The APX 7000 is the top-tier Motorola P25 dual-band offering. There are less expensive single-band options that are TDMA capable, so it's hardly fair to base the costs on the fully loaded $7,000 APX model. Yes, even the bottom tier APX 4000 series is not exactly cheap at $2,600, but that's a big difference from a $7,000 APX 7000, so let's be fair here when discussing the costs factors.
For the record, Nassau County's system is FDMA, not TDMA. They simulcast some of the talkgroups on T-Band for the benefit of local agencies who are not on the P25 system, not because they are trying to overcome system design flaws or "weak signals, no signals, and dead spots". The county police operate on the system exclusively, which means local village police and other agencies are unable to monitor them unless they are on the system themselves.
If the system is designed properly from the get go, and properly built out to the engineered specs, the coverage will be nearly identical to what was plotted during the design and engineering phase. There's really no big mystery to it...do the job right and the system will work as expected. Cut corners and you're going to have issues.
For the record, Nassau County's system is FDMA, not TDMA. They simulcast some of the talkgroups on T-Band for the benefit of local agencies who are not on the P25 system, not because they are trying to overcome system design flaws or "weak signals, no signals, and dead spots". The county police operate on the system exclusively, which means local village police and other agencies are unable to monitor them unless they are on the system themselves.
If the system is designed properly from the get go, and properly built out to the engineered specs, the coverage will be nearly identical to what was plotted during the design and engineering phase. There's really no big mystery to it...do the job right and the system will work as expected. Cut corners and you're going to have issues.