scankid2591 said:
Is it gonna be the VHF Trunked for sure or are they still deciding?
Well from sound of it they went with 2 option Simulcas and Trunking. after reading it Trunking is the only way to go
Also 800mhz wouldn't do good here with over 3,000 square miles on the central coast of California that would cost way to much.
Simulcas:
The major disadvantage of a simulcast system is the cost of implementing and
maintaining the high-precision timing and frequency control equipment and site-to-site
links. In addition, simulcast systems can be difficult to optimize and maintain in
adjustment to minimize zones of interference, with the difficulty increasing as the
number of sites increases. The received audio may have a distorted sound in the
overlapping interference zones, so the system designers generally try to locate thosezones in unpopulated areas. Modern simulcast technology has generally reduced these
problems to manageable proportions and many public safety simulcast systems are now
in operation throughout the United States.
Trucking:
A trunking system offers many advantages. One of the biggest advantages is system
capacity, in terms of both the volume of calls and the number of virtual channels (or talk
groups) the system can support. Because channels are assigned on demand in real time,
they are utilized much more efficiently than in a conventional (non-trunked) system.
Many more calls can be “packed” into the same channel allocation. Talk groups are no
longer tied to physical channels, so many more talk groups can be accommodated,
including temporary talk groups created “on the fly” for special situations.
A trunked system’s large call volume and talk group capacity also enables multiple
agencies to share the same system as well as interoperate with each other. In Monterey
County, for example, many or all of the law enforcement and fire agencies might share a
common system with not only each other but with other non-public safety agencies. Talk
groups could be organized to provide a multi-layered mutual aid communications
structure compliant with the Incident Command System
Another major advantage of trunking systems is reliability. The loss of a single
transmitter, or even an entire site in a multi-site system, would not necessarily disable any
talk group. A further advantage is the ability to organize trunking systems for wide-area coverage.One approach is to use the trunking controller to automatically re-assign frequencies to units as they move between repeater coverage areas
