All right, I haven't been on here in a while guys and I've been sitting on these CBP tones for a while:
A few weeks ago, I went to the beach in Corpus Christi, and on the way had my scanner on, and for it being early sunday morning, CBP was blowing up. I was getting a ton of voice traffic on I-37 traveling south and started hearing this all in maybe Wilson and Live Oak counties.
163.625 MHz DCS 025 (Primary Dispatch)
163.650 MHz DCS 026
163.675 MHz DCS 034
163.775 MHz CTCSS 100.0 (Used for OTAR)
163.775 MHz NAC 302 (Encrypted voice)
170.675 MHz NAC 280 (Tactical) (heard units working on 163.65 say to switch over to "Tactical" to continue working one incident, and then when this came up, it was Encrypted Voice)
And many months ago, I took a trip to Schulenberg, and on the way back, I was hearing CBP Primary, 163.625 MHz in P25 with NAC 056. I heard extended voice conversation, with multiple agents attempting to talk to another agent whose radio had been programmed wrong and she couldn't get the encryption to turn off and apparently everyone else was hearing it cause their radio's hadn't been re-keyed to be compatible with her radio yet. I heard them chatting for almost 25 min off and on on I-10 traveling west back towards San Antonio, probably through Fayette and Gonzales counties.
So that's 3 P25 channels that CBP has in use that I don't think have been reported before, and though I'm not sure of the actual locations of the transmitters, those are the areas I monitored them from.