Pardon me if this has been mentioned before but I do recall several threads regarding type acceptance requirements for LPFM transmitters and lamenting the fact that Nautel did not have one. I saw this mentioned in a newsletter I received from them today. You can order this bad boy with an Orban processor built it plus a lot of other bells and whistles.
http://www.nautel.com/solutions/fm-vs-series-300w-2-5kw/vs300-for-lpfm/
http://www.nautel.com/solutions/fm-vs-series-300w-2-5kw/vs300-for-lpfm/