Send these updates to me, I will make sure that the database is updated accordingly. I know that with the major rebanding project that is getting underway, there are going to be substantial changes to the frequency listings at all of the tower sites over the coming year. Sadly, we rarely receive any information from Northern Lower Peninsula and Upper Peninsula of Michigan. So we often have to go by information that is rarely updated from those areas.
All of the simulcast systems on the MPSCS, have the ability to use the "Dynamic Sharing Arrangement" (Hereafter: DSA) feature. This means that if all of the frequency pairs are in use at one site, it will borrow one or two frequency pairs from a neighboring site. Conversely, stand-alone towers can also borrow frequency pairs from simulcast systems. This has been very commonplace in the Metro Detroit area.
For instance, the Washtenaw County Simulcast System is fully loaded and a public safety unit keys up at a major fire scene in Northfield Twp. on one of the Interop talkgroups, but all of the frequency pairs are in use. The site controller will check with all of its neighboring sites, and take a pair that is not in use. In this case one pair from the nearby Northville site so the transmission would be relayed to the other units on the Washtenaw County Simulcast System. If the heavy traffic continues, one of the next transmissions could take place on a frequency pair normally assigned to the Adrian, Howell, or Munith towers thanks to the DSA programming.
The database was updated with this information for the benefit of Uniden Scanner owners. In the past, we would receive complaints about missed radio transmissions during peak times on the MPSCS. It was decided to include frequency pairs that are often used in the DSA plan at each site. Thankfully, GRE and Radio Shack scanners don't miss radio transmissions when the DSA feature activates.
73s
Ron