[GreenKeys] Fwd: Re: Western Union

[Bruce Gentry]

Agreed- but TV was on the air and growing from 1946 onward. In the "good 
old days" in small towns not on the grid, it was a problem. Many of 
those stations still used a 60 cycle vertical and 15,750 horizontal rate 
through the 50s if they  transmitted locally originated B&W exclusively. 
With a 59.94 vertical rate, a set of poor design or in bad condition 
could have a bar slowly crawling  the screen with a good steady 60 cycle 
power source.  Many power systems in the 40s and 50s  may not have been 
accurate enough for fax machines. The military ones I worked on used a 
tuning fork oscillator to eliminate power frequency issues.

      Bruce Gentry, KA2IVY


On 4/25/19 2:53 PM, Nick England wrote:
> "The coming of television changed all of that."
>
> The NTSC TV standard introduced in 1953 is 59.94 Hz, not 60 Hz.
>
> Nick
>
> On Thu, Apr 25, 2019 at 2:25 PM Bruce Gentry via GreenKeys 
> <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>> wrote:
>
>
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