Federal Register publication of the Further Notice of Proposed Rulemaking on Low Power FM (LPFM) stations and their relationship to FM translators and upgrades of full-power FM stations occurred today. This sets the comment dates in that proceeding – with comments due April 7, and replies on April 21. This proceeding looks at technical issues of whether LPFM stations (which were originally authorized as secondary stations, subject to being knocked off the air if they caused interference to full-power stations (including new stations or increases in the facilities of existing stations), should be protected against interference from such new FM facilities. Also, the proceeding looks at whether LPFM should get a preference over FM translators, perhaps even being able to bump existing FM translators off the air to make way for new LPFM stations. We wrote more about this proceeding, here. FM station and FM translator licensees should be sure to file comments with the FCC on how this proceeding could affect their operations.