In article ,
says...



"Steve" wrote in message
ups.com...
On Sep 30, 5:09 pm, "David Eduardo" wrote:

Bob Orban, on the NRSC committee, found that consumer radios almost
without
exception, rolled off by at least 10 db by 4.2 kHz, and passed
practically
nothing over 5 kHz.

That's funny, I just asked Bob if he 'found' this and he said no way,
that you're basically just making **** up off the top of your head.


The document was linked from one of Mr. Orban's posts on this ng, and is
searchable by Google.

Go to http://www.nrscstandards.org/ and click "AM Bandwidth Study." See
Figure 1 for the results. Note that this graph assumes NRSC preemphasis at
the signal generator. (Footnote 3)

This was the work of an NRSC working group that included me and many other
broadcast engineers.

Bob Orban