The image frequency for an FM receiver with a 10.7 mHz IF
is 21.4 mHz above or below.  Perhaps they were worried about
receivers with IFs in the 5 mHz range?

--
Chuck Forsberg WA7KGX N2469R     c...@omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
  Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430


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