Ventured down to UM Boston visit with a friend on the BPD command staff. Really not that much security at the Library site but full set up at Park Plaza (?). He began a conversation with a USSS agent who was a good conversationalist. As Kenny said the two main channels for Protection were encrypted, but they had at least 4 simplex digital non encrypted for the talk around. They were "tagging" the cars in the two close (dignitary) parking lots and the agents were talking back and forth on them. They had APX 8000's but one simplex channel was in their scan that was a DOD channel who had the WMD dogs that was in the clear. Nothing sensative was being said besides "glorified" parking lot chat. I was told the simplex on digital and encrypted for talk around delayed much on their conversation so they switch to simplex digital. The comms truck can still hear them and it can transmit them on simplex.
Of course the college was closed for the day, and a chuckle came over a simplex that a spotter on the roof saw 4 students with DD cups and could someone ask them where is the DD near the college. (They arrived just before 2 and were not going to leave until 5:30 ish) i'm sure that was not over the protection detail channel. (haha)
Downtown was all on the two channels mentioned above encrypted.
Thanks for the channel info, was interesting even if encrypted on the PP side