LTR systems still in use

[stmills]

I have spent some time recently trying to see if any LTR systems are still on the Air in the Twin Cities:
The only LTR I have picked up has been from Action Radio for buses.
ANCOM, Comm Center/PWC and Mobile Radio Engineering/Minnesota Mobile Telephone all seem to have dropped LTR for their Digital systems. Action Radio is the only one to still list analog on their system website.
As for private systems I also checked the following and found nothing: Cemstone, CenterPoint, Delta Airline UHF, Quicksilver.

 

[JASII]

Great post.

Is it all of the Action Radio LTR systems or is there just one Action Radio LTR remaining?

Every so often I will go up and down the bands and see what has changed. I little off your topic, but Marine 16 Coast Guard has changed names over the years.

At one time it was: United States Coast Guard-Upper Mississippi-Keokuk Iowa Group

Then, somewhat more recently it was Saint Louis Missouri Sector.

Now, it is Western Rivers (Still in Saint Louis, though.)

 

[stmills]

I believe Action Radio only has 1 system left- I believe it is only the Champlin system- that is all I have found. It will be interesting next month to see if the State Fair Parking/Buses are still on this system or on to something different.

 

[JASII]

One thing that I have done in the past to try and identify frequencies in use and selective signalling is to program a my Uniden SDS100 with frequencies in sequential order. For example, the frequencies below. Under Set Audio Type I select Digital Only. (In Butel and other software it actually shows SQ Mode P25 and SQ Code Search.) Then I scan them will I am doing other things and have the software lock out channels that are active. Then, when I check History Logging it will show a list of active digital frequencies, the mode used (DMR/P25/NXDN) and the Color Codes/NAC Codes/RAN Codes. Granted, that scans past all of the analog frequencies, but it is a nice way to determine active digital frequencies.

Analog frequencies are more of a challenge, of course, because some are carrier squelch, like many railroad channels and fire tone out frequencies. However, it can be done with analog, too, and I end up with a list of analog channels and their PL/DPL in use.

460.0500
460.0000
460.0125
460.01875
460.0250
460.03125
460.0375
460.04375