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What messes up channel assignments?

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Old 01-23-2010, 06:10 PM   #1
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Default What messes up channel assignments?

I'm in Los Angeles.
A few months ago, channel 56.1 disappeared from my Sharp TV. I had to rescan to pick it up again.
Today, after weeks of receiving a Spanish language broadcast on channels 50.1 and 50.2 on my Sony TV, I realized I was still getting English PBS broadcasts on those channels on my other TVs. I had to do a full scan to set it right again. How does this happen?
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Old 01-23-2010, 06:36 PM   #2
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If you look at the set up guide for your television, you will find that since the television is digital that it carries the programming in more then one language.

Because you are there and I am here, I do not know who is in your household, or if you live alone. But my guess is that someone hit the wrong button on the remote control and you programmed your television to show that channel with the Spanish instead of English audio. Or they did some upgrades and you temporarily lost the English audio and the television substituted the Spanish and you did not know enough to switch it back. Maybe you have little kids in the house or maybe the cat walked across the remote control or maybe someone is breaking into your house and watching your television while you are not home. Anything is possible.

We had a guy locally, who lived in a duplex and did not pay his rent. When the landlord went to evict him, he moved up into the attic and went into peoples apartment's and ate their food and watched their televisions while they were not home. The only reason they caught him was because he stole some little kids video game and was up in the attic playing it and the little kid could not find his video game and the tenants realized that other things were missing and called the polelease.
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Old 01-23-2010, 07:38 PM   #3
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It wasn't Spanish language audio of the same program, it was a completely different station! At first I thought it had to do with the set being on a different antenna than the one that was picking up correct station, but then I checked my DVD recorder (with a build in digital tuner) on the same antenna, and it was picking up the correct station. That's when I decided to do the rescan that fixed it. I would have noticed it picking up a different station than my other sets weeks ago, but I thought that the station had just changed formats, so I didn't bother tuning to that channel on the other sets (I missed a lot of This Old House episodes )
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Old 01-23-2010, 08:31 PM   #4
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Digital broadcasting is more complex than analog was.

There is a multiplexed signal put into the stream that tells your tuner which virtual channel to display and which frequency it is found on.

When the computer that generates this PSIP data starts acting up, often the tuners will not be able to associate the virtual channel with the real channel.

Stations often do not notice that this is happening for some time, so stations disappear and a rescan picks them up either on the virtual channel or on the RF channel.

The first thing to do when a station suddenly disappears is to call the station and let them know. They will probably tell you all is well with their signal, then go fix the problem and your station might come back or you may indeed have to rescan.
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