gar fla said:
They say our channels 3 and 38 here in the Tampa/St. Pete area went digital. I just got out my little hand held 2" LCD TV that I keep with my storm emergency kit to see. 3 and 38 no longer exist. I got a sad feeling too. Change has been a good thing when it came to things like CDs, DVDs, and wireless phones but I just don't see this the same way. I don't see why this has to be mandatory.
We've been operating a dual analog/digital broadcast system in the US for 11 years now, believe it or not.
It can't last forever, and here's why:
The primary impetus behind the conversion to DTV came not from broadcasters but from wireless providers and emergency first responders. They've long coveted some of the huge chunk of UHF spectrum that was once reserved solely for broadcasters. In the eighties, channels 70-83 (806-890 MHz) were removed from the TV spectrum and handed over largely to cell phones.
But there was no way, with the relatively inefficient spectrum use of analog TV, to keep the existing number of stations on the air and reduce the TV broadcast spectrum (now 470-806 MHz, channels 14-69) any further. Nor could wireless/2-way users coexist with analog TV on the existing TV broadcast spectrum.
Enter digital TV - because digital signals can operate on adjacent channels and other "taboo" channels in a way analog channels can't, it became possible to "re-pack" the TV spectrum into less space - channels 2-51, freeing up channels 52-69 (700-806 Mhz) to be sold (in part) to the highest bidder, and given away (in part) for emergency agencies to use to improve their communications.
That re-packing process, and the vacating of channels 52-69, cannot be completed until analog TV goes away, since some DTV signals have been operating up in those upper channels for lack of space in the remaining "core" spectrum. (In Tampa, for instance, the digital signals for channels 3, 10, 38 and 44 all move to channels now occupied by analog signals at the end of transition.)
Even if there were some magic way to give every station two channels (one for digital, one for analog) within the post-transition core spectrum (channels 2-51), you still couldn't do double operation forever. TV stations have been spending VERY large sums of money to keep two signals on the air for quite a few years now, at no benefit to their bottom lines, and they're not going to expend any more money at this point to keep dying analog transmitters maintained and operable. (In a lot of cases, it's literally impossible to even get replacement parts for the older analog transmitters.)
In short, while the transition to DTV may seem like a recent development, it's actually a very complicated, intricately-planned dance that was set in motion as far back as 1996, and it's progressed way too far now for it to be possible to turn back.
You'll notice that I haven't even mentioned anywhere in here the benefits to viewers from DTV multicasting or widespread adoption of HD programming via DTV. Those were never the real intent of this transition. The goal, initially, was to raise money for the Federal budget by selling off the upper end of the UHF spectrum, and that's been accomplished. Everything else is a fringe benefit (or downside, as the case may be.)