Check the FCC website under commercial rules and regs.

Jim

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Sean Breheny
Sent: Sunday, September 06, 2009 2:43 PM
To: Microcontroller discussion list - Public.
Subject: [TECH] Required frequency accuracy for AM stations?

Hi all,

I am looking for the typical carrier frequency accuracy for AM
broadcast band stations in the US. This is something that I thought
would be easy to find on the web but I can't seem to do so. I tried
the FCC rules and couldn't find this in the part which applies to AM
broadcasting. General web searches didn't bring up any useful results,
either. I am sure someone here knows, perhaps Harold H.?

I am asking because I was trying to use a few strong local AM stations
to check the calibration of a used spectrum analyzer's frequency
reference. When I check it against a Fluke 6060A signal generator I
have, I get a 6ppm discrepancy. When I looked at two local AM
stations, I got 10ppm for one and 17ppm for the other. The analyzer is
supposed to be good to 1ppm. I'm not entirely sure of how good my
6060A is, since I bought it on eBay "guaranteed not DOA but no further
testing". However, it has the high stability ovenized reference option
and when I beat it with WWV on 10MHz, I cannot discern any beat (so it
has to be better than 1/4 Hz or so at 10MHz).

Thanks,

Sean
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