[BC] Scope for Mod Monitor...

[Dale H. Cook]

At 04:25 PM 7/19/2006, Jerry Mathis wrote:

>So you have to START with a Spectrum Analyzer, or a calibrated demodulator.
>That's nice, if you have them.

You always have to start with a calibrated instrument, or calibrate 
one yourself. Traceability to NIST is paramount. The beauty of the 
Bessel function method is that it enables calibration of an FM 
deviation monitor with only one calibrated instrument - a frequency 
counter. The calibration of the spectrum analyzer is not important, 
as it is used only as a visual monitor of carrier null.

Dale H. Cook, Chief Engineer, Centennial Broadcasting, 
Roanoke/Lynchburg, VA - WZZI / WZZU / WLNI / WLEQ
http://members.cox.net/dalehcook/starcity.shtml