Well, I no sooner set my CTCSS/DCS to OFF on Frequency 460.0500 and started getting what sounds like static/buzzing for about 3-5 seconds.
The amount of times that I'm hearing this sound would be comparable to if they were talking on their radios. Sometimes it's every couple of minutes, sometimes I don't hear anything for a few minutes and then when I do hear it, it can last for what seems like the length they would be talking on the radio: 2 seconds to 30 seconds, average time seems to be about 3-5 seconds.
Does that sound like it's a digital frequency to you?
If so, how would I find out if it's Phase I, Phase II, or Encrypted?