FM Narrow / narrowband FM. Typically, FM would be 20 khz or thereabout, and NFM would be 11.25 khz or less. If your scanner doesn't do narrowband FM, it's not a big deal. But if your scanner does have an NFM mode, you should use it on those frequencies that are listed as NFM.Hello gents. Just wanted to know what "FMN" signified in some mode listings in the database. Would
appreciate any info.