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25 mW video TX - much higher mW output

Discussion in 'FPV (First Person View)' started by The Phantom, Aug 18, 2016.

  1. The Phantom

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    I tested a Walkera TX5811 Video transmitter that suppose to be 25 mW with a second hand bought ImmersionRC power meter and the power output showed about 71 mW and varied a bit between different channels.

    So is it common for Video transmitters to have a much higher power output than advertised, even the products from a well known manufacturer as Walkera? Or can it be that my power meter is malfunctioning and showing the wrong value?
    I asked this question in another forum as well to have a higher chance of getting an answer.
    I would appreciate some input and answers, thanks in advance.
     
  2. Mark The Droner

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    Did you test it outside in the open? Somebody posted recently that the cheaper meters will add power to the reading from other sources.
     
  3. The Phantom

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    I tested it inside near my computer, TV and mobile phone, and in the same room as my WiFi network, i will have to redo the test and post new results.
    But i have a feeling it will be about the same power output, but who knows?
     
  4. Mark The Droner

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  5. The Phantom

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    The link does not show any price, but i suspect its much more expensive than the 85 USD i paid for a second hand ImmersionRC power meter?
    But one would think that even the power meter from ImmersionRC should be pretty accurate, even though its not a 10.000 USD network analyzer? I thought ImmersionRC is a reputable company?
     
  6. IBV

    IBV

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    The RigExpert is much better. SWR measurement included.
    If you measure anywhere near Wifi sources your measurements will be totally off track!