Originally Posted by contactjj
Gopher In Heat, thanks for your reply.
I understand the signal travel part. But Samsung and a couple of Panasonic 2006 HDTV sets I randomly pickup have following specs:
8VSB (terrestrial): ATSC compliant 8VSB
QAM (cable): ANSI/SCTE 07 2000
Terrestrial (analog): 2-69
Cable TV (analog): 1-135
Terrestrial (digital): 2-69
Cable TV (digital): 1-135
What do above numbers mean? Without set-top-box, it is the TV tuner's job to synch and decode the signal. I have no doubt that you and Numbers Nerd can receive those channels (>135) over analog cable services. In my area, these channels are in the range of 309+. Could the newer models step backwards and need set-top-box for high numbered channels?
OK, here is my understanding of it - I could be totally wrong, but I am only giving my answer because noone else has stepped in yet. In fact I know basically nothing and probably am wrong, but here is my "wrong" understanding:
When you see an analog TV channel number, the channel is actually on that number, which corresponds to a particular frequency in the VHF/UHF spectrum. But when you see a digital TV channel number, the channel is NOT actually on that number, because DTV is on a different frequency band than analog.
For example, in our market, we have analog TV channels 4, 6, 10, 12, and so on, which correspond to particular frequencies. Those channels all have their own digital counterparts - 4-1, 4-2, 6-1, 10-1, and so on. But the channel 4-1 you see on your HDTV set is not "actually" on DTV channel 4 - it might be on DTV channel 21 or whatever, but it SHOWS UP as channel 4, in order to correspond with the analogs (so that people don't have to memorize a whole new set of channel numbers when they switch to DTV). Another example, when I run a channel scan on my HDTV STB, the channel numbers it finds during the scan are not the same channel numbers that I end up seeing. The other day, I was having trouble pulling in 12 (WISN), and my STB kept stalling at channel 46 or whatever it was (WISN's "actual" channel number on the DTV spectrum).
My understanding is that ALL DTV tuners, however old or recent, are capable of tuning in ALL DTV signals over either 8VSB or QAM, no matter what the "abstracted" channel number, and that all "actual" QAM DTV channels are within channels 1-135, even if some of them happen to show up as 352-6 or whatever.
I hope this makes sense. Again, it could be totally incorrect. But I would be very surprised if some recent model sets have actually DROPPED the ability to tune in a portion of the DTV spectrum.