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Thread: Using The ImmersionRC Power Meter To Measure SWR.

  1. #11
    Instructor Pilot Channel 1's Avatar
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    No clue, the only info on it is a led pattern for frequency selection and what might be a model number of DM58, I picked up a couple of them at Dayton thery where offered as 5.8 GHz security video transmitters for $15 each.

    All the instructions showed was the pinout voltage rating and power out which I think was 29 dBm.

    Wayne

  2. #12
    Just fly and have fun rotary65's Avatar
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    Thanks for the great step-by-step guide!

  3. #13
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    What would be good directional couplers to buy if I would want to measure 433 and 2.4?

  4. #14
    MrTakeNoPrisoners PeteDee's Avatar
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    Quote Originally Posted by swillhide View Post
    Not sure where you got the value of the coupler. The manufacture lists it up to 6 girlyhurtz but only down to 2.4

    http://www.minicircuits.com/pdfs/ZADC-10-63+.pdf
    Damn, my search bumped to the -17 DOH!
    similis vobis fugere eam furatus!

    • Edith Sitwell "I am patient with stupidity but not with those who are proud of it."

  5. #15
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    Quote Originally Posted by rwijnhov View Post
    What would be good directional couplers to buy if I would want to measure 433 and 2.4?
    That I cannot advise.

    Wayne

  6. #16
    Navigator Martin7182's Avatar
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    Wayne,

    You better put the attenuator between vtx and coupler. That way you protect the vtx against bad VSWR's.

    Just a thought,
    Martin

  7. #17
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    Quote Originally Posted by Martin7182 View Post
    You better put the attenuator between vtx and coupler. That way you protect the vtx against bad VSWR's.

    Just a thought,
    Martin
    Intresting idea, I have to try that out.

    Thanks

    Wayne

  8. #18
    KB3WHA kenkos68's Avatar
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    I have this coupler, Krytar 150816. According to the spec sheet, I should add 16db for a total of 46 db on the power meter. I also have a good 20 db attenuator. Using that instead of the 30 db gives me 36 db. Which one would be better to use? The 30 db or 20 db attenuator? Both are sufficient for the power levels that will be tested.

    Ken

  9. #19
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    Quote Originally Posted by kenkos68 View Post
    I have this coupler, Krytar 150816. According to the spec sheet, I should add 16db for a total of 46 db on the power meter. I also have a good 20 db attenuator. Using that instead of the 30 db gives me 36 db. Which one would be better to use? The 30 db or 20 db attenuator? Both are sufficient for the power levels that will be tested.

    Ken
    I would go with the higher one first, just to be safe.

    Wayne

  10. #20
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    It looks like you can only select 5800...how do you tune the antenna to a certain channel between 5700-5900?

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