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Need help - no signal from TV antenna in the attic

Discussion in 'Electronic Repair' started by [email protected], Dec 4, 2008.

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  1. Shawn Hirn

    Shawn Hirn Guest

    My guess is the splitter is defective. Splitters are very inexpensive,
    so try replacing it.
     
  2. RickMerrill

    RickMerrill Guest

    And old splitters were low freq. Replacing is a good idea.
     
  3. Jeroni Paul

    Jeroni Paul Guest

    Why is everyone guessing the same? The poster said:
    which discards the splitter as a possible culprit. It must be these
    cables going downstairs.
     
  4. If you are sure that the original poster means that he disconnected one of
    the cables that goes downstairs and connected it to the cable from the
    antenna. What he said could also be interpreted to mean that he
    disconnected a cable from one of the splitter outputs and connected the
    cable from the antenna to this output (which of course would do nothing).
    Nothing surprises me anymore. Anyhow, I guess if all else fails he can
    connect a known good cable from the antenna to a new splitter(plus amplifier
    if needed) and run four new cables from the splitter down to his 4 tv's.
    Not a terribly difficult job if you've done this sort of thing before.

    Why is everyone guessing the same? The poster said:
    which discards the splitter as a possible culprit. It must be these
    cables going downstairs.
     
  5. Ron

    Ron Guest

    Reread the post, he has an amp. Now granted, it's not a splitter/amp,
    and that might make a difference, but there are ONLY two
    possibilities.

    Either the cable from the ant to the amp to the splitter is bad, or
    the splitter is bad.
     
  6. RickMerrill

    RickMerrill Guest

    As another poster said first, a 4-way unamplified splitter just will not
    work with antenna, althought it will work with cable. This leads to a
    solution for the OP: get an amplified splitter OR connect just 1 tv,
    which I think they did.
     
  7. Jeroni Paul

    Jeroni Paul Guest

    Even though it drops the signal by some dBs it still can work if the
    antenna signal is good. It does for me, no amplifier required. Most of
    the channels here come from the same repeater and are well equalized,
    they remain strong enough for a snow free tuning after one or two
    unamplified splitters.
     
  8. RickMerrill

    RickMerrill Guest


    You're right, of course. I was in my country-mouse mode and not thinking
    of the city-mouse who gets a much stronger signal!
     
  9. UCLAN

    UCLAN Guest

    It's easy to test coaxial cable, no matter the length. Simply screw on a
    75 ohm termination cap at one end, and measure from center conductor to the
    ground shield at the other end. The ohmmeter will read 75 ohms plus whatever
    the impedance of the cable is.
     
  10. Actually it won't. The impedance is at RF frequencies, the resistance is
    at DC. The DC resistance of coax is close to 0, being the sum of the DC
    resistance of the center conductor and the shield.

    Resistance meters measure using DC or relatively low frequency AC, it
    will be very close to 0.

    Geoff.
     
  11. Ron

    Ron Guest

    Not with MY cable. That POS is what was in my current home when I
    bought it and it was like watching TV in a blizzard.
     
  12. UCLAN

    UCLAN Guest

    The OP's report of NO signal present is more indicative of an open rather
    than a high impedance at some RF frequency
    Not with the 75 ohm terminating cap. It will be at least 75 ohms unless
    there is a short somewhere in parallel with the 75 ohms.
     
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