On 03/12/2011 02:47 AM, mm wrote:
I know all the differences between analog and digital tuning in
general, just not what happens when one enters 1 3, for example, on
the remote.

What is the difference between scanning for channels and going
directly to one?

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.

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. 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?


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

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

Thanks.

Well, if you input channel 13 and there is a "Channel 13" in memory, it
will go to that channel. If there's not, it will go to true RF channel
13 generally.

http://en.wikipedia.org/wiki/North_A...on_frequencies
http://en.wikipedia.org/wiki/Virtual_channel

when we did the DTV transmission, the channel as it appears on your
display no longer necessarily - and usually doesn't - conform to the
actual RF channel on which the signal is being broadcast.

for instance, this is the results of a search from antennaweb.org

DTV Antenna
Type Call Sign Channel Network City, State Live
Date Compass
Heading Miles
From RF
Channel
* yellow
uhf WNVC-DT 30.1 IND FAIRFAX, VA 261° 2.3 24
* green
vhf WUSA-DT 9.1 CBS WASHINGTON, DC 62° 7.1 9
* green
vhf WJLA-DT 7.1 ABC WASHINGTON, DC 62° 7.1 7
* red
uhf WHUT-DT 32.1 PBS WASHINGTON, DC 62° 7.1 33
* red
uhf WFDC-DT 14.1 UNI ARLINGTON, VA 66° 6.6 15
* red
uhf WDCA-DT 20.1 MNT WASHINGTON, DC 58° 7.3 35
* red
uhf WTTG-DT 5.1 FOX WASHINGTON, DC 58° 7.3 36
* red
uhf WPXW-DT 66.1 ION MANASSAS, VA 62° 7.1 34
* red
uhf WRC-DT 4.1 NBC WASHINGTON, DC 66° 6.6 48
* blue
uhf WETA-DT 26.1 PBS WASHINGTON, DC 62° 7.1 27
* blue
uhf WDCW-DT 50.1 CW WASHINGTON, DC 68° 9.9 50
blue
uhf WMDO-CA 30 TFA WASHINGTON, DC 65° 6.0 30
* blue
vhf WMDO-LD 47.1 TFA WASHINGTON, DC 66° 6.6 8
* violet
uhf WNVT-DT 30.6 IND GOLDVEIN, VA 229° 22.5 30

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