opposite of an RF Modulator?
in [Repair]
|
From: PlainBill47 on 22 May 2010 15:12 On Thu, 20 May 2010 01:19:04 -0400, mm <NOPSAMmm2005(a)bigfoot.com> wrote: >Does there exist the opposite of an RF Modulator? Something that will >take RF and turn it into digital for a digital tv? > > >Details: >I don't need this yet but I'm trying to plan ahead. What will I do >when I have one or two digital tvs, but I'm sending analog to all the >tvs in the house? I don't have the energy anymore to install >homeruns from the DVDR to any tv but the one in the same room. All >the rest are in series ther. I don't have the energy to run RCA >cables for composite or component inputs. > >Right now, I use a DVDR and an RF modulator to take digital over the >air tv, detect it, and convert it to analog. and I send it to the 7 >tv's I have, one in each room, and maybe one for the deck too. After >some effort, with some help from you guys, this works fine. The attic >antenna goes to the DVDR in my bedroom and soon, I'll have a set-top >box too (and a Channelplus modulator outputing two inputs on separate >channels), so I can record one show and watch a second, while sending >the second throughout the house. > >I'm not going to buy 8 digital tv's at one time, and in reality, I'm >only going to get them one at a time over the next 10 or 20 years, >dpending on what I see at yard sales. > >So what will I do when I have one or two digital tvs, but I'm sending >analog to all the tvs? I don't have the energy anymore to install >homeruns from the DVDR to any tv but the one in the same room. All >the rest are in series. I don't have the energy to run RCA cables for >composite or component. > >Can I convert the analog back to digital for the digital tvs? Phrase your question properly and you will get better results. Google 'ATSC Modulator'. PlainBill
From: Dave Platt on 22 May 2010 20:54 >>So what will I do when I have one or two digital tvs, but I'm sending >>analog to all the tvs? I don't have the energy anymore to install >>homeruns from the DVDR to any tv but the one in the same room. All >>the rest are in series. I don't have the energy to run RCA cables for >>composite or component. >> >>Can I convert the analog back to digital for the digital tvs? >Phrase your question properly and you will get better results. > >Google 'ATSC Modulator'. Probably unnecessary. Almost all digital-cable TVs can receive and decode both ATSC (digital) and NTSC (analog broadcast/cable) signals. They can look at any proper 6 MHz slice of the broadcast spectrum, look at the signal in that range, determine whether it's NTSC or ATSC, and display it properly. You can mix NTSC signals (e.g. the "channel 2/3" modulated output from a VCR or DVD player) with ATSC digital, as long as you don't try to put both on the same channel. The best way to do this is with a proper single-channel combiner. You ought to be able to arrange a setup which takes your incoming antenna signal (which will consist almost entirely of ATSC signals), buffers/amplifies it, mixes in a modulated NTSC signal from the DVDR modulator (on a channel not used for ATSC), and distribues this out to all of the TVs. Tune to an ATSC channel and they'll detect and decode the corresponding digital signal. Tune to the channel you're using for NTSC analog from the DVDR, and that's what they'll show. This will be *much* less expensive than trying to take the analog output of the DVDR, encode it into ATSC digital format, modulate it, and mix it onto the cable. The best video quality from the DVDR would be via HDMI (or component, or S-Video, or composite, in that rough order) rather than via modulated RF (which is often soft and blurry looking) but you'd need home-run cables from the DVDR and some form of distribution amp to do these. -- Dave Platt <dplatt(a)radagast.org> AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads!
From: Jeroni Paul on 23 May 2010 08:01 > Almost all digital-cable TVs can receive and decode both ATSC > (digital) and NTSC (analog broadcast/cable) signals. They can look at > any proper 6 MHz slice of the broadcast spectrum, look at the signal > in that range, determine whether it's NTSC or ATSC, and display it > properly. Not around here. Digital only TVs are starting to proliferate since analog TV is no longer broadcast, it makes little sense to pay for obsolete technology any more. They only have Scart inputs, so if you want to tune to VHF/UHF you will need an external analog tuner.
From: PlainBill47 on 23 May 2010 15:03 On Sat, 22 May 2010 17:54:35 -0700, dplatt(a)radagast.org (Dave Platt) wrote: >>>So what will I do when I have one or two digital tvs, but I'm sending >>>analog to all the tvs? I don't have the energy anymore to install >>>homeruns from the DVDR to any tv but the one in the same room. All >>>the rest are in series. I don't have the energy to run RCA cables for >>>composite or component. >>> >>>Can I convert the analog back to digital for the digital tvs? >>Phrase your question properly and you will get better results. >> >>Google 'ATSC Modulator'. > >Probably unnecessary. > >Almost all digital-cable TVs can receive and decode both ATSC >(digital) and NTSC (analog broadcast/cable) signals. They can look at >any proper 6 MHz slice of the broadcast spectrum, look at the signal >in that range, determine whether it's NTSC or ATSC, and display it >properly. > >You can mix NTSC signals (e.g. the "channel 2/3" modulated output from >a VCR or DVD player) with ATSC digital, as long as you don't try to >put both on the same channel. The best way to do this is with a >proper single-channel combiner. > >You ought to be able to arrange a setup which takes your incoming >antenna signal (which will consist almost entirely of ATSC signals), >buffers/amplifies it, mixes in a modulated NTSC signal from the DVDR >modulator (on a channel not used for ATSC), and distribues this out to >all of the TVs. Tune to an ATSC channel and they'll detect and decode >the corresponding digital signal. Tune to the channel you're using >for NTSC analog from the DVDR, and that's what they'll show. > >This will be *much* less expensive than trying to take the analog >output of the DVDR, encode it into ATSC digital format, modulate it, >and mix it onto the cable. > >The best video quality from the DVDR would be via HDMI (or component, >or S-Video, or composite, in that rough order) rather than via >modulated RF (which is often soft and blurry looking) but you'd need >home-run cables from the DVDR and some form of distribution amp to do >these. Only if you are willing to settle for 'less than analog boradcast quality signals'. Recall that anyone who compared the quality of the RF signal output of a VCR to the composite signal quickly decided that it was worth buying the composite cables. And a component connection offers even better performance. Also, unlike others, I do a little research. The last two DVD players I purchased don't even have RF outputs. One, a Toshiba, DOES have an HDMI output. Doing a little research, the ZvBox� 170 appears to do exactly what the OP proposed. Not surprising, that's what it was designed for. PlainBill
From: UCLAN on 23 May 2010 16:27 PlainBill47(a)yahoo.com wrote: >>The best video quality from the DVDR would be via HDMI (or component, >>or S-Video, or composite, in that rough order) rather than via >>modulated RF (which is often soft and blurry looking) but you'd need >>home-run cables from the DVDR and some form of distribution amp to do >>these. > > Only if you are willing to settle for 'less than analog boradcast > quality signals'. Recall that anyone who compared the quality of the > RF signal output of a VCR to the composite signal quickly decided that > it was worth buying the composite cables. And a component connection > offers even better performance. > > Also, unlike others, I do a little research. Well try reading what is posted instead. It was stated that the best quality video would be with HDMI, with component, S-Video, composite and RF trailing in descending order. Correct statement. Not sure how your "boradcast" signals would differ (if at all.)
First
|
Prev
|
Next
|
Last
Pages: 1 2 3 4 5 Prev: What caps is this? Next: AC current sensor with interface |