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Microwave oven

Discussion in 'Electronic Repair' started by Richard G. Gould, Oct 19, 2008.

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  1. It appears that our microwave oven has lost cooking/heating power over the
    years. Is that possible: Can the magnetron put out less power as it ages?
    How can one test the heating power of a microwave oven: Perhaps by heating
    a known quantity of water to a desired rise in temperature over a prescribed
    time period? Are there any such measures for a microwave oven of a known
    original/rated power?

    Rick
     
  2. Franc Zabkar

    Franc Zabkar Guest

    Notes on the Troubleshooting and Repair of Microwave Ovens

    7.1) Testing the oven - the water heating test:
    http://www.repairfaq.org/REPAIR/F_micfaq4.html#MICFAQ_017

    - Franc Zabkar
     
  3. GregS

    GregS Guest


    I suppose they still use Klystrons as deep space power amplifiers such as in Apollo missions.
    I think the standard power was 20 KW and made by Collins. A Hydrogen Maser
    was also used as a low noise amplifier and was used as the primary frequency
    standard, Cesium second. I just updated my learning from the web. A Cesium
    standard is basically a Xtal oscillator buffered with a atomic feedback loop and
    has poor short term stability. The Maser has the best short term stability and porr long term.

    greg
     
  4. GregS

    GregS Guest

    Well the moon was a bit farther away. I don't remember what things
    were tracked by the maser. Maybe it was just a backup, but easily overloaded
    on strong signals. All the 3 main 85 foot MSFN/STDN stations had masers.
    After Apollo, ERTS or Landsat was the main preoccupation. Tracking the
    Alsep packages on the moon was also done for a VLBI experiment.
    After that the stations were also recording Helios orbiting the Sun, a
    very week signal. You really had to play with it to get phase lock.

    Here is a link to the NASA bible for the stations. Its a big file....
    http://zekfrivolous.com/nasa/NASA-SP-87.pdf

    greg
     
  5. Arfa Daily

    Arfa Daily Guest

    The waveguide on the output of the mag (and it is a mag - ignore what
    clodhopper says below about it being a klystron) can become coated with
    resolidified vapourised grease and clag from the food that's been cooked in
    it - especially if it is a combination type that has a conventional oven in
    it as well. This can result in substantially reduced microwave cooking
    efficiency.

    Arfa
     
  6. Turbo_Boss

    Turbo_Boss

    2
    0
    Oct 24, 2008
    Check this web site:


    .repairfaq.org/sam/micfaq.htm
     
  7. Baron

    Baron Guest

    Yes they do loose power over time ! It depends upon how fast the
    filament/cathode looses the ability to produce electrons. Often
    Thoriated Tungsten is used in the heater ! If it gets hammered it
    rapidly looses emission.
     
  8. neon

    neon

    1,325
    0
    Oct 21, 2006
    FANTASTIC YOU TELL ME THIS AFTER I SPEND MONEY FOR A CESIUM ATOMIC CYNCH WATCH. Stupid thing misses a second every 20 millions years. wasted my money again.
     
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