> Incidently, I heard from one of my early mentors in the FM stereo > business, > that the reason the 29.7 dB. figure was used for an FM stereo > specification, > was that it was about as good as you could measure graphically using the > gratical on the oscilloscope. It was a byproduct of 3 degree phase error between the main channel and the stereophonic subchannel. - JimT