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DIY cables, antennas, interferences, etc...

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  • findeciclo
    Experienced Board Member
    • Oct 2010
    • 910

    DIY cables, antennas, interferences, etc...

    One of the repairs or DIY tasks common in the home is often installing or modifying the antenna wire run. Well because we have to change the situation of the television receiver, either because we have to install a new TV recently acquired.
    First you have to keep in mind that a connection on an antenna will not be equal to what would in a conventional power cord.
    In fact in this connection our main concern must be to avoid interference, isolate our potential parasites cable television signal spoilage.
    The best option is always placed an antenna jack in each room, and new homes and are usually included, but if we have no choice but to build a ... additional wiring.
    The antenna cable is coaxial, ie comprises a conductive core coated by an insulating layer which in turn is covered, shielded by a metal mesh.
    The whole is inside a plastic sleeve insulation. The function of the mesh will be to protect, shield, the signal flow through the inner conductor. It is important not to damage the shield and we would lose quality.
    If we make a bad connection between two antenna cables, or if the plug is damaged, we will change the impedance which will result in an alteration of the transmitted signal, ie, the image will lose quality. Similarly if we use an antenna cable too long also weaken the signal and lose image quality.
    The best way to make a referral to connect two devices at the same antenna is used making a "T" junction. The "T" is connected to the antenna jack on the wall freeing female connectors so that we can connect the antenna cable to two different devices.
    The precaution that we take is that the distance between the feeder and the device should not be too big or lose quality.
    If we want to create multiple aerial shots from a single cable we resort to using a dealer. The dealer will keep the impedance, but will weaken the signal proportional to the number of shots you want to install.
    If the signal is too weak at the dealer, or the antenna cable that we install is too long (several meters) need to install an antenna amplifier in the path. Located between the TV and aerial socket.
    The mission of the antenna amplifier, as its name suggests, is to amplify the signal by multiplying its power.

    In much of the existing houses, one of the largest electrical equipment is the television everyday, so it is also the most suffering minor problems.
    But if we were to specify which of the components of the TV is causing more headaches, this is definitely the antenna connection. To avoid disturbing your arrangement involves expect from an expert, we offer you how to correct some simple repairs.
    First of all, keep in mind that ...
    - The isolation of the high frequency has little to do with electrical power, which mainly serves as protect it from disturbances caused by driving next.

    - The TV antenna is connected to the outside by a coaxial cable, consisting of a wire, protected by an insulator, and a braid of dough as a second driver, todoello surrounded by a protective sheath.

    It is therefore advisable not to use extension cords. If necessary, it is preferable to replace the cable with a new, longer.

    - For a fixed receiver, the connection will come directly from the antenna, without any joint, ending its journey in a plug that will stay in the receptacle provided for the antenna to the receiver.

    - A faulty connection or a cable too long can reduce the impedance of the cable, which will result in a proportional weakening of the transmitted signal, which alter the quality of the image.
    Connect two devices at the same aerial socket


    Nothing is easier than making a referral to connect two televisions to the same power antenna.
    This requires use what is called a T junction. This is a plug that connects to the outlet of the antenna, provided with two female sockets which plug the cable plugs of the two televisions.

    If both devices are not separated more than a few meters, and if the point of reception is not too far from the transmitter, this can be a very effective solution.
    Installing multiple antenna jacks


    If you want to have multiple antenna outlets, including installing TVs in several rooms, then you must resort to a dealer.
    A dealer is a junction box which has the advantage of maintaining the 75 ohm impedance for each of the shots.

    The dealer is installed in the most appropriate place to make connections as short as possible.
    This accessory has only one drawback: it can weaken the image, up to 25% of the signal distributors for two shots and up to 50% in dealers for three or four shots.
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  • fandm
    Experienced Board Member
    • Aug 2011
    • 634

    #2
    Re: DIY cables, antennas, interferences, etc...

    you cannot amplify the voltage that is need to control the sat motor if you get to long a drag in the cable.
    Also if you get a weak signal on the rf side and it weakens the signal to much then you amplify it you will also amplify the crap.
    but in a normal house that should not be a problem, the only time it will be a problem is taking to many feeds of the system.

    Comment

    • findeciclo
      Experienced Board Member
      • Oct 2010
      • 910

      #3
      Re: DIY cables, antennas, interferences, etc...

      Originally posted by fandm
      you cannot amplify the voltage that is need to control the sat motor if you get to long a drag in the cable.
      Also if you get a weak signal on the rf side and it weakens the signal to much then you amplify it you will also amplify the crap.
      but in a normal house that should not be a problem, the only time it will be a problem is taking to many feeds of the system.
      In this theme I´m not talking about sat installation, in this section we can talk about terrestial tv too, so this post is more useful for terrestial than sat installations.

      Regards and thanks about your answer.
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