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Splitting a Video composite signal
I am wondering if there is a way to share my VHS player with two seperate televisions without buying expensive equipment. The connection on the back of the VHS player is a video (RCA) composite. Please advice..... One of the less expensive, but very good solutions:
http://www.smarthome.com/8141.html Radio Shack also sells a cheaper unit which works adequately for non-critical users. <Kingofsurf***@gmail.com> wrote in message Show quoteHide quote news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... > Hi gang, > > I am wondering if there is a way to share my VHS player with two > seperate televisions without buying expensive equipment. The > connection on the back of the VHS player is a video (RCA) composite. > Please advice..... > If you do not have very long runs of cable, just use a RCA to RCA Y cable
set. Amplifiers are usually for long runs, floor to floor, etc. Radio Shack sells them too. If you find the video is bad, an amplifier would help. <Kingofsurf***@gmail.com> wrote in message Show quoteHide quote news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... > Hi gang, > > I am wondering if there is a way to share my VHS player with two > seperate televisions without buying expensive equipment. The > connection on the back of the VHS player is a video (RCA) composite. > Please advice..... > No. Usually, the video (because it's at 75 ohm impedance) gets really
bad if you connect two inputs in unamplified parallel to one output. Amplification is almost certainly needed. Of course, if your source has two separate outputs, and if you connect them separately to the two sets, that works fine. On 2/01/2007, MK posted this: Show quoteHide quote > If you do not have very long runs of cable, just use a RCA to RCA Y cable > set. Amplifiers are usually for long runs, floor to floor, etc. Radio Shack > sells them too. If you find the video is bad, an amplifier would help. > > > <Kingofsurf***@gmail.com> wrote in message > news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... >> Hi gang, >> >> I am wondering if there is a way to share my VHS player with two >> seperate televisions without buying expensive equipment. The >> connection on the back of the VHS player is a video (RCA) composite. >> Please advice..... >> -- Gene E. Bloch (Gino) letters617blochg3251 (replace the numbers by "at" and "dotcom") I agree entirely with Gene, and recommended a distributution amplifier to
prevent this problem. The better ones like the one I cited in my prior reply typically have low impedance, buffered outputs which are designed to drive reactive loads with no significant degradation to the other outputs. A Y connector offers no such protection. The cheaper Radio Shack distribution amps typically drive all 4 outputs with a common output stage for each of the composite, left, and right outputs, using only series resistors to isolate the 4 individual loads. This cheaper solution can and often does degrade performance, especially if one or more of the loads is a mismatched impedance. Smarty Show quoteHide quote "Gene E. Bloch" <spamfree@nobody.invalid> wrote in message news:mn.0c557d729d572b17.1980@nobody.invalid... > No. Usually, the video (because it's at 75 ohm impedance) gets really bad > if you connect two inputs in unamplified parallel to one output. > > Amplification is almost certainly needed. > > Of course, if your source has two separate outputs, and if you connect > them separately to the two sets, that works fine. > > On 2/01/2007, MK posted this: >> If you do not have very long runs of cable, just use a RCA to RCA Y cable >> set. Amplifiers are usually for long runs, floor to floor, etc. Radio >> Shack sells them too. If you find the video is bad, an amplifier would >> help. >> >> >> <Kingofsurf***@gmail.com> wrote in message >> news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... >>> Hi gang, >>> >>> I am wondering if there is a way to share my VHS player with two >>> seperate televisions without buying expensive equipment. The >>> connection on the back of the VHS player is a video (RCA) composite. >>> Please advice..... >>> > > -- > Gene E. Bloch (Gino) > letters617blochg3251 > (replace the numbers by "at" and "dotcom") > > Thanks for the heads-up on the Radio Shack approach...
On 2/01/2007, Smarty posted this: Show quoteHide quote > I agree entirely with Gene, and recommended a distributution amplifier to > prevent this problem. The better ones like the one I cited in my prior reply > typically have low impedance, buffered outputs which are designed to drive > reactive loads with no significant degradation to the other outputs. A Y > connector offers no such protection. The cheaper Radio Shack distribution > amps typically drive all 4 outputs with a common output stage for each of the > composite, left, and right outputs, using only series resistors to isolate > the 4 individual loads. This cheaper solution can and often does degrade > performance, especially if one or more of the loads is a mismatched > impedance. > > Smarty > > > "Gene E. Bloch" <spamfree@nobody.invalid> wrote in message > news:mn.0c557d729d572b17.1980@nobody.invalid... >> No. Usually, the video (because it's at 75 ohm impedance) gets really bad >> if you connect two inputs in unamplified parallel to one output. >> >> Amplification is almost certainly needed. >> >> Of course, if your source has two separate outputs, and if you connect them >> separately to the two sets, that works fine. >> >> On 2/01/2007, MK posted this: >>> If you do not have very long runs of cable, just use a RCA to RCA Y cable >>> set. Amplifiers are usually for long runs, floor to floor, etc. Radio >>> Shack sells them too. If you find the video is bad, an amplifier would >>> help. >>> >>> >>> <Kingofsurf***@gmail.com> wrote in message >>> news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... >>>> Hi gang, >>>> >>>> I am wondering if there is a way to share my VHS player with two >>>> seperate televisions without buying expensive equipment. The >>>> connection on the back of the VHS player is a video (RCA) composite. >>>> Please advice..... >>>> >> >> -- Gene E. Bloch (Gino) >> letters617blochg3251 >> (replace the numbers by "at" and "dotcom") >> >> -- Gene E. Bloch (Gino) letters617blochg3251 (replace the numbers by "at" and "dotcom")
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Ï "Smarty" <nob***@nobody.com> Ýãñáøå óôï ìÞíõìá Yeah, seconded.Now, there's another solution...that existed for sure innews:sNydnY6LXf97L1_YnZ2dnUVZ_sKunZ2d@adelphia.com... > I agree entirely with Gene, and recommended a distributution amplifier to > prevent this problem. The better ones like the one I cited in my prior reply > typically have low impedance, buffered outputs which are designed to drive > reactive loads with no significant degradation to the other outputs. A Y > connector offers no such protection. The cheaper Radio Shack distribution > amps typically drive all 4 outputs with a common output stage for each of > the composite, left, and right outputs, using only series resistors to > isolate the 4 individual loads. This cheaper solution can and often does > degrade performance, especially if one or more of the loads is a mismatched > impedance. > > Smarty > > > "Gene E. Bloch" <spamfree@nobody.invalid> wrote in message > news:mn.0c557d729d572b17.1980@nobody.invalid... > > No. Usually, the video (because it's at 75 ohm impedance) gets really bad > > if you connect two inputs in unamplified parallel to one output. > > > > Amplification is almost certainly needed. > > > > Of course, if your source has two separate outputs, and if you connect > > them separately to the two sets, that works fine. > > > > On 2/01/2007, MK posted this: > >> If you do not have very long runs of cable, just use a RCA to RCA Y cable > >> set. Amplifiers are usually for long runs, floor to floor, etc. Radio > >> Shack sells them too. If you find the video is bad, an amplifier would > >> help. > >> > >> > >> <Kingofsurf***@gmail.com> wrote in message > >> news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... > >>> Hi gang, > >>> > >>> I am wondering if there is a way to share my VHS player with two > >>> seperate televisions without buying expensive equipment. The > >>> connection on the back of the VHS player is a video (RCA) composite. > >>> Please advice..... > >>> > > Greece in the '90s, I don't know if you had it in USA at all.A mini RF modulator-transmitter, with enough power to drive most (or all) TV sets inside your house.(Maybe a precursor of the bluetooth technology?)So, that would be wireless, without any problems with impendance etc.(If there are any units left in some tiny shop?) -- Tzortzakakis Dimitrios major in electrical engineering mechanized infantry reservist dimtzort AT otenet DOT gr An RF modulator is indeed another option, and Radio Shack and others sell
cheap units here in the U.S. 3 new problems arise, however. 1. The modulators typically do not preserve stereo audio, and only modulate a monaural signal on the RF carrier. This spoils the audio presentation spatially. 2. The process of modulating and demodulating the video and audio reduces bandwidth / resolution, signal to noise ratio, grey scale, and color purity considerably. 3. U.S. emission / radiation limits imposed by the FCC severely restrict the modulator's RF power output making wireless broadcasting around the house essentially impossible. Further, the RF output frequency (nominally channel 3 or 4) is typically used for true commercial broadcasting so that a TV receiver / tuner will see competing carriers, adjacent channel interference, etc. The FCC's "answer" to these limitations is to permit unlicensed "type-approved" 2.4 GHz video/audio transmitters and receivers to be used for short-haul wireless links. This is an alternative approach which could be tried, although my personal experience with several brands of Terk, Leapfrog, X-10 and other such units is that they are comparably expensive to a distribution amp but are much noisier, extremely susceptible to multipath and interference from microwave ovens, 802.11.b. wireless links, cordless phones, etc. Thus I would stick with the original distribution amplifier solution, which provides excellent quality, total immunity to atmospheric and man-made noise / interference, and is modestly priced. Smarty Show quoteHide quote "Tzortzakakis Dimitrios" <nowh***@noone.com> wrote in message news:epvl7v$k0d$1@mouse.otenet.gr... > > Ï "Smarty" <nob***@nobody.com> Ýãñáøå óôï ìÞíõìá > news:sNydnY6LXf97L1_YnZ2dnUVZ_sKunZ2d@adelphia.com... >> I agree entirely with Gene, and recommended a distributution amplifier to >> prevent this problem. The better ones like the one I cited in my prior > reply >> typically have low impedance, buffered outputs which are designed to >> drive >> reactive loads with no significant degradation to the other outputs. A Y >> connector offers no such protection. The cheaper Radio Shack distribution >> amps typically drive all 4 outputs with a common output stage for each of >> the composite, left, and right outputs, using only series resistors to >> isolate the 4 individual loads. This cheaper solution can and often does >> degrade performance, especially if one or more of the loads is a > mismatched >> impedance. >> >> Smarty >> >> >> "Gene E. Bloch" <spamfree@nobody.invalid> wrote in message >> news:mn.0c557d729d572b17.1980@nobody.invalid... >> > No. Usually, the video (because it's at 75 ohm impedance) gets really > bad >> > if you connect two inputs in unamplified parallel to one output. >> > >> > Amplification is almost certainly needed. >> > >> > Of course, if your source has two separate outputs, and if you connect >> > them separately to the two sets, that works fine. >> > >> > On 2/01/2007, MK posted this: >> >> If you do not have very long runs of cable, just use a RCA to RCA Y > cable >> >> set. Amplifiers are usually for long runs, floor to floor, etc. Radio >> >> Shack sells them too. If you find the video is bad, an amplifier would >> >> help. >> >> >> >> >> >> <Kingofsurf***@gmail.com> wrote in message >> >> news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... >> >>> Hi gang, >> >>> >> >>> I am wondering if there is a way to share my VHS player with two >> >>> seperate televisions without buying expensive equipment. The >> >>> connection on the back of the VHS player is a video (RCA) composite. >> >>> Please advice..... >> >>> >> > > Yeah, seconded.Now, there's another solution...that existed for sure in > Greece in the '90s, I don't know if you had it in USA at all.A mini RF > modulator-transmitter, with enough power to drive most (or all) TV sets > inside your house.(Maybe a precursor of the bluetooth technology?)So, that > would be wireless, without any problems with impendance etc.(If there are > any units left in some tiny shop?) > > > -- > Tzortzakakis Dimitrios > major in electrical engineering > mechanized infantry reservist > dimtzort AT otenet DOT gr > >
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Ï "Smarty" <nob***@nobody.com> Ýãñáøå óôï ìÞíõìá Correct.RF modulation is a technology of the 80s.news:cNWdnY_5fL-EXF7YnZ2dnUVZ_ragnZ2d@adelphia.com... > An RF modulator is indeed another option, and Radio Shack and others sell > cheap units here in the U.S. > > 3 new problems arise, however. > > 1. The modulators typically do not preserve stereo audio, and only modulate > a monaural signal on the RF carrier. This spoils the audio presentation > spatially. > Absolutely right. > 2. The process of modulating and demodulating the video and audio reduces > bandwidth / resolution, signal to noise ratio, grey scale, and color purity > considerably. > > 3. U.S. emission / radiation limits imposed by the FCC severely restrict If there's a srong signal inside the house.the > modulator's RF power output making wireless broadcasting around the house > essentially impossible. Further, the RF output frequency (nominally channel > 3 or 4) is typically used for true commercial broadcasting so that a TV > receiver / tuner will see competing carriers, adjacent channel interference, > etc. > > The FCC's "answer" to these limitations is to permit unlicensed Yeah, right it seems a bit of an overkill also to use a transmitter *and* a> "type-approved" 2.4 GHz video/audio transmitters and receivers to be used > for short-haul wireless links. This is an alternative approach which could > be tried, although my personal experience with several brands of Terk, > Leapfrog, X-10 and other such units is that they are comparably expensive to > a distribution amp but are much noisier, extremely susceptible to multipath > and interference from microwave ovens, 802.11.b. wireless links, cordless > phones, etc. > receiver. > Thus I would stick with the original distribution amplifier solution, Of course, that would be perfect if the TV sets are close to each other.which > provides excellent quality, total immunity to atmospheric and man-made noise > / interference, and is modestly priced. > What I would like to add, is some incident with a customer of mine, who's a chemist.He wanted an anntena installed on the roof of his house, and he wanted to run two cables from that anntena.I told him, of course, that he would need a splitter and should have told me before so that I would buy it.He insisted that all I should do was connect both cables on the anntena's terminal screws!!A chemist coercing me to do my job as he wants?Imagine going to the chemist's "I would like some Valium""Have you go a precription, sir?""NO BUT DO GIVE IT TO ME!!!"Insane, eh? Show quoteHide quote > Smarty > > > > > > "Tzortzakakis Dimitrios" <nowh***@noone.com> wrote in message > news:epvl7v$k0d$1@mouse.otenet.gr... > > > > Ï "Smarty" <nob***@nobody.com> Ýãñáøå óôï ìÞíõìá > > news:sNydnY6LXf97L1_YnZ2dnUVZ_sKunZ2d@adelphia.com... > >> I agree entirely with Gene, and recommended a distributution amplifier to > >> prevent this problem. The better ones like the one I cited in my prior > > reply > >> typically have low impedance, buffered outputs which are designed to > >> drive > >> reactive loads with no significant degradation to the other outputs. A Y > >> connector offers no such protection. The cheaper Radio Shack distribution > >> amps typically drive all 4 outputs with a common output stage for each of > >> the composite, left, and right outputs, using only series resistors to > >> isolate the 4 individual loads. This cheaper solution can and often does > >> degrade performance, especially if one or more of the loads is a > > mismatched > >> impedance. > >> > >> Smarty > >> > >> > >> "Gene E. Bloch" <spamfree@nobody.invalid> wrote in message > >> news:mn.0c557d729d572b17.1980@nobody.invalid... > >> > No. Usually, the video (because it's at 75 ohm impedance) gets really > > bad > >> > if you connect two inputs in unamplified parallel to one output. > >> > > >> > Amplification is almost certainly needed. > >> > > >> > Of course, if your source has two separate outputs, and if you connect > >> > them separately to the two sets, that works fine. > >> > > >> > On 2/01/2007, MK posted this: > >> >> If you do not have very long runs of cable, just use a RCA to RCA Y > > cable > >> >> set. Amplifiers are usually for long runs, floor to floor, etc. Radio > >> >> Shack sells them too. If you find the video is bad, an amplifier would > >> >> help. > >> >> > >> >> > >> >> <Kingofsurf***@gmail.com> wrote in message > >> >> news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... > >> >>> Hi gang, > >> >>> > >> >>> I am wondering if there is a way to share my VHS player with two > >> >>> seperate televisions without buying expensive equipment. The > >> >>> connection on the back of the VHS player is a video (RCA) composite. > >> >>> Please advice..... > >> >>> > >> > > > Yeah, seconded.Now, there's another solution...that existed for sure in > > Greece in the '90s, I don't know if you had it in USA at all.A mini RF > > modulator-transmitter, with enough power to drive most (or all) TV sets > > inside your house.(Maybe a precursor of the bluetooth technology?)So, that > > would be wireless, without any problems with impendance etc.(If there are > > any units left in some tiny shop?) > > > > > > -- > > Tzortzakakis Dimitrios > > major in electrical engineering > > mechanized infantry reservist > > dimtzort AT otenet DOT gr > > > > > > I agree, and if long distances are involved from the splitter to one or both
of the TV / monitors, the extra wire will add to the cost. However, the amplifier I cited is very capable of driving reasonably long lines with no degradation, since the video and audio are baseband signals, and most shielded / braided cable can handle 3 or 4 MHz baseband video from a VHS player with no high frequency tilt. Smarty Show quoteHide quote "Tzortzakakis Dimitrios" <nowh***@noone.com> wrote in message news:eq57lb$s44$1@mouse.otenet.gr... > > Ï "Smarty" <nob***@nobody.com> Ýãñáøå óôï ìÞíõìá > news:cNWdnY_5fL-EXF7YnZ2dnUVZ_ragnZ2d@adelphia.com... >> An RF modulator is indeed another option, and Radio Shack and others sell >> cheap units here in the U.S. >> >> 3 new problems arise, however. >> >> 1. The modulators typically do not preserve stereo audio, and only > modulate >> a monaural signal on the RF carrier. This spoils the audio presentation >> spatially. >> > Absolutely right. >> 2. The process of modulating and demodulating the video and audio reduces >> bandwidth / resolution, signal to noise ratio, grey scale, and color > purity >> considerably. >> > Correct.RF modulation is a technology of the 80s. >> 3. U.S. emission / radiation limits imposed by the FCC severely restrict > the >> modulator's RF power output making wireless broadcasting around the house >> essentially impossible. Further, the RF output frequency (nominally > channel >> 3 or 4) is typically used for true commercial broadcasting so that a TV >> receiver / tuner will see competing carriers, adjacent channel > interference, >> etc. >> > If there's a srong signal inside the house. >> The FCC's "answer" to these limitations is to permit unlicensed >> "type-approved" 2.4 GHz video/audio transmitters and receivers to be used >> for short-haul wireless links. This is an alternative approach which >> could >> be tried, although my personal experience with several brands of Terk, >> Leapfrog, X-10 and other such units is that they are comparably expensive > to >> a distribution amp but are much noisier, extremely susceptible to > multipath >> and interference from microwave ovens, 802.11.b. wireless links, cordless >> phones, etc. >> > Yeah, right it seems a bit of an overkill also to use a transmitter *and* > a > receiver. >> Thus I would stick with the original distribution amplifier solution, > which >> provides excellent quality, total immunity to atmospheric and man-made > noise >> / interference, and is modestly priced. >> > Of course, that would be perfect if the TV sets are close to each other. > What I would like to add, is some incident with a customer of mine, who's > a > chemist.He wanted an anntena installed on the roof of his house, and he > wanted to run two cables from that anntena.I told him, of course, that he > would need a splitter and should have told me before so that I would buy > it.He insisted that all I should do was connect both cables on the > anntena's > terminal screws!!A chemist coercing me to do my job as he wants?Imagine > going to the chemist's "I would like some Valium""Have you go a > precription, > sir?""NO BUT DO GIVE IT TO ME!!!"Insane, eh? >> Smarty >> >> >> >> >> >> "Tzortzakakis Dimitrios" <nowh***@noone.com> wrote in message >> news:epvl7v$k0d$1@mouse.otenet.gr... >> > >> > Ï "Smarty" <nob***@nobody.com> Ýãñáøå óôï ìÞíõìá >> > news:sNydnY6LXf97L1_YnZ2dnUVZ_sKunZ2d@adelphia.com... >> >> I agree entirely with Gene, and recommended a distributution amplifier > to >> >> prevent this problem. The better ones like the one I cited in my prior >> > reply >> >> typically have low impedance, buffered outputs which are designed to >> >> drive >> >> reactive loads with no significant degradation to the other outputs. A > Y >> >> connector offers no such protection. The cheaper Radio Shack > distribution >> >> amps typically drive all 4 outputs with a common output stage for each > of >> >> the composite, left, and right outputs, using only series resistors to >> >> isolate the 4 individual loads. This cheaper solution can and often > does >> >> degrade performance, especially if one or more of the loads is a >> > mismatched >> >> impedance. >> >> >> >> Smarty >> >> >> >> >> >> "Gene E. Bloch" <spamfree@nobody.invalid> wrote in message >> >> news:mn.0c557d729d572b17.1980@nobody.invalid... >> >> > No. Usually, the video (because it's at 75 ohm impedance) gets >> >> > really >> > bad >> >> > if you connect two inputs in unamplified parallel to one output. >> >> > >> >> > Amplification is almost certainly needed. >> >> > >> >> > Of course, if your source has two separate outputs, and if you > connect >> >> > them separately to the two sets, that works fine. >> >> > >> >> > On 2/01/2007, MK posted this: >> >> >> If you do not have very long runs of cable, just use a RCA to RCA Y >> > cable >> >> >> set. Amplifiers are usually for long runs, floor to floor, etc. > Radio >> >> >> Shack sells them too. If you find the video is bad, an amplifier > would >> >> >> help. >> >> >> >> >> >> >> >> >> <Kingofsurf***@gmail.com> wrote in message >> >> >> news:1170283574.046828.182240@j27g2000cwj.googlegroups.com... >> >> >>> Hi gang, >> >> >>> >> >> >>> I am wondering if there is a way to share my VHS player with two >> >> >>> seperate televisions without buying expensive equipment. The >> >> >>> connection on the back of the VHS player is a video (RCA) > composite. >> >> >>> Please advice..... >> >> >>> >> >> > >> > Yeah, seconded.Now, there's another solution...that existed for sure in >> > Greece in the '90s, I don't know if you had it in USA at all.A mini RF >> > modulator-transmitter, with enough power to drive most (or all) TV sets >> > inside your house.(Maybe a precursor of the bluetooth technology?)So, > that >> > would be wireless, without any problems with impendance etc.(If there > are >> > any units left in some tiny shop?) >> > >> > >> > -- >> > Tzortzakakis Dimitrios >> > major in electrical engineering >> > mechanized infantry reservist >> > dimtzort AT otenet DOT gr >> > >> > >> >> > > 
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