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Keylock switch for coax?

Discussion in 'Electronic Basics' started by [email protected], Mar 2, 2007.

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  1. Guest

    I have spent time trying to Google this question, without much
    success. I am not an electronics whiz, but I am a computer tech and
    made my own fan speed controls and the like before such became so
    cheap to buy instead of build. I am trying to devise a way to build a
    key lock switch to interrupt the CATV signal to certain rooms in the
    house with TV's that don't have decent parental controls on them to
    prevent my children from abusing their TV privileges. I have found
    such a devices on line to interrupt service based on tokens, or a full
    lock-out, but it won't work well in my home data and CATV master
    control box recessed in the wall in the master bedroom
    closet...putting it in the closet will also reduce the chance the
    control box could be bypassed easily. I have a vague idea that I
    think MIGHT work, but I really could use someone with real electronics
    knowledge to provide some pointers or suggestions. I have worked with
    transistors, LEDS, heat shrink tubing, potentiometers and etc building
    my on fan control panels for my PC's when I had time to tinker with
    over-clocking, so I can use a soldering gun and a meter fairly well.
    And I wired my home with CAT5 and coax to each room. I just need some
    guidance to get me started, because I am not even sure of the
    calculations involved to run a CATV signal through a mechanical

    ANY tips or suggestions appreciated.


    You can add a 75 ohm resistor in series with the signal to the switch since
    it works 'backwards'. It'll be a mismatch but I imagine it'll be close
    enough. If you want to get fancy, add one switch to each output of a 4 or 5
    way splitter that feeds the rooms to be controlled.

    If you can find switches that have the Key removable in OFF position that's
    even easier.
  3. Guest

    Thank you, that was exactly what I needed, a hint of what to start
    looking for and thinking about. Of course, any other advice or
    suggestions is also welcome, but this tells me where to start. The
    switch for each output is also a good idea, and I imagine I will be
    glad I ran RG6 instead of RG59, even though it was harder to work

  4. Wim Lewis

    Wim Lewis Guest

    How about putting a non-keylock switch inside a locked box? It seems to
    me that using a switch not designed for impedance-matched 75-ohm circuits
    could result in reflections and such, leading to bad reception (ghosting?).
    Googling for "75 ohm switch" turns up plenty of cheap switches with F-type
    connectors, which are presumably the connectors you have on your coax
    already. It shouldn't be too hard to find a small lockable wiring-panel
    box and put the switch inside.

    Actually, it looks like MPJA might have exactly what you want, no
    locked box required:
    Scroll down to "Deluxe locking A/B switch".
    On the other hand, careful that you don't change your kids' perception
    of the situation from "should I disobey my parents and watch TV?" to
    "Here is an interesting technical challenge, and if I solve it I get to
    watch TV as a reward" :)
  5. quietguy

    quietguy Guest

    A much simpler, and much better for the kids, solution is to just remove
    the tv if the kids defy your directions re watching. And if your kids
    are that disobedient you have much bigger problems than figgering out
    switches etc

    David - who would impose a consequence rather than allow the kids to
    dictate terms
  6. Grostle News

    Grostle News Guest

    Parental control options are a selling point used by cable tv providers.
    If you haven't already done so, you might ask your cable company, they
    might have something that is ready-to-use for your needs.
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