I am picking up site 3201 on 858.4625. Unknown location.
Look at site number 963 in the Ameren P25 database. AmerenMissouri (P25) Trunking System, St Louis Metro Area/E MO, Multi-State - Scanner Frequencies
It shows that frequency and is in Marston in New Madrid County.
I bet that is the site you are getting.
They are still using the Edacs sites here but the P25 activity seems to be picking up the greater of the talk now.
If you have two radios, you can listen to the edacs sites in your area and see if they are simulcasting the chatter from the P25 site you found back on one or more of the edacs sites.
That's a good way of determining the talkgroup as they are not very well documented on the P25 sites yet. Especially away from the St. Louis area.
Of course if the talkgroups are not listed in the Edacs database, that will not help you much.
Many of the P25 talkgroups that have been found are just using a generic description.
It is a hard system to figure out what a talkgroup is called going on what you hear alone.
When there are outages in my area at the substation I can see out my window, they can show up on many different TG's. I've always felt they may assign TG's to a "crew" working the area.
So when there is an outage here, I can't just monitor say North County as they may not use that TG that time. It seems very random around here.
Some TG's are commonly used like when a crew calls in that they are complete and ready to close a switch or something or calling dispatch so they can bring a line hot remotely.
Or crews working meter inspections in the city, they seem to always be on the same TG.