I thought you might be interested in the story of how the repeater split

 (146.400/147.435) came about. Today of course it seems a bit odd but all of this

 happened long before the 2 Meter band plan came out. At the time of the

 installation on Mt. Wilson, (sometime in 1962 I think) the only other repeater on

 the air was Art Gentry's K6MYK machine. Its input was 145.180 and its output

 was 146.980 (I still have the crystals). This one was all AM at the time.

As FM was just starting to become popular, Burt wanted to accomodate that as

 well and he had an idea to have two inputs, AM and FM for the Mt. Wilson

 repeater. I was involved in a survey of frequencies on Mt. Wilson using a Stoddart

 NM-30 receiver in conjunction with a my Heathkit Pawnee as I recall to find a

 repeater pair for Burt that was relatively free of intermod. We decided on 146.400

 for the output and 147.425 for the input.  Then it was decided that there should be

 two inputs centered around 147.425 at +/- 10 kHz which gave rise to 147.435 for

 the AM input and 147.415 for the FM input. At the time all of this conversation

 was going on, the repeater was put on the air as an AM repeater using the two

 frequencies idendified for the AM operation with the plan being to implement the

 FM operation later. The output was always on 146.400. Well, as FM grew rapidly

 in popularity during those days and AM diminished, what actually happened was

 the old AM pair became the present FM pair and the other pair was never used.

 When the repeater changed hands after Burt gave it away, the input and output

 was later reversed to its present configuration using 147.435 as the output and

 146.400 as the input. (The reason for that is unknown).

73, Steve Jensen, W6RHM