kc8kfg said:
I can just see this being a nightmare, somehow. AFAIK, it's only 12, 16, and 26 around Cincinnati/Dayton that are going back to their original frequency?
Read Trip's response. He's absolutely right: no ordinary viewer will ever know or care about channel remapping. I've answered dozens of viewer emails about the DTV transition (and a handful of phone calls) -
no viewer has ever expressed any confusion over this.
Let me take a few bytes to reiterate something I've posted to a different thread.
WHIO-TV does not broadcast on "channel 7". There is no such physical concept. Right now, WHIO-TV is broadcasting an analog video signal on 175.25MHz.
Your analog TV contains a "lookup table". When you punch in "07" on the remote, your TV checks this table. It cross-references "channel 7" to 175.25MHz. It tunes to 175.25MHz, and it finds WHIO-TV's analog signal there.
Your digital TV also contains a lookup table. When you punch in "07" on the remote, your TV checks this table. It cross-references "channel 7" to 632.31MHz. It tunes to 632.31MHz, and it finds WHIO-DT's digital signal there.
The lookup table in your analog TV was programmed in at the factory. (the figures appear in the FCC regulations)
The lookup table in your digital TV was created when you scanned for channels.
Your digital TV (or converter box) forced you to do this channel scan when you first turned it on. Once it's done that scan and loaded the lookup table, you never have to mess with it again. It behaves
precisely the same way as the lookup table in your analog TV.
I don't know enough about the PSIP system, but is it possible for broadcasters to use two virtual channels simultaneously, for example, WHIO decicing to go with the NewsCenter 41 imaging (which most likely won't happen without a word from the FCC), and the virtual channel 7.1 just takes them to virtual channel 41.1, and leaving 7.1 active for 3 months or so, giving viewers time to adjust?
I don't know offhand of a technical reason you couldn't create two TVCT entries pointing at the same set of elementary streams but containing different virtual channels. It would however be illegal, as a violation of the ATSC PSIP standard which is incorporated by reference in the FCC regulations. (violations do exist)
Even if it were legal, it would be to WHIO's disadvantage to do it. It would confuse the viewers and throw away 60 years of identity. It would be like WHIO Radio deciding to change their call letters to WZMF.
*or whenever they do decide to pull the plug on the analog. I'm not sure if their date is final yet.
WHIO-TV is on the list of stations that filed to sign off their analogs on the 17th. However, so are the other three Dayton major-network affiliates. And because of that, the FCC put all four stations on a list released yesterday of stations that will have to meet additional criteria to be allowed to sign off on the 17th. ISTR one of those criteria involved at least one Dayton analog remaining on the air until April 17th with transition information and local news.