--- In Repeater-Builder@yahoogroups.com, "Andrew Seybold" <aseyb...@...> wrote:
"The new repeaters are exactly the same at the older ones, and the older ones are capable of being converted to narrowband with programming, all Motorola and the all are in simulcast mode, we have plotted the differences between one that is wide band and one that is narrowband in over 50 different locations and the signals are, when seen by a mobile unit, weaker from the narrowband radios, the mobiles are all capable of both wide and narrow band service and of the 160 channels in the radios some are narrow band, also at the same time we added 3 new simplex channels on 150 and same result, car to car range is diminished somewhat however we have not measured that at the moment" -------------------------------------------------------------------- Just out of curiosity, when you say: "...we have plotted the differences between one that is wide band and one that is narrowband in over 50 different locations and the signals are, when seen by a mobile unit, weaker from the narrowband radios...", what specifically do you mean "by a mobile unit"? Are you using a spectrum analyzer or calibrated receiver to measure the carrier level received at the "mobile unit" locations? 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.
