>nj902 <[EMAIL PROTECTED]> wrote: >>When testing a receiver, the recovered audio signal to noise ratio >>does not equate to the RF CARRIER to noise ratio required to produce >>that result. >> >>The actual numbers for a typical analog FM receiver operating in a >>+/- 5 KHz deviation system are: >> >>The thermal noise floor [kTB] in the receiver's effective noise >>bandwidth = -133.2 >> >>CARRIER to noise to produce 12 dB SINAD per EIA methodology = 4 DB >> >>Therefore the theoretical best sensitivity for 12 dBS would be -129.2
.078 µV; yup sounds about right (had to do the conversion because I "think" in µV, kind of like feet vs. meters. Probably because the first service monitor I ever used had the dial marked in µV). I had always wondered what the 12 dB SINAD level equated to in dB of signal above the noise floor. Thanks for posting this info. BTW, I'm curious about the theory behind the SINAD-C/N relationship. If you have any links to references on this subject please post. Thanks. Bob NO6B
