Bad RF Engineering and Implementation?
Lubbock switched back to phase 1? That is only a 2 site simulcast, they couldn't make that work either?
If you try to build simulcast systems on the cheap by using more HAAT and fewer sites, you can been assured of SDS problems.
More sites at lower HAAT and lots of electrical down tilt on the antennas is needed to minimize the overlap areas. In urban environments you can have shadowing from buildings and clutter that creates lots of pockets of near equal power from simulcast sites, one near and one far and the intersymbol interference goes through the roof.
High speed simulcast is a black art and not all RF Engineers get a handle on it, especially if they are driven by the sales to folks to make it competitive by leveraging existing installations to save money/increase profit/commission!
Lubbock would probably need four to six sites for Phase II TDMA simulcast, depending on the amount of building penetration coverage you want for handhelds.
