opposite of an RF Modulator?
in [Repair]
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From: David Brodbeck on 20 May 2010 13:37 On May 20, 6:52 am, AZ Nomad <aznoma...(a)PremoveOBthisOX.COM> wrote: > it's called a tuner I used to use a VCR as a tuner in my TV projection setup. Worked pretty well. I bet an old VCR with a busted tape transport can be had pretty cheaply these days.
From: Jim Yanik on 20 May 2010 14:36 "William Sommerwerck" <grizzledgeezer(a)comcast.net> wrote in news:ht3f3e$jpu$1(a)news.eternal-september.org: > I think this is a troll, but... > > To make a long story short... Almost all TVs have inputs for analog audio > and video. By that I mean "baseband" (not RF) signals, such as composite > NTSC or component 1080p. With high-quality cabling, you should be able to > run these signals to multiple sets. > > > I don't know if those outputs are made to drive -multiple- sets. I believe they are only 1:1. They still require impedance matching,too. -- Jim Yanik jyanik at localnet dot com
From: UCLAN on 20 May 2010 14:48 mm wrote: > Does there exist the opposite of an RF Modulator? Something that will > take RF and turn it into digital for a digital tv? Well, a RF *demodulator* takes analog RF and converts it to analog A/V. A A->D converter will convert that to digital. > Can I convert the analog back to digital for the digital tvs? A A->D converter will do the trick. $$ for video. Question: For the digital TVs, why not just use the original digital signal?
From: David Nebenzahl on 20 May 2010 15:05 On 5/20/2010 11:36 AM Jim Yanik spake thus: > "William Sommerwerck" <grizzledgeezer(a)comcast.net> wrote in > news:ht3f3e$jpu$1(a)news.eternal-september.org: > >> I think this is a troll, but... >> >> To make a long story short... Almost all TVs have inputs for analog audio >> and video. By that I mean "baseband" (not RF) signals, such as composite >> NTSC or component 1080p. With high-quality cabling, you should be able to >> run these signals to multiple sets. > > I don't know if those outputs are made to drive -multiple- sets. > I believe they are only 1:1. > > They still require impedance matching,too. Just curious: what *is* the impedance of such cables? I'm guessing it's not the 50 or 75 ohms of RF cabling. -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com)
From: Michael A. Terrell on 20 May 2010 18:31 David Nebenzahl wrote: > > On 5/20/2010 11:36 AM Jim Yanik spake thus: > > > "William Sommerwerck" <grizzledgeezer(a)comcast.net> wrote in > > news:ht3f3e$jpu$1(a)news.eternal-september.org: > > > >> I think this is a troll, but... > >> > >> To make a long story short... Almost all TVs have inputs for analog audio > >> and video. By that I mean "baseband" (not RF) signals, such as composite > >> NTSC or component 1080p. With high-quality cabling, you should be able to > >> run these signals to multiple sets. > > > > I don't know if those outputs are made to drive -multiple- sets. > > I believe they are only 1:1. > > > > They still require impedance matching,too. > > Just curious: what *is* the impedance of such cables? I'm guessing it's > not the 50 or 75 ohms of RF cabling. They have to be made to drive a 75 ohm load to work with a standard video input. If you can turn off the 75 ohm termination in all but the last monitor, you can drive multiple monitors. I used the tuner & power supply from a damaged VCR 20+ years ago as a secondary demodulator at the TV station I worked at. I looped it back into a spare input on the 3M video router so the director could see what our views saw, instead of our in hose video. That cost be $2, instead of over $3,000 for a commercial demodulator like the one we used at our transmitter site. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
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