I haven't been by I-64 near Mason Rd in a while but to the best of my knowledge the transmit tower is still located there and that is still the primary tower in use.
The actual Troop Headquarters has moved, and moved some time ago to I-64 near Hwy 94 in St. Charles County. However, I don't believe anything beyond that has changed.
A large majority of things are done through the in-car computers so there really isn't a tremendous need for frequent radio use.
42.14 is still rural dispatch and rural car to car frequency. 42.26 is still the rural car to dispatch channel.
The metro dispatch channel and car to car is still 42.10 and the car to dispatch is 42.78. 42.12 is very rarely used, typically only when interference exists on one of the other frequencies.
These frequencies have been in use since I started scanning, which was approximately 10 years ago.
The old 42.06, 42.22, 42.32 and 42.380 frequencies were retired around the end of 2004 early 2005...
The frequency 42.12 should be in that list as well.
You may find it interesting that each of the troop headquarters are still licensed for those original frequencies....except 42.22, and 42.32, which were the mobiles back then.
Perhaps they keep an old transmitter in a back room somewhere they can put back into service during special circumstances.
It appears that Springfield uses the original rural channel pair 42.06/42.22
Just glancing at the call sign of KAA203, it shows it went active in 2002. Does anyone recall what the old license was?
I've been scanning since the mid 1970's........KAA203 was "Kirkwood" back when I first heard them........Back then, the entire state used 42.06/42.22 for rural, and 42.12/42.32 for Metro....and 42.38 was troop point-to-point.
Many of the relays were located near the troop lines, and the output was directed toward adjoining troop, as well as the troop headquarters where the relay was physically located.
Seems like KSR937 was also a callsign from that part of the state as well.........satellite @ Flat River ???
I know the KAA203 is older than 2002........perhaps that's when the additional frequencies were added.
I am showing my age here too but does anyone remember when the highway patrol used (I think) 42.12 as a point to point between troop dispatch centers?
It might just be my imagination but the signal "seems" weaker and fainter.