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Transmitter design

Discussion in 'Electronic Design' started by IcedZ, Jul 23, 2007.

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  1. IcedZ

    IcedZ Guest

    I want to transmit video 100+ yards. I was wondering if there is a
    standard rule for approximately how far 1Watt will be receivable.
  2. Depends on bandwidth, frequency, receiver gain, link noise etc .

    With the right conditions 1W of transmitted power could be receivable on
    Earth when transmitted from Pluto .... and beyond
  3. IcedZ

    IcedZ Guest

    Obviously. but that isn't helpful for this. Any GENERAL rule for
    this? I am unsure of what frequency range I will be using, but it
    will probably be in the 100's of MHz range.
  4. LVMarc

    LVMarc Guest

    a 1 watt hand held radio would get out to about 1 KM.

    you cant send baseband video over the radio! this has to be modualted
    onto a carrier and snet that way..right!
  5. Eeyore

    Eeyore Guest

    No but there are rules for radio interference.

  6. No, there isn't. Somewhere between 10 meters and 55 km. You have not
    provided enough data. Please provide details:
    - Resolution (digital, analog?)
    - Frame rate
    - above helps determine required BW
    - Do you need to conform to a "standard"?
    - What type / size antennas can you provide?
    - How high are they?
    - is omnidirectional reception important?
    - do you have line of sight between transmitter and receiver?
    - is either the receiver or transmitter mobile?
    - can you tolerate dropouts? How many?
    - do you need audio too? (same questions as above)
    - what's your equipment budget?


  7. ehsjr

    ehsjr Guest

    If there's no intereference, the _minimum_ is line of sight.
    It will go at least as far as you can see, so your 100+
    yards is no problem. Put buildings and interfereing signals
    into the mix and that's a horse of a different color.

  8. ehsjr

    ehsjr Guest

  9. You NEVER know what you'll find on the net, do you? ;-)

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  10. Jasen Betts

    Jasen Betts Guest

    only the inverse square radiation law: to go twice as far you need
    four timnes the power.
    So VHF-high band or UHF. go look at some video sending appliances.

    if both ends are fixed locations directional antennas can reduce the
    power needs a lot.
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