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What's happening with this xmitter in a pipe?

Discussion in 'Electronic Basics' started by Eric R Snow, Jul 26, 2007.

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  1. Eric R Snow

    Eric R Snow Guest

    Greetings All,
    I had to drop a camera down a 6 inch diameter steel well casing to see
    what was going on. I used one of the tiny ubiquitous color cameras
    with a built in transmitter. I don't know the what the transmitting
    frequency is but the antenna wire is about 2 inches long. The camera
    was lowered down the well casing without touching the sides ar
    anything else. While watching the image on a little monitor the image
    would degrade in certain spots. The degradation was repeatable and
    only happened in certain spots. Is this because the signal bounces
    inside the casing and interferes with itself?
  2. Randy Day

    Randy Day Guest

    Possibly it came close to a nearby power main cable,
    possibly a cable TV drop (though not likely), or
    perhaps some large piece of metal was just getting
    between the xmitter and rcvr.
  3. kell

    kell Guest

    Maybe be pipe is acting as a waveguide, setting up standing waves...
    at certain spots, you get negative reinforcement.
    Several equidistant blank spots would lend support to this hypothesis.
  4. I agree. :)
  5. neon


    Oct 21, 2006
    I imagen the ipe is made of steel in that case positioning will make standing wave kill the signal all together. ROTORULER make a camera go down into pipes 500 meters but it is controlled and the F/B is with wires not an antennas. the camera is under pressure because of the enviroment.
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