If you chose to go digital, like P25 then you could also measure BER in your coverage test? This maybe more meaningful. Although many public safety customers will still ask for voice checks as well.
On Sat, Aug 28, 2010 at 12:52 PM, Matthew Kaufman <[email protected]>wrote: > > > On 8/28/2010 8:38 AM, nj902 wrote: > > > > Because a mobile radio really has no way to provide a meaningful > delivered audio quality indication, coverage acceptance testing of analog > systems is usually done by measuring carrier level at [mobile] locations > throughout the system's service area and using DAQ equivalence as defined in > TSB-88 to determine whether the values measured meet coverage requirements. > > > > During these coverage acceptance tests, the system base station carrier > is unmodulated, thus the measured values have no relationship to the > bandwidth of the system and would be identical for a given base station > transmit power - regardless of which mode it is programmed for. > 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. > > Matthew Kaufman > > >
