This means the SYS ID = 104. Since the site number is 504, this could either be for testing purposes, or this system might be part of a much larger and complex (metro area) Project 25 TRS yet to come. You might see other area P25 trunking systems come online down the road with a SYS ID of 104, but with Site numbers like 101, 201, 301, 502, or 901, etc. A good example of this type of setup would be the Phoenix Regional Wireless Network (PRWN). On the other hand, the city of St. Louis, might be approaching this from a future perspective, where their TRS would fit into the scheme of things as part of a statewide interoperability matrix. Nonetheless, it will be interesting to watch things unfold in the St. Louis Metro area over the next 1-3 years.
Now, for a few minutes on Tuesday night, i Received: (which could be erroneous info)
--SYS ID: 0104-0504 (so sysID 0104 site 0504)
--(doesn't really make sense that it is site 0504)
The PRO-162 will not work with the city's trunked system - you need a scanner capable of tracking a digital system like the Uniden BCD396T shown here; http://www.radioshack.com/product/index.jsp?productId=2952982&cp=2032052.2032072&parentPage=familyI have just purchased a RS Pro-162 scanner