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use microwave oven as high powered transmitter.

Discussion in 'Electronic Repair' started by [email protected], Mar 18, 2007.

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  1. Guest

    I was sitting around thinking the other day. (I sometimes do this when
    I have a few extra minutes), and it occurred to me that there is a
    very powerful source of RF energy sitting in most of our kitchens. Our
    microwave oven. Now theororetically speaking (of course), if the
    magnetron was properly connected to a waveguide and this energy was
    directed to a suitable parabolic antenna we would have a very high
    powered 2400 MHZ CW transmitter. To further the project, I don't
    believe there is a screen grid on a mag so if one was enterprising
    enough could plate modulation be added to this? I'm sure FCC approval
    would be no problem at all....
    Lenny Stein, Barlen Electronics.
     
  2. Bob Loblaw

    Bob Loblaw Guest

    McGyver Death-Ray I'm thinkin'....
     
  3. mike

    mike Guest

    It's already well modulated at 60 Hz. at least in these parts.
     
  4. JANA

    JANA Guest

    The magnetron would be a very crude type of emitter.

    In theory a high power microwave transmitter can be built with a magnetron.
    It would have to be properly tuned to the antenna. Being a crude magnetron,
    it would be very high on harmonics to begin with. I would doubt that this
    type of transmitter would have any approval by the FCC.

    Today's radar systems use very refined tubes such as a TWT or Klystron with
    proper tuning and control. There are new technology radar systems that are
    working with solid state high power devices rather than tubes. They work at
    a much lower base power than the magnetron from a microwave oven.

    As for pointing such a high power transmitter at anything, it would be
    lethal.

    A point of interest is that there is some research going on to be able to
    make a solid state microwave oven. Getting the high power levels required
    for food cooking using solid state devices at a reasonable cost, is what is
    being researched.


    --

    JANA
    _____


    I was sitting around thinking the other day. (I sometimes do this when
    I have a few extra minutes), and it occurred to me that there is a
    very powerful source of RF energy sitting in most of our kitchens. Our
    microwave oven. Now theororetically speaking (of course), if the
    magnetron was properly connected to a waveguide and this energy was
    directed to a suitable parabolic antenna we would have a very high
    powered 2400 MHZ CW transmitter. To further the project, I don't
    believe there is a screen grid on a mag so if one was enterprising
    enough could plate modulation be added to this? I'm sure FCC approval
    would be no problem at all....
    Lenny Stein, Barlen Electronics.
     
  5. Guest

    What possible use is this?


    NT
     
  6. Little information content. :)

    You would have to modify the power supply to produce HV DC and then
    modulate that.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  7. Bill Janssen

    Bill Janssen Guest

    Or filter the existing power supply to get DC and build a pulse
    generator to get short pulses at a high frequency (> 10 KHz) and FM
    modulate the pulse generator. :)

    Bill K7NOM
     
  8. The way they are designed, you can't simply tack on a filter capacitor.
    The existing parts could be rearranged into a half wave rectified and
    filter supply at perhaps 2 kV. To reach the 4 kV or so peak of the
    typical oven, would require another HV diode and HV cap. But it's a bit
    more hassle because the normal microwave oven has the HV transformer,
    HV capacitor, and magnetron with one side connected to the chssis.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  9. James Sweet

    James Sweet Guest


    The ones I've dealt with have two terminals on the capacitor, I don't
    recall seeing any polarizing markings. You're right about the
    transformer and magnetron though.
     
  10. Yeah, that has to be correct. Neither end of the cap is normally grounded.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  11. Andy Dingley

    Andy Dingley Guest

    It decodes to "The USA is the dominant technology state on this
    planet, compared to the 50Hz heretic perverts of Europe"
     

  12. It was done, about 20 years ago by a ham radio operator. There was
    an article published in one of the ham radio magazines about it.


    --
    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
     

  13. Its not their fault that their leaders can't get up to full speed.


    --
    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
     
  14. I think it's been done by hams, many years ago. With a tube in series
    with the HV to modulate the plate voltage.

    Unfortunately the magnetron isnt too stable, frequency-wise. So with
    varying plate voltage you get both AM and FM.

    And too wide a bandwidth for moon-bounce, I'd guess.
     
  15. Jack

    Jack Guest

    With an appropriately pointed dish you could update motorists speed on
    speed camera RADAR. Sounds good to me, besides making the camera
    operator go a little blind.
    The alternative is that you should cook the primary detection circuit
    on the device, cooking its goose so to say.
    Modulation could be a problem...
     
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