[mythtv-users] mythtv newcomer.. need help setting up live tv
papenfuss at juneau.me.vt.edu
Wed Oct 20 18:48:15 UTC 2004
On Wed, 20 Oct 2004, Evan Burrows wrote:
> I appologize to everyone for looking nieve I am just new to this stuff
> and i appreciate the help that you guys are giving me.
> I'm afraid the term "coax cable" is so vague it's meaningless.
> What is that "coax cable"? Is it composite video, modulated RF
> with NTSC on channel 3, analog audio, digital audio, what?
You have a right to be confused... "coax cable" has so many
potential meanings in this context that it's fairly worthless. All it
really means is how the cable is physically constructed... i.e. with
"co-axial" conductors. Round hollow conductor, with another conductor
down the middle. It generally is termed to distinguish between older
"flat" conductors (300 Ohm in US). The end you put on the cable is
irrelevant WRT the "coax" part, but it actually determines the signal on
it. Here's a few possibly options for "coax"
Analog (RCA-style connectors, usually red/white)
Digital a.k.a. "SPDIF" (RCA-style connector, usually black)
FM radio (F-style connector. FM-audio on RF signal)
Composite (RCA-style connector, usually yellow)
Y/C a.k.a "S-vid"(two coaxial cable internally, but 4-pin mini-DIN
Component (RCA-style connectors. Three (Y, Pb, Pr))
RGB (RCA or BNC-style connectors. Three (R, G, B))
Broadcast (F-style connector. Channels spaced for broadcast)
Cable TV (F-style connector. Channels spaced for cable
RF-modulated digital datastream:
Broadcast HDTV (F-style connector. 8-VSB modulation)
Digital cable (F-style connector. Usually QAM modulated with or
Satellite (F? BNC? N? TNC? Don't have one so don't know)
Any of those (with the possible exception of S-vid, but probably
some more I'm not recalling) can be and often are referred to as "Coax."
See... clear as mud.
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