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TV splitter/amplifier question.

Discussion in 'Misc Electronics' started by [email protected], May 17, 2007.

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  1. Guest

    I live in a marginal reception area in South Australia. The Aerial was
    originally professionally installed and positioned to face the
    strongest signal direction.

    I've just bought a Plasma TV with built in HD digital and analog
    tuners and have an SD Digicrystal PVR. I have a powered amplifier
    which is connected to the back of the PVR, to the ANT IN socket at the
    moment. Using a Y splitter to watch HD on the TV is useless, one or
    the other unit doesn't get a strong enough signal to work, nor does
    the RF out on the PVR give a useable signal out to the HD TV.

    Currently there is an old style plastic cased splitter in the ceiling
    that has the cables directly wired into it.

    I bought an Antsig AP144 F connector 4 way splitter and a crimping
    tool for the connectors.

    The amplifier uses a standard male and a female TV connector.

    Is it better to connect the powered amplifier in the roof space BEFORE
    /TO the IN socket of the splitter or is it OK to leave it down below
    at the receivers and after the 4 way splitter? (I know that I will
    need to connect the amplifier to the Power Pass socket in this
    instance)

    And if I keep the amplifier below is it better to connect the Power
    Pass socket to the HD or the SD receivers?

    The new 4 way splitter will be 4 metres away from the receivers. Will
    it be better to have 2 x 4 metre cables (1 to Plasma and 1 to PVR) or
    1 x 4 metre cable to another 2 way splitter closer to the receivers
    with just a short 1 metre cable to each receiver?

    I'm looking for maximum signal strength at the receivers.

    Thanks in advance.
     
  2. Phil Allison

    Phil Allison Guest

    ( snip too much information... )


    ** The rules for handling TV antenna signals are simple.

    1. Amplify prior to splitting, never the other way around.

    2. Amplify as early in the signal chain as possible - preferably at the
    masthead itself.

    3. Weak or marginal signals cannot tolerate passive splitting.

    4. Use good quality cable and connectors.

    5. Keep all runs short as possible - especially for UHF signals.



    ......... Phil
     
  3. Guest

    Thanks Phil,

    Clear enough. The amplifier goes up top then.

    I asked about the possible extra splitter because I had previously
    heard that there was a loss from each break or connection in the
    cabling. I wondered if the number of connections outweighed short
    cable length advantage.

    I appreciate your help.
     
  4. Phil Allison

    Phil Allison Guest

    <

    ** Be aware that an indoor " booster amp " is not the same thing as a "
    masthead amp".

    All a matter of horses for courses.

    A masthead amp will usually have a significantly less noise and be remotely
    powered via the co-axial cable.


    ....... Phil



     
  5. Also search on http://www.siliconchip.com.au for terms like UHF, aerial,
    splitter, masthead amplifier etc.
     
  6. Phil Allison

    Phil Allison Guest

    "CWatters"

    ** In the capital cities, DTV is primarily on the VHF band with commercial
    broadcasters using long vacant adjacent channels for DTV - except for the
    govt broadcaster (on VHF2) which uses VHF12 for DVT.

    In rural areas, UHF is used for all signals.




    ......... Phil
     
  7. atec 77

    atec 77 Guest

    Best gaib is a masthead amp , have you considered spending a little more
    and adding an active switch , also know as a digital switch or
    distribution switch as the increased performance can mean you don't
    need an amp

    see http://www.gak.net.au/vk3khb/atv/chnlchrt.html
    for more information

    and http://www.matchmaster.com.au/


    and http://www.matchmaster.com.au/ see multiswitch on the lower right
     
  8. Cam

    Cam Guest

    Hutchy,

    Each output of your 4-way splitter will (ideally) be 1/4 of the level of the
    input. If you connect the amplifier to the TV side of the splitter,
    you will be amplifying a signal that may have suffered degradation due to
    the attenuation of the splitter.

    It sounds like you're using one of the small cast splitters with the
    threaded F-connectors. This will certainly be better than the plastic
    splitter and
    will suffer less signal loss if the cable are terminated carefully.

    I would place the amplifier between the splitter and the antenna making sure
    that the power supply is connected to the power pass-through output.
    This will amplify the signal at its best quality in your system and ensure
    you make the most of the signal you have.

    For the same reason as explained above, it would be technically better (but
    aesthetically not better) to have 2 x 4m cables instead of one cable and
    another splitter. In all reality, 4m of good quality, properly terminated
    coax won't attenuate the signal too much.

    The whole point of a power-pass socket is to allow the (usually) AC from the
    amplifier's power supply to travel through the splitter without being
    passed back to the other receivers you have plugged into the splitter.

    Cheers,

    Cam
     
  9. Guest

    Thanks to everyone for all the suggestions and helpfull references.

    I've started by getting some RG6 Quad shield and I'll replace all the
    old cables and fittings and wire up as per the suggestions so far.

    If that still isn't good enough I'll continue on to look at better
    aerials and distribution systems then. Hopefully I'll get away with
    the cheaper cable/fittings/configuration option, fingers crossed.

    Now all I need to do is to get the f connector crimping technique
    right! I can't seem to get the central core central enough! I'm not
    keen on buying any more tools for just 1/2 a dozen connections so
    practice, practice if my fingers can take many more wire splinters.

    If anyone else has been following this thread and will be doing
    similar, I found the following on fitting the connectors to the coax.

    http://www.interstateelectronics.com/howto/coaxterm.html

    http://www.dba.org.au/uploads/documents/Consumer_D.I.Y._140802_amend.pdf

    http://www.satcure.co.uk/tech/fconn.htm

    Thanks again guys, much appreciated.
     
  10. atec 77

    atec 77 Guest

    About 1/2 way down see the two blade rotary strip tool , worth about
    $25.00 and does the right cut everytime .
    most tool supply places will stock it .
     
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