[sdiy] [OT reply][OT query] oscilloscope considerations

[Bob Roesler]

Bob,

I know I stand corrected, but I'm wondering...

Just what part of the video signal has a bandwidth of 4.1 Mhz? I've
heard/read this spec before, so I know you're right, but I've never
understood what it pertains to, always thinking that subcarrier was the
highest frequency added on top of the over luminance. If you could shed some
light, I'd appreciate it.

Thanks,
Bob


----- Original Message -----
From: "Bob Gonsalves" <pinknoiz at pinknoiz.com>
To: "Synth DIY List" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, January 07, 2002 11:00 AM
Subject: Re: [sdiy] [OT reply] oscilloscope considerations


>
> >  >frequency in american (NTSC) composite analog video is 3.58
> >>  (actually 3.579545 as I recall) Mhz. It is the subcarrier used to
encode
> >  > decode chrominance information.
>
> Though i'ts a moot point with regards to  'scope performance, NTSC
> video bandwidth is closer to 4.1 MHz, with a big old notch in the
> luminance signal around the subcarrier.
>
>