70s, full-time AM stereo broadcasting didn't begin until 1980 or later, and true AM stereo receivers weren't on the market until at least 1980. You may have been hearing mono KOMA coming through eight speakers and I'm sure it sounded good, but it wouldn't have been true AM stereo before 1980.

I don't know when KOMA started with true AM stereo because I wasn't in the area, but I visited the southwest in the mid-late '80s when KOMA was broadcasting oldies in true AM stereo, and it sounded great even by skywave!

I remember back in the 80's, listening to KSL/1160 (Salt Lake City, UT) in Stereo on skywave in Phoenix. It sounded fantastic, especially when they carried the Mormon Tabernacle Choir on Sunday nights. The Stereo sound was phenomenal!
 
WWBF 1130 in Bartow, Florida (Oldies) was still broadcasting in AM Stereo about 5 years ago. Sounded pretty good for AM.

Don't see any mention of AM Stereo on their website anymore...maybe their encoder finally kicked the bucket.
 
Obtuse1 said:
WWBF 1130 in Bartow, Florida (Oldies) was still broadcasting in AM Stereo about 5 years ago. Sounded pretty good for AM.

Don't see any mention of AM Stereo on their website anymore...maybe their encoder finally kicked the bucket.

WWBF did sound good in stereo, but alas, they are no longer in stereo, not sure when it died, but WWBF is a family operation. (Father, mother and son) and it is run on a shoestring budget; they had a problem with the stereo back in 2003 and the had a transmitter problem and between the money and the lack of some parts, it was a miracle they returned to stereo.

As far as I know, they were the last AM stereo station in Florida.

btw- They were stereo during the day; when they powered down and went directional at night, they were mono.

drt
st. petersburg
(60 miles w.s.w. of Bartow- home of WWBF)
 
I put WODX 1480 and WMIB 1660 on in stereo in May of '99. They stayed that way for a couple of years and sounded teriffic. One of the best AM Stereo stations was WOKY in Milwaukee. On an early 2000's Dod Stratus radio they sounded awesome!

Those Chrysler product radios were excellent AM Stereo performers.
 
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