Originally Posted by veedon
Yes. Somehwere in Directv's darkest corner, someone made a list of subchannels to add to the AM21. Originally, it was intended to be a quick way to get many customers HD locals in areas where Directv had not added HD locals yet. Of course, anyone could buy one. All markets are in the database, most primary full-power locals, and subchannels that have always been there (not sure when they stopped updating). Low Power channels are only included most of the time if they are a major network. The list of the OTA subchannel database is on DBStalk.
These are missing on mine:
22-2 Zuus Country (although sometimes an incorrectly entered UNC station appears instead)
40-2 Unimas HD (this was in the database until this past Saturday. Now, it's gone...)
43-3 TCT Kids
I run the AM21 with my home zip (Greensboro DMA) and second zip (Raleigh DMA). Then, run it again with Roanoke VA DMA zip and Los Angeles. Los Angeles adds most of the missing channels. You get guide data for the wrong channel, but you can at least manually record from the channel. Then I run the initial set again with Salt Lake City and Fresno, CA. Then finally again with Greensboro and Raleigh. RF and PSIP can mess with it a little. Example: KTBN LA is RF 33, like WMYV Greensboro so KTBN shows on 48-2. Since WMYV 48-1 is in the database, that channel does show correctly. Forcing as few zips as possible makes it mess up less. I don't always have that many.
Note: I have learned that if you force zips and leave two forced zips as the last run, those are the final two markets that will default after a power outage, reset, software update. With channels 2, 5, 11, 22, 40, etc in my regular lineup, All LA guide data would show up. To fully reset an AM21 is a true pain, but I finally got it to how it like it.
I highly recommend anyone with Directv go get the AM21 but just keep it basic with the two zips. It's a great way to get most subchannels and locals during storms. For those of us who like to tinker, the AM21 can give something to tinker with, especially fpr you with other markets nearby in the Charlotte area.