On Sun, 26 Jun 2005 18:33:04 GMT, "Frank Dresser"
wrote:

Sec. 73.44 AM transmission system emission limitations.



(a) The emissions of stations in the AM service shall be attenuated
in
accordance with the requirements specified in paragraph (b) of this
section. Emissions shall be measured using a properly operated and
suitable swept-frequency RF spectrum analyzer using a peak hold
duration of 10 minutes, no video filtering, and a 300 Hz resolution
bandwidth, except that a wider resolution bandwidth may be employed
above 11.5 kHz to detect transient emissions. Alternatively, other
specialized receivers or monitors with appropriate characteristics
may
be used to determine compliance with the provisions of this
section,
provided that any disputes over measurement accuracy are resolved
in
favor of measurements obtained by using a calibrated spectrum
analyzer
adjusted as set forth above.

(b) Emissions 10.2 kHz to 20 kHz removed from the carrier must be
attenuated at least 25 dB below the unmodulated carrier level,
emissions 20 kHz to 30 kHz removed from the carrier must be
attenuated
at least 35 dB below the unmodulated carrier level, emissions 30
kHz
to 60 kHz removed from the carrier must be attenuated at least [5 +
1
dB/kHz] below the unmodulated carrier level, and emissions between
60
kHz and 75 kHz of the carrier frequency must be attenuated at least
65
dB below the unmodulated carrier level. Emissions removed by more
than
75 kHz must be attenuated at least 43 + 10 Log (Power in watts) or
80
dB below the unmodulated carrier level, whichever is the lesser
attenuation, except for transmitters having power less than 158
watts,
where the attenuation must be at least 65 dB below carrier level.

(c) Should harmful interference be caused to the reception of other
broadcast or non-broadcast stations by out of band emissions, the
licensee may be directed to achieve a greater degree of
attentuation
than specified in paragraphs (a) and (b) of this section.

http://kauko.hallikainen.org/FCC/FccRules/2005/73/44/