From: Alan Pearce <kiwiantipodean@googlemail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sender: "piclist-bounces@mit.edu" <piclist-bounces@mit.edu>
Date: Thu, 26 Nov 2020 11:07:25 -0800
Subject: Re: [OT] Hyperikon Retrofit LED Tubes Without Ballast and
 fluorescent	lamps and TV!
Thread-Topic: [OT] Hyperikon Retrofit LED Tubes Without Ballast and
 fluorescent	lamps and TV!
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> Also, thanks for clarification on PAL. I had only read about it and had n=
o
> experience with it.

You are welcome. Thinking about it after sending I have a feeling that
the colour burst is +/-45 degrees on the required colour subcarrier
oscillator phase.

But you were correct, each alternate line does have the colour phasing
reversed. See https://en.wikipedia.org/wiki/PAL for a description of
the development and theory of PAL.


On Thu, 26 Nov 2020 at 16:48, Harold Hallikainen
<harold@mai.hallikainen.org> wrote:
>
>
> >> NTSC television is interesting! It's described at
> >> http://mai.hallikainen.org/org/FCC/FccRules/2021/73/682/ . Prior to
> >> color,
> >> the field rate was indeed 60 Hz, the power line frequency, to avoid
> >> rolling "hum bars." With color, it appears everything is based on a
> >> precise 5 MHz with the chroma subcarrier being 5 MHz * 68/88.
> >
> > That would be 3.863636 MHz, not even close to the correct value.
> >
>
> Oops! Typo. Copied from cited FCC rule, it's 63/88 * 5 MHz.
>
>
> Also, thanks for clarification on PAL. I had only read about it and had n=
o
> experience with it.
>
> Harold
> https://w6iwi.org
>
>
>
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com
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