[BC] Lower Vestigial sideband...

[DANA PUOPOLO]

If you've never seen it before, you would be amazed at how much quality is
lost going through the average NTSC transmitter. You'd be more amazed seeing
how much quality is lost in Dish TV's 'digital' transmission!

-D



------ Original Message ------
Received: Sat, 03 Jun 2006 10:30:26 PM PDT
From: "Burt I. Weiner" <biwa at earthlink.net>
To: broadcast at radiolists.net
Subject: [BC] Lower Vestigial sideband...

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 



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