Paul, are not AM broadcast stations still assigned frequencies on a 10 KHz
spacing?
If so, that would appear to limit the upper end of audio response to about
4500Hz, leaving a small amount of guard band between adjacent stations.
Straighten me out on this one, please! <:}
73/72, George
Amateur Radio W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:w5yr@att.net>
----- Original Message -----
From: "Paul Christensen, Esq." <w9ac@arrl.net>
To: <geraldj@isunet.net>; <tentec@contesting.com>; <w8au@sssnet.com>
Sent: Friday, April 18, 2003 2:16 PM
Subject: Re: [TenTec] Enhanced SSB
> > damping to let the microphone hear only the "golden tones" of the ham
> > transmitting. AM broadcast doesn't even allow going to 15 KHz.
>
> Prior to the implementation of NRSC mask in the early '90s, AM Broadcast
stations had no upper limit. The NRSC mask now effectively
> limits the audio passband to approximately 9.5 kHz....and the service
still sounds poor despite attempts by broadcast stations and
> receiver manufacturers to improve the quality.
>
> WOR in New York has been experimenting (yes, even broadcasters are allowed
to experiment just like hams once were) with digital IBOC
> but the jury is still out on whether it can be a viable mode given sky
wave propagation, fading, noise & interference, etc. The
> IBOC receiver goes into an analog "blend" mode when the BER reaches a
pre-determined threshold. I haven't heard it, but I can only
> imagine...
>
> -Paul, W9AC
>
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