I have an application where I need to detect an unmodulated tone at a fixed
baseband frequency on an FM carrier. The mod index of the tone is quite
low, such that only the first Bessel pair of FM sidebands is significant.
Can I demodulate the tone by directly detecting its Bessel components (the
first two sidebands) at RF without first passing the composite FM signal
through a discriminator? Any references to this would be appreciated.
The purpose of this is to gain detector sensitivity, as it would eliminate
the conventional discriminator threshold.
