It sounds a lot like RF interference, I have never had this problem with Pro Tools or our 003r, but I have had it with radio mics, albeit in the late 80s early 90s. Can you recreate the problem by just recording the channel with the mic preamp turned up, but without the mic? Until you find out what the problem wasis try running a second mic, ideally a dynamic, and see if you are getting the same problem. That way you will be able to narrow to work outdown whether it is something to do with the phantom power.