At 11:28 01/05/01 +0100, Kenn Humborg wrote:
> > >On Tuesday 01 May 2001 10:51, Jerry Walsh wrote:
> > > > PAL is 50hz, it's based on the hertz of the a/c coming into your house
> > > > which in Ireland is 50hz.
>>Sounds like dodgy reasoning to me... The 50Hz mains is not
>a constant 50Hz, but varies slightly (as much as 0.5Hz under
>extreme conditions) as generation and demand rise and fall.
>>It wouldn't be much use to a TV as a reference signal for
>at least two reasons:
>> 1. As mentioned, it varies.
> 2. It won't be in phase with the frames in the received
> TV signal.
>>Of course, I'm willing to be proven wrong (URLs to trustworthy
>sources would be nice), but the electronic engineer in me
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