digtal camera and cell phone in same pocket ok?

Discussion in 'Digital Cameras' started by jeffrey, May 20, 2005.

  1. jeffrey

    jeffrey Guest

    I had my pentax optio s5i in the same pocket as my cell phone. i got a
    call on the cell phone when the phone and camera were in the same
    pocket. next time i used the camera i got a memory error. I think the
    cell phone did something to the sd memory card.

    jeffrey, May 20, 2005
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  2. jeffrey

    jeffrey Guest

    yep, i got all the photos off it and reformatted it. did the cell phone
    couse the error?
    jeffrey, May 20, 2005
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  3. jeffrey

    JohnR66 Guest

    I don't know about when ringing, but when in use, cell phones emit RF
    energy. If this is strong enough to affect a memory card or camera, I'm not
    positive it could happen.
    JohnR66, May 20, 2005
  4. jeffrey

    Ron Hunter Guest

    Cell phones output various radio frequencies, at up to 1 watt. The old
    analog ones may output more than that. It is conceivable that a cell
    phone could cause a problem with a memory card. I can't put my cell
    phone closer to my monitor than 12 inches without getting lines on the
    monitor when the cell phone contacts the cell. Worse, I can't get it
    with two feet of my alarm clock as the thing causes the speaker to
    'rattle and pop' when it contacts the cell. It's loud enough to wake me up!

    Make me wonder if the guys with the aluminum beanies aren't onto something!
    Ron Hunter, May 21, 2005
  5. jeffrey

    Ron Hunter Guest

    Hard to say. Want to repeat the same situation for a test?
    Ron Hunter, May 21, 2005
  6. jeffrey

    Ron Hunter Guest

    Cell phones periodically emit RF even when not in use as they check in
    with the cell every so often, and when queried. If I set my cell phone
    (Motorola) near my monitor, it will generate lines on the screen a few
    seconds before it rings, and periodically when just standing by.
    Ron Hunter, May 21, 2005
  7. jeffrey

    jeffrey Guest

    im going to do that today. I did not format the card in the camera when
    i got it. i guesss that could of coused it to.
    jeffrey, May 21, 2005
  8. jeffrey

    Ron Hunter Guest

    Well, the most common cell phone frequencies these days are the same
    ones your microwave oven works on. It is possible they might warm up
    the equipment a bit, but hardly enough to do damage not that I would
    notice at MY age.. I have read that they warm the brain if you talk for
    a long time, but that just makes the brain work better...
    Ron Hunter, May 21, 2005
  9. jeffrey

    Paul H. Guest

    If I were you, I'd be far more worried about how many neurons I'm frying
    when using the cellphone than about the state of my camera's memory card.
    Paul H., May 24, 2005
  10. They're not really the same frequencies. Digital cellphones mostly
    operate at 1.9 GHz in North America, 1.8 GHz in Europe, while home
    microwave ovens are 2.45 GHz.

    But both of these frequencies can heat up human tissue if absorbed. The
    difference is in the power level, and the environment. Cellphone
    average transmit power is under 1 W for the handheld models, and most of
    that energy is radiated away from your body, not absorbed. Microwave
    ovens have an output power of 600-1000 W or more, and this is emitted
    into a closed metal-walled cavity. The microwaves can't get outside,
    and reflect from the walls repeatedly until they are absorbed by
    something, usually the food placed inside. The food ends up absorbing
    almost all the energy.

    So, don't put your head in a microwave oven while it's turned on!

    As for cellphones, you can minimize any effects of RF absorption by
    using a phone with a visble antenna sticking out, using a flip-style
    phone (which puts the antenna further from your head), and keeping your
    calls short.

    Dave Martindale, May 24, 2005
  11. jeffrey

    Ron Hunter Guest

    Sorry, but newer cell phones, cordless phones, and even 802.11g wireless
    computer communications all use those frequencies (2.4ghz).. I never
    meant to imply that cell phone use was going to cook your brain, but
    recent studies DO show some warming effects, minimal as they are. Given
    that I have seen people with cell phones head to their heads for 30
    minutes or more (while they drive down the freeway at 75mph), there is
    probably some danger inherent in this practice.
    Ron Hunter, May 24, 2005
  12. jeffrey

    ASAAR Guest

    I know they're not supposed to leak, but I know at least a couple
    of people that have interference problems from microwave ovens when
    they're using their 2.4GHz portable phones. My own phone uses
    900Mhz and works flawlessly. But I have a microwave oven too, so
    maybe I should also get one of those 2.4GHz leakage detecters? :)
    ASAAR, May 24, 2005
  13. jeffrey

    Ron Hunter Guest

    I used to test radar detectors with microwave ovens. A detector that
    was good for 1/2 mile detection of police radar usually reacted within 6
    inches of a microwave oven! And people worry about microwave oven
    Ron Hunter, May 25, 2005
  14. I'll have to disagree. Cordless phones, 802.11x wireless networking,
    and microwave ovens all use 2.45 GHz because it's a licence-free radio
    band, one of the ISM (industrial, scientific, and medical) bands.

    Cell phones do *not* operate at those frequencies because cellphones use
    licenced spectrum, protected from interference. The FCC (in the USA)
    auctioned off this spectrum for billions of dollars. In comparison, it
    costs nothing to use 2.45 GHz - but you're competing with cordless
    phones and microwave ovens.

    Dave Martindale, May 25, 2005
  15. The oven's aren't supposed to leak enough energy to be dangerous. That
    doesn't mean that the leakage is supposed to be low enough to avoid
    interfering with a much lower-powered cordless phone, particularly when
    the oven is closer to the phone than the base station.

    Apparently wireless networking at that frequency works reasonably well
    because microwave ovens are silent half the time. The high voltage
    supply uses a voltage doubler circuit, and the magnetron is forward
    biased (and thus generating microwaves) for only 1/120 second out of
    every 1/60 second line frequency cycle. So even with a nearby oven, the
    wireless gear can still get packets through in the 50% "silent" times.

    Dave Martindale, May 25, 2005
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