This is a well written article, which explains what must be achieved to meet A/74 with a front end that is also cable ready. The article only talks about the tuner, i.e. analog RF front end design considerations. http://www.digitaltvdesignline.com/howto/showArticle.jhtml?articleID=3D17= 3 601582 Remember to remove the "3D" characters following any equals sign. Here's what they say about A/74: "Today, ATSC A/74(2) is only a 'recommended practice.' However, as U.S. consumer demand for over-the-air DTV and HD viewing increase, coupled with an aggressive government drive to reclaim analog spectrum, many believe it will become the de facto standard for quality ATSC receiver equipment." Count me among the "many believe." One comment is that the noise figure they estimate for a receiver that meets A/74 is 8 dB, (and the new Samsung ought to beat that by about 2 dB). They suggest a single conversion tuner with active image cancellation filter. I think this is the crucial part of the article: "Ideally the tuner should achieve a minimum image cancellation across its operation range of 72.5 dB and a minimum of 68 dB. This is extremely challenging using standard tracking filter techniques. To meet the requirement will either compromise the desired channel filter flatness or require additional tracking filter stages to achieve additional image suppression. Neither of these are desirable since the former may render the tuner performance unacceptable for other distribution means such as analog terrestrial or cable and the latter will involve additional design complexity coupled with increased manufacturing cost. These issues are potentially compounded when aging and temperature variation effects are considered. A solution overcoming these disadvantages is to apply active image cancellation within the tuner by using image reject mixer technology in the MOPLL section. With this approach it is feasible to achieve typically 30 dB of image suppression, which will ease the tuner tracking filter requirement to 42.5 dB. This helps lower manufacturing costs and is also far less susceptible to environmental aging." I'd be curious what others think about this. Bert ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.