Bug "sniffer"

Discussion in 'General Electronics Chat' started by richbrune, Feb 10, 2007.

  1. richbrune

    Thread Starter Senior Member

    Oct 28, 2005
    106
    0
    Does anyone know how I can convert a 310 Mhz garage door remote reciever into a "bug sniffer" so that I can locate which vehicle in the nearby parking lot has a stuck remote in it? The receiver that is included in the current receiver is a simple length of wire about 9 inches long or so, I think it must be 50 ohm. I'd like to know if I can adapt some kind of very directional antenna to it? Thanks again,
    Rich
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Try cutting a bean can in half lengthwise and using it as a reflector.
     
  3. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
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  4. richbrune

    Thread Starter Senior Member

    Oct 28, 2005
    106
    0
    Seems like I'd need a 38" diameter "bean can" but I don't know how to calculate the position of the antenna that's enclosed. :confused:
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Look into making a Yagi. The ARRL site should have instructions. Add extra directors for a norrower beam - translates to improved directivity.
     
  6. richbrune

    Thread Starter Senior Member

    Oct 28, 2005
    106
    0
    I made a Yagi antenna, out of a 2x4 8 feet long or so, with 9 directors, and took a similar 310 Mhz remote and jammed a toothpick in the button. I got a pretty strong, patchy response out of the front, an excellent "dead" area in the back, but I had a lot of strong reception from the sides. Is there a way to eliminate the reception from the sides?
     
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