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AM Sound

74.134.89.134

Posted on May 3, 2017 at 16:36:57
volunteer
Audiophile

Posts: 5666
Location: Louisville, KY
Joined: January 7, 2012
I grew up in the 50s and 60s when AM was king. I don't recall the sound quality being as atrocious as it is today. Real or I just don't remember?


-Wendell

 

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RE: AM Sound, posted on May 4, 2017 at 07:41:52
Eli Duttman
Audiophile

Posts: 10455
Location: Monroe Township, NJ
Joined: March 31, 2000
Your memory may be correct. Everything has been cheapened. :>((

Info. out to 10 KHz. is easy enough to do with AM and that's about right for a 78 RPM shellac record. L_RD knows that many of those were played over the air.

Corporate "bean counters" SUCK. It is possible to make a profit and not "shaft" the customer.


Eli D.

 

Same radio?, posted on May 6, 2017 at 05:38:50
1973shovel
Audiophile

Posts: 10110
Location: Greenville SC
Joined: February 25, 2007
When I was a kid we had a tubed table radio in our basement, with at least a six inch speaker. I (sadly) have no idea what ever happened to it, but I'm betting that if I compared that radio with my cheap Sony clock radio, the old one would sound better.

But even today, when I switch one of my AM equipped tuners, or my GE SuperRadio to the AM band, "just to see", it sounds pretty bad, even compared to what many feel is today's compromised sounding FM.

Is AM worse than it used to be? Possibly. Or maybe we've just grown accustomed to the sound of FM.

 

Down here AM can extend out beyond 10Khz on the ABC's local and national stations, posted on May 6, 2017 at 14:40:08
Timbo in Oz
Audiophile

Posts: 23221
Location: Canberra - in the ACT - SE Australia
Joined: January 30, 2002
And they use the NRSCA pre-Eq curve which boosts the treble, before your AM stage cuts it.

My AM stage is two former wide-band stages and gets out to 13khz, I use the 'soft' Eq. switch which predates NRSCA, and it sounds fine if a tiny bit bright.






Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger


 

RE: AM Sound, posted on May 8, 2017 at 08:28:03
Posts: 34
Location: Maryland
Joined: July 29, 2014
Definitely real. There's no technical reason that broadcast AM radio can't have almost the same frequency response as FM. Indeed, it used to -- as witnessed by passable sound quality is olden days of pre-FM-stereo multiplex when some experimental stereo broadcasts employed sister AM and FM transmitters. The main limitation of AM sound quality was poorer S/N.

 

The modern gears sound or what the stations transmit?, posted on May 8, 2017 at 21:18:20
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
AM is mostly talk these days. There are a few stations I receive that play music that still sound great on good gear.






ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: Medium Wave Sound, posted on May 29, 2017 at 10:30:20
FRG7SWL
Audiophile

Posts: 2107
Location: NorCali
Joined: March 26, 2003
Volunteer, Medium Wave sound on multi-band radios-n-hi-fi receivers took a turn for the worse in the late 80s-early 90s. What used to be fairly clear-n-crisp response became mid-range centric instead. For a receiver which was considered lacking in fidelity, moi's slightly modded ICOM R-71A sounds fuller than mid-heavy ICOM R-75 (R-71's tape feed is rather muffled, & sounds better via headphone output). Used to enjoy Auntie Beeb's World Service & Radio Netherlands' music programming via Sony 2010 through various microphone-n-phono pre-amp feeds. Most sports broadcasts don't sound as entrancing nowadays, either. Gone are the days of hearing ticker-tape machines clack-clacking away in the background, along with occasional profanity from crowd mike. Listening to Ceres/Modesto's KVIN, 920 Khz, however, is like having a time portal back to when AM was king; with their lush-sounding night-time signal & oldies programming. Wolfman Jack's former flame-thrower, Mighty 1090 from San Diego, still retains their historically euphonic sound for their sports programming, though. Too bad they lost Pad Squad broadcasting rights. ... Happy Memorial Day!!! ... 73s para Sactown

 

RE: AM Sound, posted on June 4, 2017 at 11:06:47
gordguide
Audiophile

Posts: 302
Joined: January 20, 2002
Your memories in this case are correct. The regulators limit power from the transmitters (so that stations on the same frequency do not interfere in the local market from a powerful distant transmitter), the stations compensate by highly compressing the signal which carries to fringe areas better. It's all about the listening area which translates directly to the rate card for advertising.

 

RE: AM Sound, posted on June 4, 2017 at 12:47:46
volunteer
Audiophile

Posts: 5666
Location: Louisville, KY
Joined: January 7, 2012
Thanks for the confirmation. I don't really listen to AM much but when I do it is awful. I've yet to find a clean signal in Louisville


-Wendell

 

RE: Medium Wave Sound, posted on June 4, 2017 at 12:50:11
volunteer
Audiophile

Posts: 5666
Location: Louisville, KY
Joined: January 7, 2012
I remember AM signal hopping that allowed me to listen to the St. Louis Cardinals and the Opry and remember it sounding better than anything around Louisville.


-Wendell

 

RE: AM Sound, posted on July 30, 2017 at 21:04:05
Todd Krieger
Audiophile

Posts: 37308
Location: SW United States
Joined: November 2, 2000
"There's no technical reason that broadcast AM radio can't have almost the same frequency response as FM."

Actually, there is a technical reason..... AM radio transmissions are spaced 10 kHz apart..... If stations modulated at frequencies greater than 5 kHz, the frequencies above 5 kHz would interfere with stations broadcasting at the adjacent frequencies.

The only way a station could broadcast with greater bandwidth is if there were no transmitters broadcasting at adjacent frequencies, geographically near the transmitter in question. But in those cases, the radio would need to be modified to take in the higher frequencies. (This would be possible with communications receivers with variable-bandwidth filters.)

If AM broadcasts were changed to single-sideband, they could be be modulated up to almost 10 kHz with the same spacing..... But all radios would then have to be modified to receive stations this way.

 

RE: AM Sound, posted on July 30, 2017 at 21:07:30
Todd Krieger
Audiophile

Posts: 37308
Location: SW United States
Joined: November 2, 2000
"I grew up in the 50s and 60s when AM was king. I don't recall the sound quality being as atrocious as it is today. Real or I just don't remember?"

Since digital devices hardly existed back in those days, there was far less RF interference in those days. So I believe it's real.

I think the proliferation of digital devices is why audio in general hasn't sounded as good......

 

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