[ILUG] No Limits ? - No Service !

[Jerry Walsh]

http://www.hugebiceps.com/support/pal.html

Jerry.


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
>says "rubbish".
>
>Later,
>Kenn