[GreenKeys] Why and When 7.00 vs. 7.42 unit code?

[Duncan Brown]

> Related question is why are there 60, 75, and 100 wpm models - why 
> were some channels 100wpm and others 60wpm? Was it just a question of 
> gradual upgrading? What speed did the FOX broadcasts run?
>
Nick - I think it was mainly the trade off between throughput and 
maintenance.  On busy circuits, the higher speed was used, but more 
maintenance was required and machines would not last as long.

Duncan


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