In the last week, several new LPFM issues have arisen – one a Congressional push to authorize more of these stations by ignoring third adjacent channel interference to full power stations, and another involving complaints to the FCC about LPFM stations being forced to change channels or cease operation because of interference from changes made by full power stations. The latter issue has apparently arisen in the context of stations taking advantage of the FCC’s rules which made it easier to effectuate changes in the cities of license of FM stations (see our summary of the rule changes here), causing more movement of such stations. Both of these issues could present issues for FM broadcasters.
The Congressional action was initiated by the introduction of legislation in both the House and the Senate that would eliminate third adjacent channel protections that full power stations have from LPFMs. Those protections have been the subject of controversy since the FCC authorized the LPFM service. LPFM advocates have contended that the interference protections are unnecessary, as most FM receivers should be able to distinguish between stations on third adjacent channels. The NAB contends that the protections are needed as there are still many radios that would be affected by that interference. Full power stations, except for those authorized at short-spacings prior to 1964, are protected from third adjacent channel interference from each other. Competing engineering studies have been done, the FCC has not acted on this question (and in fact Congress had prohibited such action years ago). But now, some feel that the time for some liberalization of the rules is in order.