--- In [email protected], Matthew Kaufman <matt...@...> wrote:
" Correct. Which is also why measuring DAQ equivalent this way is pretty much useless for anyplace that has substantial terrain (hills and mountains) or even reflective urban structures that aren't in the center of the coverage area (highrise buildings in a suburban area that is some ways away from the transmitter). Most of the audio quality problems that result in unintelligible signals at the edge of the coverage are caused by flutter and multipath, neither of which is detectable by looking at the level of an unmodulated carrier." ---------------------------------------------------------------------- Carrier level equivalence to desired DAQ is not "pretty much useless" because coverage pediction and acceptance testing based on TSB-88 does not use "static" measurements such as 12 dB SINAD as a DAQ target but rather uses faded signal measurements for the equivalence. These faded sensitivity targets require significantly greater carrier level to meet a given DAQ value specifically because of the flutter and multipath - which are reasonably well understood and incorporated into a number of predictive algorithms which are used internally by the coverage prediction software.
