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Wireless Audio/Video Transmitter

Discussion in 'Electronic Projects' started by faizanbrohi, Dec 22, 2006.

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  1. aqibzfr

    aqibzfr New Member

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    hi

    :)helo every one
     
  2. gotisoda dinesh

    gotisoda dinesh New Member

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    good your repotion
     
  3. bond000

    bond000 New Member

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  4. dave

    Dave New Member

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  5. rana jordan

    rana jordan New Member

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    well,,,good luck in that man
     
  6. Gulfsideweb

    Gulfsideweb New Member

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    wireless video transmitters.

    Hi everyone.
    I just purchased a video receiver model # PRX900B has any one used this before and know of this unit?

    Thanks John
     
  7. knaaphix

    knaaphix New Member

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    Thanks for the Data sheet i 'll try it
     
  8. p55xp

    p55xp Member

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    What is the substitute of BFY90, I think any high ft transistor will do.
    Please detail L1, L2, L3 windings, I am about to build this project!
    It is almost impossible to construct this inductors. Please give SWG for wire.

    Thanks
     
  9. butyokz

    butyokz New Member

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    it's really nice..but is this not compicated to do..
     
  10. p55xp

    p55xp Member

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    Construction of Inductors and tuning it to a channel for maximum efficiency is difficult. Otherwise it looks simple. To make a successful model more description is necessary.
     
  11. blinkstar88

    blinkstar88 New Member

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    TV Transmitter is complicated system, many people fail to make it because the wrong to choose amplifier type to boost the RF. You must using very linear amplifier because the amplifier will process Audio and Video in the same time and it have very wideband (about 8Mhz). I prefer you to use MMIC amplifier that have wideband, eg BG2709, UPC1678GV
     
  12. mbarazeen

    mbarazeen Member

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    Mansoor Ahmed,

    if you need a mono receiver try TDA7000 IC
     
  13. audioguru

    audioguru Well-Known Member Most Helpful Member

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    The TDA7000 is not made anymore.
    It was an extremely poor quality FM radio.
     
  14. evert384

    evert384 New Member

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    evert384@hotmail.com

    Hi there,

    I build a video-audio transmitter.
    I use the schematic from Henry from Indonesia and I must say "it works fine"!
    Frequency 470 - 860 Mhz, 15 mW.
    Tell me/us about your tv transmitter project.
    I can sent you the schematic and the HEX code for the PIC, let me now![

    Evert (from Holland)
     
  15. unclejed613

    unclejed613 Well-Known Member

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    somewhere in my boxes of stuff, i have a Blonder-Tongue agile modulator. there are a lot of cable TV companies that will likely be dumping these on the market soon. they can be switch set to any channel from 2 to 125 (cable). their output is 30dBm (1 watt). since the digital switchover, a lot of head-end equipment has become obsolete, while cable companies are still using analog, they will be upgrading their equipment anyway, which will translate into a lot of head-end modules out there, many of them will probably show up on e-slay or surplus electronics outlets.
     
  16. gauravjindal

    gauravjindal New Member

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    hey please help me ......tht i need a vhdl based project.......plz.
     
  17. gregcf8

    gregcf8 New Member

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    hi am new and need more circuits on tv transmitters of at least 2km range.
     
  18. audioguru

    audioguru Well-Known Member Most Helpful Member

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    It is illegal in most countries to be a TV station without a licence and without a certified transmitter.
     
  19. mbarazeen

    mbarazeen Member

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    its not an easy task to buold a transmitter even if you have circuit, frequency stability,tuning, and harmonics would be a great challange.

    if your interest is only to broadcast, then better try using a CATV modulator and some amplifier to boost it. make sure you are aware of local regulation for broadcasting.
     
  20. unclejed613

    unclejed613 Well-Known Member

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    here in the US, the new rules for "whitespace" are basically this:
    whitespace channels vacated by TV stations are license-free
    ERP must be 4 watts or less
    must keep the 6Mhz wide channel assignments (i.e. you can't do 7.5Mhz wide WiMax)
    cannot interfere with any licensed operations that may be present on the channel (there may be analog low power TV on some of the whitespace channels)
    cannot use channel 37
    cannot interfere with wireless microphone users
     
  21. gauravjindal

    gauravjindal New Member

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    hi everyone ....

    i am doing project on huffman coding ...and i started 4 days before .
    and i dont know how to convert string to std_logic_vector.....

    while i have use this method but this is not working please chek....and tell me best
    correction.


    (------

    library ieee;
    use ieee.std_logic_1164.all;
    use ieee.std_logic_arith.all;
    use ieee.numeric_bit.all;
    package utility_pkg is
    function Convert_From_String(str : STRING) return std_logic_vector;
    end utility_pkg;
    package body utility_pkg is
    function Convert_From_String(str : STRING) return std_logic_vector is
    variable result : std_logic_vector((str'length-1) downto 0) := (others => '-');
    variable index : INTEGER := str'length-1;
    variable str_1 : STRING(1 to 6);
    begin
    for i in str'range loop
    str_1(1) := str(i);
    result(index):=Convert_From_String(str_1);
    index := index - 1;
    end loop;
    return result;
    end Convert_From_String;

    end utility_pkg;
    ----) please check.....
     
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