Wireless cable (analog) TV transmitter circuit

Discussion in 'Wireless & RF Design' started by Willen, Sep 6, 2016.

  1. Willen

    Thread Starter Member

    Nov 13, 2015
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    Hi,
    First question is why analog cable do not radiates in the air even if I connected a sort wire (as antenna) to the core wire of cable TV? Yes it radiates few inches poorly or TV receives poor signal if I did so. Does it mean the signal of cable TV is so low to transmit in the air?

    Main question is, to transmit cable TV in the air such devices available : http://www.aitech.com/products/wirelesscabletv.htm But I am not getting simple version of toy cable TV transmitter 'circuit' around internet easily. There are just TV modulator (transmitter) available.

    The highest channel of my cable TV has 855MHz so I think I could experiment with few of S9018 (1.1GHz) transistors if I could find guidance circuit.
     
  2. wayneh

    Expert

    Sep 9, 2010
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    I'm no expert, but yes, the signal is far too small.

    I don't understand the question. What's wrong with the commercial products? What are you looking for but not finding?
     
  3. crutschow

    Expert

    Mar 14, 2008
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    You probably can't find simple circuits because broadcasting the whole wide-bandwidth cable TV signal is likely illegal.
     
  4. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Edit post #3 - completely illegal, even at 29,000 feet.

    ak
     
  5. Willen

    Thread Starter Member

    Nov 13, 2015
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    Probably it's not illegal to transmit around a room.
     
  6. crutschow

    Expert

    Mar 14, 2008
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    But how do you confine it to the room, unless it's a screen-room?
     
  7. Willen

    Thread Starter Member

    Nov 13, 2015
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    In my FM toy transmitter experience, a general purpose BJT OSC with 3V transmits just around room without antenna connected.

    I have an experience of jamming TV of my home too when I turned ON my DIY and poor man's regenarative FM receiver. I did't used that one any more.
     
  8. Sensacell

    Well-Known Member

    Jun 19, 2012
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  9. crutschow

    Expert

    Mar 14, 2008
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    Sensacell and Willen like this.
  10. Sensacell

    Well-Known Member

    Jun 19, 2012
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    My bad- misread the post.
    How about a "distribution amp"?

    dist_amp.jpg
     
  11. Willen

    Thread Starter Member

    Nov 13, 2015
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    Thank you sensacell, but for this moment I do not want to use professional devices. I just want to experiment and see. So I want to play with DIY circuits.
     
  12. crutschow

    Expert

    Mar 14, 2008
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    Unless you've had some experience with wide-band, high-frequency circuits, good luck with that. :rolleyes:
     
  13. Willen

    Thread Starter Member

    Nov 13, 2015
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