Fun with VCs
(I really wish we could still put titles on posts… -sigh- )StevenJB
All 12 MHz channels are online already, and have been since August 1, just as previously reported and documented at the web address I gave in my first post on this subject.
So let’s take this by the numbers…
Originally Posted by StevenJB
You better replace your equipment. 30.11 clearly shows a Physical Channel of 24 on my diagnostics screen. I own two top quality Sony XBRs.
Ok, point 1: never pontificate about PSIP based on data from a single manufacturer’s tuners. Even if you have two different models, they probably use the same or very similar algorithms to populate their virtual channel tables (VCTs) so any idiosyncratic/erroneous behavior will manifest identically on both.
They both have diagnostics programs for each digital channel. Both Sonys clearly show Channel 24 for the Physical Channel for 30.11. The signal level is 84-87 and which is exactly the same as 30.1 through 30.5.
I don’t own a Sony, but here’s a plausible explanation:
Start with VC 30.1-30.5 on RF24, 30.6-30.10 on RF30.
The station moves 30.6 to RF24 and adds VCs 30.11 and 30.12 to RF30.
You tune your set to a VC it thinks is on RF 24, and the tuner learns about the new subchannel with VC 30.6.
But not having tuned RF 30, the tuner still thinks VCs 30.6 – 30.10 are in use on RF 30.
Now at this point, some tuners, such as my TiVoHDs and Insignia CECBs, would simply add a second VC 30.6 to the VCT for the new RF 24 sub.
But other tuners, like my Dish CECB (made by CM, iirc) and apparently, your Sonys, want all VCs to be unique, so they create their own internal/fake VCs for the new/duplicate sub. The Dish/CM box actually creates a fake major number as well, so I had a VC 70.6 for a while on that box until I cleaned it up.
But the Sonys, apparently, simply counted up from 30.6 to the first available/unused VC, which, again, because they didn’t yet know about the changes on RF 30, was 30.11.
And thus you ended up with a 30.11 label for what was supposed to be 30.6.
Originally Posted by StevenJB
My apologies to you. I spoke to soon. I just did a rescan and 30.11 is back on Physical Channel 30. My bad.
My rescan confirms that 30.6 is not putting out any PSIP data. That causes it to default to its physical channel which is 24.6.
So either you chose, or the Sony software defaulted to, a non-destructive scan, meaning the VCT was not actually cleared and fully repopulated, but simply scanned for new channels to be added.
The scan would have hit RF 24 first, with the same results as above, but when it later hit RF 30 and detected the new VCs 30.11 and 30.12, the software gave priority to the “real” 30.11 over its internally generated “fake” 30.11.
If the software were really smart, it might have looked at RF 24 again, or generated a new fake VC for the displaced RF24 sub, but probably the authors didn’t feel like writing an AI program just to populate a VCT, so they simply left the fake 30.11 “orphaned”, and thus accessible only via it’s real RF, as 24.6.
My guess would be that VC 30.6, if it’s there at all, is still stuck pointed at RF 30, whether the diagnostic screen reveals that or not, but because the real sub ID that it points at is no longer there on RF 30, all you can get is a black screen.
It appears that there will be 12 channels now instead of 10. Once 30.6 goes back on line it will switch to 24 from 30. That means that 30.1 through 30.6 will use 24 and 30.7 through 30.12 will use 30. Just my two cents worth.
Again, all the channels are online already.
Your mission, should you choose to accept it, is to get your Sonys in sync with the rest of the world.
If the rescan actually removed the old 30.6 from the VCT when it hit RF 30, a second rescan may be all you need to do to find the new one.
Failing that, if the Sonys have an option to add and delete individual channels, I suggest you individually delete all the VCs associated with RF 24 and 30, then unplug your TVs for a minute or two, and then rescan.
Or if you chose an incremental scan, or a scan for new channels only, try a full rescan to delete and repopulate the whole VCT.
If all of that doesn’t get you all 12 MHz channels on the proper VCs, you may have no choice but to do as I’ve occasionally had to do on my “top quality” Panasonics, i.e. do a factory reset and start over.