I misspoke, either modulation system requires increased C/N to handle multipath. > -----Original Message----- > From: opendtv-bounce@xxxxxxxxxxxxx > [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Dale Kelly > Sent: Wednesday, July 04, 2007 3:20 PM > To: opendtv@xxxxxxxxxxxxx > Subject: [opendtv] Re: DTT tuner design > > > Bert wrote: > > Wait, wait, Frank does make an interesting point. Just what did the FCC > > assume to create its DTT coverage contours, compared with other > > RF services? > > I was too lazy to ferret out the cell phone or DBS assumptions > > Frank wonders > > about, but I knew right where to go for the French TNT system. > > I fail to see the purpose for studying cell phone or DBS assumptions and > link budgets are already understood - made more difficult/dynamic for 8VSB > multipath demodulation. We all know well the FCC assumptions (planning > factor) for obtaining desired DTV coverage and the propagation of > television > signals has been extensively studied and understood. Unfortunately the CE > folks failed to honor these assumptions and under pressure, adopted A74, > which is also deficient in certain critical areas. However, my BS > remark was > as much aimed at Frank's very weak analogy as anything else.... > > You simply went for the CE's "obfuscation method #1", (as have I) > which they > typically use whenever an improvement or change is requested at ATSC and > other venues. The current body of work is seldom acceptable and detailed > studies and/or field testing is requested before any further > consideration. > I could give examples but am unable to per CA. > > On the other hand, your comparison to the TNT system is excellent and > worthwhile and your conclusions make sense, though they were not actually > needed for the current discussion, IMO. > > BTW, I do have a hard copy of OET69. > > Dale > > > > > ---------------------------------------------------------------------- > 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. > > ---------------------------------------------------------------------- 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.