-=> Quoting Jasen Betts to Tom Walker <=-

 JB> Hi Tom.

 JB> 14-May-04 08:12:54, Tom Walker wrote to Ken Weitzel
 
 
 -> TW>I think we have a Translation problem that list was NOT from an
 JB> English ->   >speaking Country. We can agree that the Vertical Rate
 JB> is Synched to ->   >the 60 Cycle Line and that the Frame Rate itself
 JB> is 60.
 
 TW> -> Perhaps you guys want to agree that vertical is -> sync'ed to
 TW> the ac line, but I don't :)
 
 TW> Well it is connection somewhere to the Power Line frequency. Else
 TW> why is out frame rate 60 and that of Europe 50??

 JB> The really early televisions were electromechanical, and a synchronous
 JB> motor was the easiest way to work the vertical sync. etc...
 
But that was back in the 1930s. Scanning disk systems went out way
before broadcast became common enough for there to be standards.

But power line frequency affected a lot of design choices. Such as
reducing interference.


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