[BC] Lower Vestigial sideband...

[Burt I. Weiner]

The visual carrier is Vestigial and, as I recall, must be attenuated 
by 40 dB or more at -.1.25 MHz, the lower edge of the channel.  The 
upper sideband has to protect the color subcarrier's lower sideband 
which extends approximately -600 kHz plus guard band (down) from the 
color subcarrier itself and as a result leaves only about 3.2 MHz for 
the luminance channel.

Burt

At 10:00 PM 6/3/2006, you wrote:
>From: PeterH5322 <peterh5322 at rattlebrain.com>
>Subject: Re: Re: [BC] CBS Color...lived on
>To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
>Message-ID: <200606040426.k544Qi7W046006 at mail.cruzio.com>
>Content-Type: text/plain; charset="US-ASCII"
>
>
> >And therein lies another possible source of confusion: Because
> >fully-compliant NTSC resolution can be better (and is, in the studio
> >before transmission), the real limitation is indeed the transmission
> >medium (over the air and cable), a bandwidth restriction imposed by
> >the 6 MHz analog broadcast channel. Before it hits the transmitter,
> >NTSC video can actually look pretty damn good.
>
>The lower sideband is not bandwith limited, wereas the upper sideband is
>bandwidth limited so as to accommodate the FM audio, which is 4.5 MHz
>above the AM video carrier.

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at earthlink.net
K6OQK