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Coaxial Socket? Amplifier?

Longeen -  
Andy31200 Posted messages 26918 Registration date   Status Moderator Last intervention   -
Hello everyone!

My name is Nico, I'm 26 years old, and I took a look at my TV cables a few days ago. Indeed, I had some interference on my screen, so I decided to check it out.

The installations are at least 20 years old.

I see a splitter, I push my coaxial cable into it well, no worries.

Then I see a sort of black coaxial T in pretty bad shape!

On the left, a male connector connected to my splitter.
On the right, a female connector connected to a coaxial cable coming out of my wall.
At the base: a wire that connects it to the power supply!

If I unplug the thing, there's no TV reception at my place...

But it's impossible to know what this piece is! It’s just marked "TV" and "Amp" on the branches of the T... If that helps.

I would like to replace this piece that messes up the whole system a bit.

I’ll take a picture tomorrow afternoon if that can help you!

Thank you very much!

5 answers

  1. Gil
     
    A molded T is an accessory reserved for the division of video or audio. It is prohibited on TV...

    A splitter or a power splitter/amplifier or an amplifier or a preamplifier + splitter + power supply is encountered to distribute terrestrial digital TV (TNT) in several rooms of a house.

    See TNT forum...
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  2. Longeen
     
    I think we haven't understood each other well x).

    I followed the cable from my TV, which led me to the faulty room. And to change it, I need to know what it is ;). I know a few terms, but otherwise I really don't know anything about TV connections!

    I took a picture of the thing:

    http://imgur.com/wS28cZz

    On the left, we see the "splitter," which is connected to what I call the Tee on the left (marked TV), and on the right the cable that is no longer holding (marked Amplifier).
    Everything connected to power (cable going down).

    Do you know what it is?
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    1. Gil
       
      this is a T electric power supply injector for preamp or amp ...
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      1. Longeen > Gil
         
        Thank you very much!

        Do you know where I could get this type of part? I can't find much online.
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  3. Andy31200 Posted messages 26918 Registration date   Status Moderator Last intervention   12 203
     
    If it’s a splitter on the left, then you have two TV outlets in your house, right?
    This T, as Gil says, is a power supply that sends juice to an antenna amplifier via the antenna cable that goes into your wall on the right.
    In short, this T on the right powers a pre-amplifier “somewhere” and then distributes the amplified signal through the left outlet, which splits it into your two outlets.
    So check for the presence of a pre-amplifier box on the antenna mast (or in the attic or elsewhere), and I’ll get back to you later to advise you on what to replace all this stuff with.

    I call a spade a spade *
         *in French in the text
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    1. Andy31200 Posted messages 26918 Registration date   Status Moderator Last intervention   12 203
       
      So if your setup is exactly what I'm describing, take everything apart and replace it with this:
      http://www.fnac.com/mp23356824/Axitronic-kit252160-kit-preamplification/w-4
      If it's not on sale, here:
      http://www.connectea.fr/amplificateurs-d-interieur-preamplificateurs-de-mat-et-filtres/237-kit-preamplificateur-25-db-alimentation-2-sorties-2160-lte-axitronic-kit252160-3660834350312.html
      The preamp case should be installed in place of your current preamp (on the mast or in the attic); it complies with current LTE standards to filter any potential interference with 4G mobile telephony.
      The T and the splitter will be replaced by the power supply box to be connected to the mains, which also acts as a splitter.
      You will need to connect all this with five "F" connectors that are to be screwed on; it's safer:
      http://www.opensys-distribution.com/fichiers_site/a2092xeo/produits/fiche_f_a_visser.jpg
      They are mounted like this:
      https://img.imagesia.com/fichiers/1f/antenne-satellite-connectique-denudage-cable-montage-fiche-f-raccordement-connex_imagesia-com_1fs5_large.png
      And be careful that not a single "hair" of the braid is in contact with the copper core.
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    2. Longeen
       
      Thank you for your very thorough response!

      Yes, I do have several TVs at home.

      To be honest, I'm a bit afraid to start dismantling everything.

      Tomorrow, I'll take some pictures of the splitter if you need, and I will go looking for the preamplifier. But if it's on the mast, I'm afraid I won't have the courage to climb onto the roof :D!
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    3. Andy31200 Posted messages 26918 Registration date   Status Moderator Last intervention   12 203
       
      It works, see you tomorrow then, but would it be possible to buy a power supply/distributor in one block? We would need to know the power supply voltage of the preamp in place (12 or 24 volts?) Nothing is marked on your T?
      "I'm a bit afraid to dive into taking all this apart to be honest."
      Don't worry, it's actually very simple, the issue is knowing where that f***ing preamp is...;-(
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    4. Longeen
       
      SoFirst, here is the power supply for the Té :

      http://imgur.com/DzKXU2b

      12V therefore

      BUT

      when unplugging, it did absolutely nothing! I still receive the TV from the floor below upstairs...

      I’m back to searching for the preamplifier!
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    5. Longeen
       
      Unavailable, it must be on the antenna ...

      By the way, I still have TV signal, but if I remove the T, I don't receive anything. So I'm wondering if a male-female adapter would be enough to just connect the cables.
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  4. Longeen
     
    If I unplug the coaxials from the splitter, it stops working.
    However, if I unplug the splitter from the power supply, it still works...

    I don't understand anything.
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    1. Andy31200 Posted messages 26918 Registration date   Status Moderator Last intervention   12 203
       
      There must be a preamp somewhere, crappy but letting the signal through. Try what I suggested:
      Try connecting the cable coming from the wall directly to the splitter, instead of the cable coming from the Tee.
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  6. Andy31200 Posted messages 26918 Registration date   Status Moderator Last intervention   12 203
     


    You need to dismantle the distributor
    I call a spade a spade *
         *in French in the text
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    1. Longeen
       
      So since I was too short, I connected the two coaxial cables together, and it works ... down below.

      In the attic, I only receive "Grand Lille Tv." The problem must be coming from the coaxial cable that I just changed.

      I'm going crazy. I'm questioning the splitter now. It's an old model where you have to push the core of the coaxial in.
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    3. Longeen
       
      Well, let's try to explain the new situation:

      http://imgur.com/aESjYYb

      You can see that I removed the T, connected the 2 Coax
      I changed the splitter, I identified the useless Coax

      So we have the splitter connected to my two TVs and to the antenna (where there is probably a disconnected preamplifier).

      The result: The TV in the living room receives everything without any problem, the TV in the attic (so 8m from the splitter) only receives a regional channel.

      How can you explain that by disconnecting the power supply of the preamplifier I was still receiving all the TNT channels, and now that I've fiddled with my coaxial and connected the two coax by removing the T, I no longer receive anything?
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    4. Longeen
       
      Well, we're doing better!

      I took the new coaxial, recut it, and put the connectors back one by one.

      I'm picking up signals! Well, I have a bit of static on channels 6, 9, or 11, but that must be because I don't have a preamp anymore!
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    5. Andy31200 Posted messages 26918 Registration date   Status Moderator Last intervention   12 203
       
      Because your preamplifier is no longer powered, you are receiving the regional channel as you must be near the transmitter.
      Once again, you should definitely try this:
      https://www.ebay.fr/itm/Alimentation-pour-Preamplificateur-Triax-ALF-200-12-Vcc-200-mA-2-Sorties-TV-/171916503921?hash=item280705ab71
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