[BC] Re: Oscopes and Bessel null, FM modulation

[Xmitters@aol.com]

In a message dated 7/21/06 12:00:38 AM Central Daylight Time, 
broadcast-request at radiolists.net writes:

<< If the higher-order sidebands are a result of excessive carrier deviation 
--  
 one component of FM bandwidth.  As a rough approximation, Carson's Rule 
 states that ~ 98% of occupied bandwidth can be determined by use of the 
 following formula:
 
 BW  =  2(Dmax + Fmax)
 
 Perhaps it's for the reason you mention that the FCC interprets 
 over-modulation as exceeding one peak per ten-second interval, or six peaks 
 per minute.  This allows for a relatively generous margin of error whether 
 the error is truly in the transmission, or in the measurement.
 
 Paul >>