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I have read that the strange numbering on the tuner was to make for quick tuning in most areas by skipping over adjacent channels that would not be assigned in a given area. Of course, cable changed that by using adjacent channels. For example the 2,4,5,7,9,11,13 group would be perfect for the Seattle area in the 50s, while 3,6,8,10,12 would be well suited further south in Portland. Remember, 4 and 5 are not considered adjacent channels because of the 4 mHz wide aircraft locater band situated between the two channels.
jr
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