Circuitry of TV splittersHow boost a DVB-C signalReradiating antena for GPSWhat level of a square wave signal...

Is every set a filtered colimit of finite sets?

What does "enim et" mean?

Is Social Media Science Fiction?

Where else does the Shulchan Aruch quote an authority by name?

What do you call words made from common English words?

Copycat chess is back

A poker game description that does not feel gimmicky

Prime joint compound before latex paint?

What's the difference between repeating elections every few years and repeating a referendum after a few years?

Lied on resume at previous job

Hosting Wordpress in a EC2 Load Balanced Instance

"My colleague's body is amazing"

If a centaur druid Wild Shapes into a Giant Elk, do their Charge features stack?

What is the meaning of "of trouble" in the following sentence?

Doomsday-clock for my fantasy planet

How many letters suffice to construct words with no repetition?

Are cabin dividers used to "hide" the flex of the airplane?

How to manage monthly salary

Does a dangling wire really electrocute me if I'm standing in water?

Landlord wants to switch my lease to a "Land contract" to "get back at the city"

Can the Produce Flame cantrip be used to grapple, or as an unarmed strike, in the right circumstances?

Manga about a female worker who got dragged into another world together with this high school girl and she was just told she's not needed anymore

Can I legally use front facing blue light in the UK?

LWC and complex parameters



Circuitry of TV splitters


How boost a DVB-C signalReradiating antena for GPSWhat level of a square wave signal should be safe for TV receivers?Amplifying AC voltage via DC supply voltageSIM808 can't get GPS fix on custom boardWhy do I have 120v coming out of a 240v cableDoes the feed line contribute to the function of a PCB patch antenna?UHF TV transmitting circuitryShielded cable, to ground or not, in amplifierAmplifier advice for speech sythesizer circuit






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}







8












$begingroup$


I'm trying to understand the circuitry of TV signal splitters and associated boosters/amplifiers, and I have two questions.
My situation is as follows. I have a TV aerial (antenna) in my loft. It connects to a non-powered box, which I assume must be a passive splitter. From there cables run to sockets in a total of 6 rooms. However, only in two or three of those rooms does a TV connected to the socket show any signal; and even in those rooms, there is no signal unless a booster, located in the room nearest to the aerial, is connected and powered up.
That all sounds sensible, but then I stop being able to understand.




  1. Here's the odd thing, and the first question. To make any TV on the system work, the booster has to be connected to the aerial socket, but nothing needs to be connected to the booster output; so long as the booster is connected and switched on, the TV in a neighbouring room will work. It's as though it is somehow sending the amplified signal back up its input cable. But I've looked at circuit diagrams for boosters, and that doesn't look possible. Can anyone explain what is going on?


  2. I am trying to find out what is wrong in the rooms where no signal is ever reported. I read somewhere that if I look across the terminals of the TV socket with an ohmmeter, I should see effectively zero resistance, since there is continuity through the aerial. However, this is not true for any of my sockets. With all devices disconnected, if I look at the resistance at the socket the booster normally connects to, I see about 4k. If I look across any of the other sockets (including those where a signal is successfully received), I see no continuity at all. So I suppose that the passive splitter must have a capacitor or transformer somewhere in its circuitry, but I can't find a circuit diagram anywhere that would show whether this is true. Can anyone say whether this is the case, i.e. whether I should be able to see continuity when looking into a socket?



Background information:




  • Until recently we have never tried to use TVs in the rooms where we now find they don't work, so this is probably not a new problem.

  • In particular, the non-functioning sockets have not been used since the analogue era.

  • The wiring is probably at least 30 years old, and certainly pre-digital.

  • I'm in the UK, and the TV signal is digital terrestrial.

  • Fitting an outdoor aerial to get a better original signal is not an option in our neighbourhood.

  • The passive splitter and aerial connections are all screw-downs, and they are not conveniently located, so swapping cables around for test purposes is slow and painful.










share|improve this question









New contributor




seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$












  • $begingroup$
    I don't think you can get sensible readings when poking an ohmmeter into antenna sockets that are being driven with RF energy signal. One thing might be that the signal is too strong so it kind of blindfolds the TV analog RF frontend so it can't see the signal. Then when you have some loads connected like the booster, it is a load that reduces power to other device that can then see the signal better. So maybe you just need more attenuation between TV and antenna socket.
    $endgroup$
    – Justme
    yesterday












  • $begingroup$
    If cables are unterminated they can represent harmonic 1/4 wave short circuits at those wavelengths to some rooms on some channels. But poor cable shields nicked can also degrade signals.
    $endgroup$
    – Sunnyskyguy EE75
    yesterday




















8












$begingroup$


I'm trying to understand the circuitry of TV signal splitters and associated boosters/amplifiers, and I have two questions.
My situation is as follows. I have a TV aerial (antenna) in my loft. It connects to a non-powered box, which I assume must be a passive splitter. From there cables run to sockets in a total of 6 rooms. However, only in two or three of those rooms does a TV connected to the socket show any signal; and even in those rooms, there is no signal unless a booster, located in the room nearest to the aerial, is connected and powered up.
That all sounds sensible, but then I stop being able to understand.




  1. Here's the odd thing, and the first question. To make any TV on the system work, the booster has to be connected to the aerial socket, but nothing needs to be connected to the booster output; so long as the booster is connected and switched on, the TV in a neighbouring room will work. It's as though it is somehow sending the amplified signal back up its input cable. But I've looked at circuit diagrams for boosters, and that doesn't look possible. Can anyone explain what is going on?


  2. I am trying to find out what is wrong in the rooms where no signal is ever reported. I read somewhere that if I look across the terminals of the TV socket with an ohmmeter, I should see effectively zero resistance, since there is continuity through the aerial. However, this is not true for any of my sockets. With all devices disconnected, if I look at the resistance at the socket the booster normally connects to, I see about 4k. If I look across any of the other sockets (including those where a signal is successfully received), I see no continuity at all. So I suppose that the passive splitter must have a capacitor or transformer somewhere in its circuitry, but I can't find a circuit diagram anywhere that would show whether this is true. Can anyone say whether this is the case, i.e. whether I should be able to see continuity when looking into a socket?



Background information:




  • Until recently we have never tried to use TVs in the rooms where we now find they don't work, so this is probably not a new problem.

  • In particular, the non-functioning sockets have not been used since the analogue era.

  • The wiring is probably at least 30 years old, and certainly pre-digital.

  • I'm in the UK, and the TV signal is digital terrestrial.

  • Fitting an outdoor aerial to get a better original signal is not an option in our neighbourhood.

  • The passive splitter and aerial connections are all screw-downs, and they are not conveniently located, so swapping cables around for test purposes is slow and painful.










share|improve this question









New contributor




seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$












  • $begingroup$
    I don't think you can get sensible readings when poking an ohmmeter into antenna sockets that are being driven with RF energy signal. One thing might be that the signal is too strong so it kind of blindfolds the TV analog RF frontend so it can't see the signal. Then when you have some loads connected like the booster, it is a load that reduces power to other device that can then see the signal better. So maybe you just need more attenuation between TV and antenna socket.
    $endgroup$
    – Justme
    yesterday












  • $begingroup$
    If cables are unterminated they can represent harmonic 1/4 wave short circuits at those wavelengths to some rooms on some channels. But poor cable shields nicked can also degrade signals.
    $endgroup$
    – Sunnyskyguy EE75
    yesterday
















8












8








8


2



$begingroup$


I'm trying to understand the circuitry of TV signal splitters and associated boosters/amplifiers, and I have two questions.
My situation is as follows. I have a TV aerial (antenna) in my loft. It connects to a non-powered box, which I assume must be a passive splitter. From there cables run to sockets in a total of 6 rooms. However, only in two or three of those rooms does a TV connected to the socket show any signal; and even in those rooms, there is no signal unless a booster, located in the room nearest to the aerial, is connected and powered up.
That all sounds sensible, but then I stop being able to understand.




  1. Here's the odd thing, and the first question. To make any TV on the system work, the booster has to be connected to the aerial socket, but nothing needs to be connected to the booster output; so long as the booster is connected and switched on, the TV in a neighbouring room will work. It's as though it is somehow sending the amplified signal back up its input cable. But I've looked at circuit diagrams for boosters, and that doesn't look possible. Can anyone explain what is going on?


  2. I am trying to find out what is wrong in the rooms where no signal is ever reported. I read somewhere that if I look across the terminals of the TV socket with an ohmmeter, I should see effectively zero resistance, since there is continuity through the aerial. However, this is not true for any of my sockets. With all devices disconnected, if I look at the resistance at the socket the booster normally connects to, I see about 4k. If I look across any of the other sockets (including those where a signal is successfully received), I see no continuity at all. So I suppose that the passive splitter must have a capacitor or transformer somewhere in its circuitry, but I can't find a circuit diagram anywhere that would show whether this is true. Can anyone say whether this is the case, i.e. whether I should be able to see continuity when looking into a socket?



Background information:




  • Until recently we have never tried to use TVs in the rooms where we now find they don't work, so this is probably not a new problem.

  • In particular, the non-functioning sockets have not been used since the analogue era.

  • The wiring is probably at least 30 years old, and certainly pre-digital.

  • I'm in the UK, and the TV signal is digital terrestrial.

  • Fitting an outdoor aerial to get a better original signal is not an option in our neighbourhood.

  • The passive splitter and aerial connections are all screw-downs, and they are not conveniently located, so swapping cables around for test purposes is slow and painful.










share|improve this question









New contributor




seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




I'm trying to understand the circuitry of TV signal splitters and associated boosters/amplifiers, and I have two questions.
My situation is as follows. I have a TV aerial (antenna) in my loft. It connects to a non-powered box, which I assume must be a passive splitter. From there cables run to sockets in a total of 6 rooms. However, only in two or three of those rooms does a TV connected to the socket show any signal; and even in those rooms, there is no signal unless a booster, located in the room nearest to the aerial, is connected and powered up.
That all sounds sensible, but then I stop being able to understand.




  1. Here's the odd thing, and the first question. To make any TV on the system work, the booster has to be connected to the aerial socket, but nothing needs to be connected to the booster output; so long as the booster is connected and switched on, the TV in a neighbouring room will work. It's as though it is somehow sending the amplified signal back up its input cable. But I've looked at circuit diagrams for boosters, and that doesn't look possible. Can anyone explain what is going on?


  2. I am trying to find out what is wrong in the rooms where no signal is ever reported. I read somewhere that if I look across the terminals of the TV socket with an ohmmeter, I should see effectively zero resistance, since there is continuity through the aerial. However, this is not true for any of my sockets. With all devices disconnected, if I look at the resistance at the socket the booster normally connects to, I see about 4k. If I look across any of the other sockets (including those where a signal is successfully received), I see no continuity at all. So I suppose that the passive splitter must have a capacitor or transformer somewhere in its circuitry, but I can't find a circuit diagram anywhere that would show whether this is true. Can anyone say whether this is the case, i.e. whether I should be able to see continuity when looking into a socket?



Background information:




  • Until recently we have never tried to use TVs in the rooms where we now find they don't work, so this is probably not a new problem.

  • In particular, the non-functioning sockets have not been used since the analogue era.

  • The wiring is probably at least 30 years old, and certainly pre-digital.

  • I'm in the UK, and the TV signal is digital terrestrial.

  • Fitting an outdoor aerial to get a better original signal is not an option in our neighbourhood.

  • The passive splitter and aerial connections are all screw-downs, and they are not conveniently located, so swapping cables around for test purposes is slow and painful.







amplifier antenna tv






share|improve this question









New contributor




seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited yesterday









Dave Tweed

123k10153267




123k10153267






New contributor




seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked yesterday









segleaseglea

412




412




New contributor




seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






seglea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • $begingroup$
    I don't think you can get sensible readings when poking an ohmmeter into antenna sockets that are being driven with RF energy signal. One thing might be that the signal is too strong so it kind of blindfolds the TV analog RF frontend so it can't see the signal. Then when you have some loads connected like the booster, it is a load that reduces power to other device that can then see the signal better. So maybe you just need more attenuation between TV and antenna socket.
    $endgroup$
    – Justme
    yesterday












  • $begingroup$
    If cables are unterminated they can represent harmonic 1/4 wave short circuits at those wavelengths to some rooms on some channels. But poor cable shields nicked can also degrade signals.
    $endgroup$
    – Sunnyskyguy EE75
    yesterday




















  • $begingroup$
    I don't think you can get sensible readings when poking an ohmmeter into antenna sockets that are being driven with RF energy signal. One thing might be that the signal is too strong so it kind of blindfolds the TV analog RF frontend so it can't see the signal. Then when you have some loads connected like the booster, it is a load that reduces power to other device that can then see the signal better. So maybe you just need more attenuation between TV and antenna socket.
    $endgroup$
    – Justme
    yesterday












  • $begingroup$
    If cables are unterminated they can represent harmonic 1/4 wave short circuits at those wavelengths to some rooms on some channels. But poor cable shields nicked can also degrade signals.
    $endgroup$
    – Sunnyskyguy EE75
    yesterday


















$begingroup$
I don't think you can get sensible readings when poking an ohmmeter into antenna sockets that are being driven with RF energy signal. One thing might be that the signal is too strong so it kind of blindfolds the TV analog RF frontend so it can't see the signal. Then when you have some loads connected like the booster, it is a load that reduces power to other device that can then see the signal better. So maybe you just need more attenuation between TV and antenna socket.
$endgroup$
– Justme
yesterday






$begingroup$
I don't think you can get sensible readings when poking an ohmmeter into antenna sockets that are being driven with RF energy signal. One thing might be that the signal is too strong so it kind of blindfolds the TV analog RF frontend so it can't see the signal. Then when you have some loads connected like the booster, it is a load that reduces power to other device that can then see the signal better. So maybe you just need more attenuation between TV and antenna socket.
$endgroup$
– Justme
yesterday














$begingroup$
If cables are unterminated they can represent harmonic 1/4 wave short circuits at those wavelengths to some rooms on some channels. But poor cable shields nicked can also degrade signals.
$endgroup$
– Sunnyskyguy EE75
yesterday






$begingroup$
If cables are unterminated they can represent harmonic 1/4 wave short circuits at those wavelengths to some rooms on some channels. But poor cable shields nicked can also degrade signals.
$endgroup$
– Sunnyskyguy EE75
yesterday












2 Answers
2






active

oldest

votes


















18












$begingroup$

You've made some wrong assumptions about what the parts of the system are. The part you're describing as a non-powered passive splitter is actually a powered active splitter. Splitting one aerial signal into six with a passive splitter is unlikely to give you sufficient signal on any of the six outputs, especially if the aerial is in the loft.



The part you're describing as the booster is just the power supply to the active splitter. It sends a DC voltage up the cable running to the active splitter, and filters it out of the cable running to the TV. That's why it has to be powered up for any of the TVs to work.



The rooms where TVs don't work are either down to a faulty output from the splitter or a defective cable. To do a basic test on each cable, disconnect it from the splitter and check that it's open circuit, then short one end together and check that it now shows a short circuit at the other end.






share|improve this answer









$endgroup$





















    1












    $begingroup$

    It is desirable to have the amplifier be as close to the aerial as possible and certainly prior to the signal being split, however getting mains power to said locations is often problematic.



    The solution to this is amplifiers that are powered via one of the output coax lines. The amplifier is sited close to the aerial while a power injection unit is sited close to the TV, These are often sold as "masthead" amplifiers. I believe this is the setup you have.



    I don't think you can read much into whether or not there is DC continuity on the output of an amplifier, whether you see it or not depends entirely on the details of the amplifiers internal circuitry.



    I would start with end to end continuity and short-circuit tests on the cable runs (note: some sockets have isolation capacitors, so you may need to test from the terminals on the back of the sockets rather than the connections on the face). If you find any opens or shorts then you obviously need to fix them.



    Failing that it may be worth swapping around connections to see if the problem follows the cable or follows the connection on the amplifier, but honestly given the age of the amplifier and the difficulty to access i'd be more inclined towards replacing the amplifier at that point.






    share|improve this answer









    $endgroup$













    • $begingroup$
      Can an active/powered TV splitter be used to split a coaxial SPDIF digital audio signal into two outputs with the same signal? With the appropriate physical connector adaption and on the basis that TV splitters handle high frequency signals, I would have thought this would be possible.
      $endgroup$
      – therobyouknow
      15 hours ago










    • $begingroup$
      @therobyouknow sounds like a different question - it could go either way, the powered splitter might filter out signals that aren't in the TV band.
      $endgroup$
      – pjc50
      12 hours ago










    • $begingroup$
      I think it is pretty unlikely that a TV amplifier would work for s/pdif. Firstly because I doubt the frequency range would reach down low enough, secondly because the voltage levels are very different, thirdly because radio receivers are designed to tolerate a wide range of signal levels while systems like s/pdif are not. From some googling it seems that normal TV signal levels are about 45-70 dBuV which works out to about about 200uV to 3mV, wheras S/PDIF is up in the hundreds of millivolts.
      $endgroup$
      – Peter Green
      10 hours ago












    Your Answer





    StackExchange.ifUsing("editor", function () {
    return StackExchange.using("mathjaxEditing", function () {
    StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
    StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
    });
    });
    }, "mathjax-editing");

    StackExchange.ifUsing("editor", function () {
    return StackExchange.using("schematics", function () {
    StackExchange.schematics.init();
    });
    }, "cicuitlab");

    StackExchange.ready(function() {
    var channelOptions = {
    tags: "".split(" "),
    id: "135"
    };
    initTagRenderer("".split(" "), "".split(" "), channelOptions);

    StackExchange.using("externalEditor", function() {
    // Have to fire editor after snippets, if snippets enabled
    if (StackExchange.settings.snippets.snippetsEnabled) {
    StackExchange.using("snippets", function() {
    createEditor();
    });
    }
    else {
    createEditor();
    }
    });

    function createEditor() {
    StackExchange.prepareEditor({
    heartbeatType: 'answer',
    autoActivateHeartbeat: false,
    convertImagesToLinks: false,
    noModals: true,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: null,
    bindNavPrevention: true,
    postfix: "",
    imageUploader: {
    brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
    contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
    allowUrls: true
    },
    onDemand: true,
    discardSelector: ".discard-answer"
    ,immediatelyShowMarkdownHelp:true
    });


    }
    });






    seglea is a new contributor. Be nice, and check out our Code of Conduct.










    draft saved

    draft discarded


















    StackExchange.ready(
    function () {
    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f431317%2fcircuitry-of-tv-splitters%23new-answer', 'question_page');
    }
    );

    Post as a guest















    Required, but never shown

























    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    18












    $begingroup$

    You've made some wrong assumptions about what the parts of the system are. The part you're describing as a non-powered passive splitter is actually a powered active splitter. Splitting one aerial signal into six with a passive splitter is unlikely to give you sufficient signal on any of the six outputs, especially if the aerial is in the loft.



    The part you're describing as the booster is just the power supply to the active splitter. It sends a DC voltage up the cable running to the active splitter, and filters it out of the cable running to the TV. That's why it has to be powered up for any of the TVs to work.



    The rooms where TVs don't work are either down to a faulty output from the splitter or a defective cable. To do a basic test on each cable, disconnect it from the splitter and check that it's open circuit, then short one end together and check that it now shows a short circuit at the other end.






    share|improve this answer









    $endgroup$


















      18












      $begingroup$

      You've made some wrong assumptions about what the parts of the system are. The part you're describing as a non-powered passive splitter is actually a powered active splitter. Splitting one aerial signal into six with a passive splitter is unlikely to give you sufficient signal on any of the six outputs, especially if the aerial is in the loft.



      The part you're describing as the booster is just the power supply to the active splitter. It sends a DC voltage up the cable running to the active splitter, and filters it out of the cable running to the TV. That's why it has to be powered up for any of the TVs to work.



      The rooms where TVs don't work are either down to a faulty output from the splitter or a defective cable. To do a basic test on each cable, disconnect it from the splitter and check that it's open circuit, then short one end together and check that it now shows a short circuit at the other end.






      share|improve this answer









      $endgroup$
















        18












        18








        18





        $begingroup$

        You've made some wrong assumptions about what the parts of the system are. The part you're describing as a non-powered passive splitter is actually a powered active splitter. Splitting one aerial signal into six with a passive splitter is unlikely to give you sufficient signal on any of the six outputs, especially if the aerial is in the loft.



        The part you're describing as the booster is just the power supply to the active splitter. It sends a DC voltage up the cable running to the active splitter, and filters it out of the cable running to the TV. That's why it has to be powered up for any of the TVs to work.



        The rooms where TVs don't work are either down to a faulty output from the splitter or a defective cable. To do a basic test on each cable, disconnect it from the splitter and check that it's open circuit, then short one end together and check that it now shows a short circuit at the other end.






        share|improve this answer









        $endgroup$



        You've made some wrong assumptions about what the parts of the system are. The part you're describing as a non-powered passive splitter is actually a powered active splitter. Splitting one aerial signal into six with a passive splitter is unlikely to give you sufficient signal on any of the six outputs, especially if the aerial is in the loft.



        The part you're describing as the booster is just the power supply to the active splitter. It sends a DC voltage up the cable running to the active splitter, and filters it out of the cable running to the TV. That's why it has to be powered up for any of the TVs to work.



        The rooms where TVs don't work are either down to a faulty output from the splitter or a defective cable. To do a basic test on each cable, disconnect it from the splitter and check that it's open circuit, then short one end together and check that it now shows a short circuit at the other end.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered yesterday









        FinbarrFinbarr

        3,9071925




        3,9071925

























            1












            $begingroup$

            It is desirable to have the amplifier be as close to the aerial as possible and certainly prior to the signal being split, however getting mains power to said locations is often problematic.



            The solution to this is amplifiers that are powered via one of the output coax lines. The amplifier is sited close to the aerial while a power injection unit is sited close to the TV, These are often sold as "masthead" amplifiers. I believe this is the setup you have.



            I don't think you can read much into whether or not there is DC continuity on the output of an amplifier, whether you see it or not depends entirely on the details of the amplifiers internal circuitry.



            I would start with end to end continuity and short-circuit tests on the cable runs (note: some sockets have isolation capacitors, so you may need to test from the terminals on the back of the sockets rather than the connections on the face). If you find any opens or shorts then you obviously need to fix them.



            Failing that it may be worth swapping around connections to see if the problem follows the cable or follows the connection on the amplifier, but honestly given the age of the amplifier and the difficulty to access i'd be more inclined towards replacing the amplifier at that point.






            share|improve this answer









            $endgroup$













            • $begingroup$
              Can an active/powered TV splitter be used to split a coaxial SPDIF digital audio signal into two outputs with the same signal? With the appropriate physical connector adaption and on the basis that TV splitters handle high frequency signals, I would have thought this would be possible.
              $endgroup$
              – therobyouknow
              15 hours ago










            • $begingroup$
              @therobyouknow sounds like a different question - it could go either way, the powered splitter might filter out signals that aren't in the TV band.
              $endgroup$
              – pjc50
              12 hours ago










            • $begingroup$
              I think it is pretty unlikely that a TV amplifier would work for s/pdif. Firstly because I doubt the frequency range would reach down low enough, secondly because the voltage levels are very different, thirdly because radio receivers are designed to tolerate a wide range of signal levels while systems like s/pdif are not. From some googling it seems that normal TV signal levels are about 45-70 dBuV which works out to about about 200uV to 3mV, wheras S/PDIF is up in the hundreds of millivolts.
              $endgroup$
              – Peter Green
              10 hours ago
















            1












            $begingroup$

            It is desirable to have the amplifier be as close to the aerial as possible and certainly prior to the signal being split, however getting mains power to said locations is often problematic.



            The solution to this is amplifiers that are powered via one of the output coax lines. The amplifier is sited close to the aerial while a power injection unit is sited close to the TV, These are often sold as "masthead" amplifiers. I believe this is the setup you have.



            I don't think you can read much into whether or not there is DC continuity on the output of an amplifier, whether you see it or not depends entirely on the details of the amplifiers internal circuitry.



            I would start with end to end continuity and short-circuit tests on the cable runs (note: some sockets have isolation capacitors, so you may need to test from the terminals on the back of the sockets rather than the connections on the face). If you find any opens or shorts then you obviously need to fix them.



            Failing that it may be worth swapping around connections to see if the problem follows the cable or follows the connection on the amplifier, but honestly given the age of the amplifier and the difficulty to access i'd be more inclined towards replacing the amplifier at that point.






            share|improve this answer









            $endgroup$













            • $begingroup$
              Can an active/powered TV splitter be used to split a coaxial SPDIF digital audio signal into two outputs with the same signal? With the appropriate physical connector adaption and on the basis that TV splitters handle high frequency signals, I would have thought this would be possible.
              $endgroup$
              – therobyouknow
              15 hours ago










            • $begingroup$
              @therobyouknow sounds like a different question - it could go either way, the powered splitter might filter out signals that aren't in the TV band.
              $endgroup$
              – pjc50
              12 hours ago










            • $begingroup$
              I think it is pretty unlikely that a TV amplifier would work for s/pdif. Firstly because I doubt the frequency range would reach down low enough, secondly because the voltage levels are very different, thirdly because radio receivers are designed to tolerate a wide range of signal levels while systems like s/pdif are not. From some googling it seems that normal TV signal levels are about 45-70 dBuV which works out to about about 200uV to 3mV, wheras S/PDIF is up in the hundreds of millivolts.
              $endgroup$
              – Peter Green
              10 hours ago














            1












            1








            1





            $begingroup$

            It is desirable to have the amplifier be as close to the aerial as possible and certainly prior to the signal being split, however getting mains power to said locations is often problematic.



            The solution to this is amplifiers that are powered via one of the output coax lines. The amplifier is sited close to the aerial while a power injection unit is sited close to the TV, These are often sold as "masthead" amplifiers. I believe this is the setup you have.



            I don't think you can read much into whether or not there is DC continuity on the output of an amplifier, whether you see it or not depends entirely on the details of the amplifiers internal circuitry.



            I would start with end to end continuity and short-circuit tests on the cable runs (note: some sockets have isolation capacitors, so you may need to test from the terminals on the back of the sockets rather than the connections on the face). If you find any opens or shorts then you obviously need to fix them.



            Failing that it may be worth swapping around connections to see if the problem follows the cable or follows the connection on the amplifier, but honestly given the age of the amplifier and the difficulty to access i'd be more inclined towards replacing the amplifier at that point.






            share|improve this answer









            $endgroup$



            It is desirable to have the amplifier be as close to the aerial as possible and certainly prior to the signal being split, however getting mains power to said locations is often problematic.



            The solution to this is amplifiers that are powered via one of the output coax lines. The amplifier is sited close to the aerial while a power injection unit is sited close to the TV, These are often sold as "masthead" amplifiers. I believe this is the setup you have.



            I don't think you can read much into whether or not there is DC continuity on the output of an amplifier, whether you see it or not depends entirely on the details of the amplifiers internal circuitry.



            I would start with end to end continuity and short-circuit tests on the cable runs (note: some sockets have isolation capacitors, so you may need to test from the terminals on the back of the sockets rather than the connections on the face). If you find any opens or shorts then you obviously need to fix them.



            Failing that it may be worth swapping around connections to see if the problem follows the cable or follows the connection on the amplifier, but honestly given the age of the amplifier and the difficulty to access i'd be more inclined towards replacing the amplifier at that point.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered yesterday









            Peter GreenPeter Green

            11.9k11940




            11.9k11940












            • $begingroup$
              Can an active/powered TV splitter be used to split a coaxial SPDIF digital audio signal into two outputs with the same signal? With the appropriate physical connector adaption and on the basis that TV splitters handle high frequency signals, I would have thought this would be possible.
              $endgroup$
              – therobyouknow
              15 hours ago










            • $begingroup$
              @therobyouknow sounds like a different question - it could go either way, the powered splitter might filter out signals that aren't in the TV band.
              $endgroup$
              – pjc50
              12 hours ago










            • $begingroup$
              I think it is pretty unlikely that a TV amplifier would work for s/pdif. Firstly because I doubt the frequency range would reach down low enough, secondly because the voltage levels are very different, thirdly because radio receivers are designed to tolerate a wide range of signal levels while systems like s/pdif are not. From some googling it seems that normal TV signal levels are about 45-70 dBuV which works out to about about 200uV to 3mV, wheras S/PDIF is up in the hundreds of millivolts.
              $endgroup$
              – Peter Green
              10 hours ago


















            • $begingroup$
              Can an active/powered TV splitter be used to split a coaxial SPDIF digital audio signal into two outputs with the same signal? With the appropriate physical connector adaption and on the basis that TV splitters handle high frequency signals, I would have thought this would be possible.
              $endgroup$
              – therobyouknow
              15 hours ago










            • $begingroup$
              @therobyouknow sounds like a different question - it could go either way, the powered splitter might filter out signals that aren't in the TV band.
              $endgroup$
              – pjc50
              12 hours ago










            • $begingroup$
              I think it is pretty unlikely that a TV amplifier would work for s/pdif. Firstly because I doubt the frequency range would reach down low enough, secondly because the voltage levels are very different, thirdly because radio receivers are designed to tolerate a wide range of signal levels while systems like s/pdif are not. From some googling it seems that normal TV signal levels are about 45-70 dBuV which works out to about about 200uV to 3mV, wheras S/PDIF is up in the hundreds of millivolts.
              $endgroup$
              – Peter Green
              10 hours ago
















            $begingroup$
            Can an active/powered TV splitter be used to split a coaxial SPDIF digital audio signal into two outputs with the same signal? With the appropriate physical connector adaption and on the basis that TV splitters handle high frequency signals, I would have thought this would be possible.
            $endgroup$
            – therobyouknow
            15 hours ago




            $begingroup$
            Can an active/powered TV splitter be used to split a coaxial SPDIF digital audio signal into two outputs with the same signal? With the appropriate physical connector adaption and on the basis that TV splitters handle high frequency signals, I would have thought this would be possible.
            $endgroup$
            – therobyouknow
            15 hours ago












            $begingroup$
            @therobyouknow sounds like a different question - it could go either way, the powered splitter might filter out signals that aren't in the TV band.
            $endgroup$
            – pjc50
            12 hours ago




            $begingroup$
            @therobyouknow sounds like a different question - it could go either way, the powered splitter might filter out signals that aren't in the TV band.
            $endgroup$
            – pjc50
            12 hours ago












            $begingroup$
            I think it is pretty unlikely that a TV amplifier would work for s/pdif. Firstly because I doubt the frequency range would reach down low enough, secondly because the voltage levels are very different, thirdly because radio receivers are designed to tolerate a wide range of signal levels while systems like s/pdif are not. From some googling it seems that normal TV signal levels are about 45-70 dBuV which works out to about about 200uV to 3mV, wheras S/PDIF is up in the hundreds of millivolts.
            $endgroup$
            – Peter Green
            10 hours ago




            $begingroup$
            I think it is pretty unlikely that a TV amplifier would work for s/pdif. Firstly because I doubt the frequency range would reach down low enough, secondly because the voltage levels are very different, thirdly because radio receivers are designed to tolerate a wide range of signal levels while systems like s/pdif are not. From some googling it seems that normal TV signal levels are about 45-70 dBuV which works out to about about 200uV to 3mV, wheras S/PDIF is up in the hundreds of millivolts.
            $endgroup$
            – Peter Green
            10 hours ago










            seglea is a new contributor. Be nice, and check out our Code of Conduct.










            draft saved

            draft discarded


















            seglea is a new contributor. Be nice, and check out our Code of Conduct.













            seglea is a new contributor. Be nice, and check out our Code of Conduct.












            seglea is a new contributor. Be nice, and check out our Code of Conduct.
















            Thanks for contributing an answer to Electrical Engineering Stack Exchange!


            • Please be sure to answer the question. Provide details and share your research!

            But avoid



            • Asking for help, clarification, or responding to other answers.

            • Making statements based on opinion; back them up with references or personal experience.


            Use MathJax to format equations. MathJax reference.


            To learn more, see our tips on writing great answers.




            draft saved


            draft discarded














            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f431317%2fcircuitry-of-tv-splitters%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown





















































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown

































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown







            Popular posts from this blog

            El tren de la libertad Índice Antecedentes "Porque yo decido" Desarrollo de la...

            Castillo d'Acher Características Menú de navegación

            Puerta de Hutt Referencias Enlaces externos Menú de navegación15°58′00″S 5°42′00″O /...