--- In [email protected], "Jim B." <[EMAIL PROTECTED]> wrote: "... Blocking-definitely...."
--------------------------------------------------------------- No. What we are really talking about here is simply called co-channel interference, not blocking which has an entirely different industry accepted definition. For example, the ARRL defines blocking this way: "The purpose of the Blocking Dynamic Range Test is to determine the level of gain compression, or desensitization, that occurs as a result of another signal on a nearby frequency. The blocking dynamic range is the difference between the level of the noise floor from the level of undesired signal that produces a 1 dB decrease in a weak desired signal." The TIA defines it this way: "Receiver blocking is a measure of the ability to receive a desired signal on the assigned channel frequency in the presence of a single tone that is offset from the center frequency of the assigned channel on frequencies other than those of the adjacent channels." For those interested in current industry thinking with repect to all aspects of receiver performance in various faded and interference limited situations, a study of TSB-88 would be beneficial. The TIA has this to say: "Co-Channel Rejection Different modulation types and implementations require different co- channel protection ratios. The significance of Co-Channel Rejection goes beyond operation in co-channel interference: as measured per [102.CAAA], Co-Channel Rejection is equivalent to the static IF carrier-to-noise ratio (Cs/N) required for obtaining the sensitivity criterion of the receiver under test."
