Yeah, but as great as digital TV may sound we had ALL KINDS of trouble with it over a 12 month trial period here from our cable provider and finally we gave up.
It was constantly going bad, de-synchronising the audio and video or stuttering or stopping completely. Also, it took several seconds to change channels every time. What a hassle! I hated digital TV! We dumped digital cable and went back to analog. > Steve is correct. > > The modulation is linear with 8 level vestigial sideband transmission > (the carrier( at -11 dB from peak sideband power) is only .3 Mhz from > the lower edge of the channel) and uses a 3-2 data rate allowing a > 19.39 megabit data stream to be sent in a 6 mcs bandwidth > channel. That channel can contain an eclectric mix of video, audio, > data with high quality audio channels up to near 20 kcs bandwidth > each. The present system is very inefficient, the AM video modulates > only 87.5% negative while the sync and 1/2 the color burst modulate a > maximum of +15% positive. Even the audio is 25 kcs deviation as > compared to the75 kcs used in bcst FM radio with the resultant lower S/N in > TV. > > Here is a good link. > > It was definitely time for a change and the large screen multichannel > audio system here proves it. I basically have a movie theater for TV at home. > > Like it or not the world is going digital (modulation) but actually > the digital TV transmitter is a linear AM system. > > Larry > W3LW > > At 05:00 PM 10/13/2007, you wrote: > >[EMAIL PROTECTED] writes: > > > > > The spectral footprint of the analog station is going to be reduced from > > > 6MHz down to around 200kc... and there are already some stations in San > > > Antonio that are broadcasting in Digital, with channels like (channel 4 > > > being the 'main') 4.1, 4.2, 4.3, etc... > > > >I don't think so. HDTV takes up the full 6 MHz channel for one giant data > >stream. That data can be multiplexed, divided, into more channels, > >IF you don't > >want it to be high-resolution. The overall spectrum savings, as I understand > >it, comes from rearranging the stations' channel assignments to better "pack" > >them in. > > > >Steve WD8DAS > > > > > > > > > >************************************** > > See what's new at http://www.aol.com > >______________________________________________________________ > >Our Main Website: http://www.amfone.net > >AMRadio mailing list > >List Rules (must read!): http://w5ami.net/amradiofaq.html > >List Home: http://mailman.qth.net/mailman/listinfo/amradio > >Help: http://mailman.qth.net/mmfaq.html > >Post: mailto:[email protected] > >To unsubscribe, send an email to [EMAIL PROTECTED] with > >the word unsubscribe in the message body. > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
