[Scan-DC] Digital tv/radio

[Jeff Krauss]

It's not exactly correct that 8VSB performs poorly in mobile environments.
The new ATSC Mobile DTV standard operates within the existing 
8VSB-modulated signal, albeit with additional error correction coding 
and extra training sequences to assist reception under high Doppler 
rate conditions.  More information here:
http://www.atsc.org/communications/newsletter/2008_december_standard_web.pdf
and here:
http://www.atsc.org/standards/candidate_standards.php
http://www.atsc.org/standards/cs_documents/a153/S4-131r11-A153-Part-2-RF-Transmission.pdf



>------------------------------
>
>Message: 4
>Date: Wed, 4 Feb 2009 22:07:18 -0500
>From: "Andrew Clegg" <w4jecom at w4je.com>
>Subject: Re: [Scan-DC] Digital tv/radio
>To: <scan-dc at mailman.qth.net>
>Message-ID: <EOEEKJOEEAGMBNCILONKAEGDCBAA.w4jecom at w4je.com>
>Content-Type: text/plain;       charset="US-ASCII"
>
>One of the problems with the 8VSB modulation used in the ATSC digital TV
>standard is that it apparently performs very poorly in mobile environments.
>This may mean that even if a portable audio receiver ever becomes available,
>it may not work that well in a car, on a train, or in other mobile
>environments.
>
>A short and slightly old blog entry on the mobile performance issue is at
>http://tinyurl.com/al2ukh (but the issue is still valid since the modulation
>has not changed).
>
>I realize this doesn't help your friend, but it's clear that the issue of an
>affordable portable DTV audio receiver is probably more complicated than he
>or she thought.
>
>Cheers,
>Andy
>