On Mar 12, 7:49*am, "Ed Pawlowski" wrote:
"mm" wrote

I thought that letting a VCR or DVD recorder or TV scan for channels
was only to compile a list in advance of stations a device
could receive, by checking out every channel and noting which had
signals.

Right, that is usually a one time deal and then the TV has a memory of those
channels. *You can usually edit the channel listing also. *By eliminating
the ones you never watch, the TV will skip over them when you hit the UP or
DOWN buttons.



And that pushing 1 3 on the remote would go to channel 13 whether one
had scanned for channels or not, whether digital station frequencies
had changed since the last time one scanned or not.

Yes

*As effectively as

if one scanned the whole spectrum, and then channeled up or down to
get to 13.

Am I right about the paragraph just above?

Yes



And that for timed recording, when the dvd recorder goes to channel 13
directly, it looks for it if necessary, just like scanning does.

Don't think so. *It will go to 13 but it won't scan looking for it AFAIK

*And

if it gives some reception, though bad reception, even though the
transmitter is only 10 miles away, it's not because it's off
frequency? *But because the signal is bad.

I don't have OTA so I'm not going to comment



Or are digital tuners different from analog, in that scanning first
and whenever the channel frequency changes is essential?

Why would the frequency change?

I think it may vary depending on the particular tuner implementation.
Some might not accept a direct channel entry from the remote
without that channel having been recognized previously during
a scan. Others might accept any channel entry, even one that
you don't have and attemp to tune to that channel.