[BC] Bessel Nulling an FM Transmitter

[Blake Thompson]

You could also use one of the good things the NAB did... they put a full 
set of Bessel null tones on their broadcast audio test cd. I picked one 
up in the early 90's for cart testing once we got cd's in the studios. 
It includes the 14945.4 hz signal that corresponds to 110% mod. / 82.5 
khz deviation, and 100%  FM, TV BTSC, TV mono, and even SCA's. Easier 
than trying to get your generator to that EXACT freq.

stanleybadams wrote:

><snip>
>If you really want to be 1000% accurate, use you will need an extra low freq
>counter that is accurate to about a hundredth of a cycle and that is what
>you use to parallel across the audio genset that you are going to use.  Use
>your regular dBm console meters or a more accurate indicator if you have one
>across the output line and with the right freq and the right percent you
>will see the carrier null and it will appear that the station has gone off
>the air.
>
><snip>
>Stan
>Memphus
>  
>

-- 
Blake Thompson CBNT
WZIP-FM www.wzip.fm
SBE Chapter 70 Vice Chairman