Oh goody, goody!! I think I learned something new. I might have figured out this frequency. Using the extensive notes my dear sweet late hubby kept I see that in 2016 the Taos dispatch center had but 2 nets with repeaters on San Antonio. They were the Carson NF and the BLM New Mexico Farmington District net that covers both the district's field offices, Taos and Farmington. Unfortunately, I don't have a 2019 frequency directory that says this. Today, while trying to figure 172.6125 out I remembered a trick late hubby used. He would just type in the frequency followed by "MHz" to eliminate all the sites that have the number 172.6125 in them. I did a search this way and found 172.6125 is assigned to the BLM in Utah, California and Oregon in various locations. It follows that this frequency would be used in New Mexico by the BLM also and not by the Carson NF, the only other agency with a repeater on San Antonio.
So if I were a betting person I would put money on the transmission being that of the BLM Farmington District on the San Antonio repeater site. I also found a directory that showed the remote bases of the Taos dispatch center for National Flight Following and National Air Guard are located on San Antonio., so the site must have wide area coverage.
There is, however, one more possibility that being the transmission heard was on a Farmington Field Office repeater.. Those are located on Archuleta Mesa, Hood Mesa, Huerfano and Smith Pass. Hood Mesa and Smith Pass are the closest to Colorado. The other factor is that the 2013 and 2016 guides in hubby's notebooks don't show any Taos dispatch repeaters using Tone 192.8.
Did I do OK? I'm just beginning to learn this stuff after finally getting up the nerve after nearly 2 years to look though my late sweetheart's radio hobby notebooks. I've been interested in scanners since a little kid with my dad having one on in the house in the towns we lived in around Arizona. He is 92 now, a retired U.S. Forest Service civil engineer. We listened to the FS nearly all the time when I was growing up. I relied on my husband to figure out all the frequencies, tones, callsigns and verbal shorthand, but now I've been on my own for nearly 2 years, so I have to do it myself. My dad is very good at that stuff, the only thing on computers he is really sharp at is Google!