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Building a PVR: Connection to coaxial Jack
Hi,
I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Unfortunately, my TV only has a 75 Ohm coaxial connector (the one for the analog cable for the cable-tv or VCR etc), no composites or S-Video. I was wondering if it is possible to connect the tv-out port of the card to the 75-Ohm connector of the TV using some sort of adapter, and whether such things are available. I googled but only saw adapters for composite-to-RCA or composite-to-S-Video and various permutations of composite, RCA and S-Video, but nothing for 75-Ohm coaxials. Can anyone inform/educate me as to whether this is doable? Thanks, AR |
#2
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Analabha Roy wrote:
Hi, I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Unfortunately, my TV only has a 75 Ohm coaxial connector (the one for the analog cable for the cable-tv or VCR etc), no composites or S-Video. I was wondering if it is possible to connect the tv-out port of the card to the 75-Ohm connector of the TV using some sort of adapter, and whether such things are available. I googled but only saw adapters for composite-to-RCA or composite-to-S-Video and various permutations of composite, RCA and S-Video, but nothing for 75-Ohm coaxials. Can anyone inform/educate me as to whether this is doable? Thanks, AR Put simply, the standard coaxial cable input to a television is meant for one thing: accepting an RF (radio frequency) signal such as is transmitted over the air from a television transmitter (or coming from a cable television setup, VCR, or equivalent). So what you really need is to convert the video and possibly the audio too into something that passes for a broadcast-type signal. The device for the job is an RF modulator. Sadly the process of converting good video from an S-video jack into RF then putting it into a television then turning it back into a video signal and then displaying it is costly in terms of quality. But if you still want to do it, a quick read of this article might help you out: http://hometheater.about.com/cs/dvdl...advdrfmoda.htm -- John McGaw [Knoxville, TN, USA] http://johnmcgaw.com |
#3
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Analabha Roy wrote:
Hi, I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Unfortunately, my TV only has a 75 Ohm coaxial connector (the one for the analog cable for the cable-tv or VCR etc), no composites or S-Video. I was wondering if it is possible to connect the tv-out port of the card to the 75-Ohm connector of the TV using some sort of adapter, and whether such things are available. I googled but only saw adapters for composite-to-RCA or composite-to-S-Video and various permutations of composite, RCA and S-Video, but nothing for 75-Ohm coaxials. Can anyone inform/educate me as to whether this is doable? Thanks, AR Yep. You need a gadget called a RF Modulator. Like this: http://tinyurl.com/5f6m6 |
#4
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On Wed, 28 Sep 2005 20:16:55 -0500, Analabha Roy
wrote: Hi, I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Unfortunately, my TV only has a 75 Ohm coaxial connector (the one for the analog cable for the cable-tv or VCR etc), no composites or S-Video. I was wondering if it is possible to connect the tv-out port of the card to the 75-Ohm connector of the TV using some sort of adapter, and whether such things are available. I googled but only saw adapters for composite-to-RCA or composite-to-S-Video and various permutations of composite, RCA and S-Video, but nothing for 75-Ohm coaxials. Can anyone inform/educate me as to whether this is doable? You'd need what's commonly called an RF modulator box. It typically takes a composite input and outputs the single to the coaxial as channel 3 or 4 (you tune the TV to that channel). They're significantly more expensive than a mere cable or plug adapter, roughly $60. Well I'm wrong- thanks to modern technology, these basic boxes can be had for under $20 now, for example, http://froogle.google.com/froogle?q=...ator&scoring=p http://www.costcentral.com/proddetai...40564/froogle/ Some of them may be better than others- I don't know which are good or bad relative to the rest. |
#5
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"Analabha Roy" wrote in message ... Hi, I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Nope... These *INPUTS* are of the coax cable, svideo and composite video. You put your signal INTO the PVR card here. It's your VIDEO card that has the output, and it will be at worst composite video, second is Svideo and finally VGA or DVI which is MUCH better. If your TV doesn't even have composite in, spend $100 on a new TV before you spend it on a tuner card. |
#6
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Analabha Roy wrote:
Hi, I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Unfortunately, my TV only has a 75 Ohm coaxial connector (the one for the analog cable for the cable-tv or VCR etc), no composites or S-Video. I was wondering if it is possible to connect the tv-out port of the card to the 75-Ohm connector of the TV using some sort of adapter, and whether such things are available. I googled but only saw adapters for composite-to-RCA or composite-to-S-Video and various permutations of composite, RCA and S-Video, but nothing for 75-Ohm coaxials. Thx all. Looks like I'm in business. Can anyone inform/educate me as to whether this is doable? Thanks, AR |
#7
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Analabha Roy wrote:
Analabha Roy wrote: Hi, I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Unfortunately, my TV only has a 75 Ohm coaxial connector (the one for the analog cable for the cable-tv or VCR etc), no composites or S-Video. I was wondering if it is possible to connect the tv-out port of the card to the 75-Ohm connector of the TV using some sort of adapter, and whether such things are available. I googled but only saw adapters for composite-to-RCA or composite-to-S-Video and various permutations of composite, RCA and S-Video, but nothing for 75-Ohm coaxials. Thx all. Looks like I'm in business. Before you spend money on a RF modulator, which is the correct solution: All video VCR s contain a modulator which will give you an output on TV RF channel 3 or 4. The mechanical parts usually fail first, so units are often available for free. Simply connect the video and audio outputs from the computer to the corresponding inputs of the VCR, set your TV to channel 3 or 4, and you're in business. -- Virg Wall |
#8
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Most VCRs have RF input and OUTPUT and also Composite input and output. If you own a vcr, you should know what to do. I own a RF input only tv too. So I use 2 broken VCRs for all kinds of connections. On Wed, 28 Sep 2005 20:16:55 -0500, Analabha Roy wrote: =Hi, = = I'm trying to build a PVR machine that I can watch/record TV with. I was =thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. =However, the tv-out ports in those and similar cards seems to be either of =the composite type or S-Video type. Unfortunately, my TV only has a 75 Ohm =coaxial connector (the one for the analog cable for the cable-tv or VCR =etc), no composites or S-Video. I was wondering if it is possible to =connect the tv-out port of the card to the 75-Ohm connector of the TV using =some sort of adapter, and whether such things are available. I googled but =only saw adapters for composite-to-RCA or composite-to-S-Video and various =permutations of composite, RCA and S-Video, but nothing for 75-Ohm =coaxials. = = Can anyone inform/educate me as to whether this is doable? = = =Thanks, =AR |
#9
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Noozer wrote:
"Analabha Roy" wrote in message ... Hi, I'm trying to build a PVR machine that I can watch/record TV with. I was thinking of using the Hauppauge PVR 150/250/350 card for a tv tuner. However, the tv-out ports in those and similar cards seems to be either of the composite type or S-Video type. Nope... These *INPUTS* are of the coax cable, svideo and composite video. You put your signal INTO the PVR card here. For most cards, yes. But from what I read in the knoppmyth forums and from the manual at hauppauge's site, the PVR 350 has a port called A/V OUT (in addition to S-Video in). That's supposed to be for the TV-out from the PVR. The firmware supports MPEG decoding, which it would have to do in order to feed raw video data OUT of the card. Please correct me if I'm wrong. It's your VIDEO card that has the output, and it will be at worst composite video, second is Svideo and finally VGA or DVI which is MUCH better. If your TV doesn't even have composite in, spend $100 on a new TV before you spend it on a tuner card. |
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