Originally Posted by moolala
I added a nearby channel that was OK originally so I knew I was doing it correctly....it is channel.43 which until the reset had been remapping in the guide to ch.17 which is indeed it's analog equivalent......upon the manual addition though, there was no mapping effort done and the channel instead appears in the guide as 43-1,2,3 (with no program info as expected)....I wasn't expecting this as I thought the channel mapping info is in the broadcast of the digital channel, when now it seems to suggest that it is xrefing against info DirecTV loaded ?!?!
of your conjectures are correct. The tuner will remap to the analog channel number (with -1 etc.
appended) if it receives a PSIP data block from the broadcast station (in the ATSC data stream) OR
if it receives "PSIP equivalent" remapping info from the DirecTV Advanced Programming Guide (APG). Since you have decided to "configure out" the OTA local channel info in the DirecTV APG (you did this by omitting the zip code in the "local network" option), your only source for remapping is the PSIP.
In the early days of HDTV broadcasting (late 1990s) very few stations sent the PSIP remapping info. Some of the early OTA HDTV tuners handled the remapping badly when it was
sent (and early on, the format of the PSIP varied somewhat, depending on the brand of digital encoder being used by the broadcaster). Some early HDTV tuners actually crashed when they received what they considered to be a badly-formatted PSIP!
By now, most of these kinks have been worked out, and most digital stations are
sending PSIP remapping info. Apparently, your local channel 43 is one of the few that still do not. (DirecTV tends to send their own remapping info whether or not the local station is doing so itself.)
This all gets even more interesting on occasions when the local channel makes changes in their digital "subchannel" configuration (adding more subchannels or dropping some). DirecTV tends to lag behind it often takes them several weeks to update the APG to match changes in local configurations. In that case, if you have the APG "local networks" option turned on, you sometimes see strange things, such as duplicate subchannels or subchannels that do not exist.
(You cannot turn off the broadcasters' PSIP remapping. Either they send it, or they don't.)
Most likely your father's tuner can receive the Canadian HDTV channels but it has been designed to ignore them (they may be "local" but they are definitely "out-of-market"). To receive them, he will probably have to cross the border and bring home a Canadian model of a terrestrial (OTA) HDTV tuner.