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Thread: Using The ImmersionRC Power Meter To Measure SWR.

  1. #21
    Navigator jacq's Avatar
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    Better to read this... http://fpvlab.com/forums/showthread....project/page94


    Its not the purpose of this meter solely to "fine" tune (read SWR measuring) an antenna. You need an related coupler...
    In basic with only this power meter..., only by comparisation of more than one of the same antenna and check which one is best for that channel. (field measuring)
    Last edited by jacq; 27th January 2014 at 05:17 PM.

  2. #22
    Instructor Pilot Channel 1's Avatar
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    Quote Originally Posted by BasTijs View Post
    It looks like you can only select 5800...how do you tune the antenna to a certain channel between 5700-5900?
    Once you have your antenna in the ball park and using your vTX as a signal source set to the channel you want the antenna optimized for, use the ImmersionRC power meter as a SWR meter to tweak the antenna for the lowest possible "reflected" power measurement.

    Wayne
    Last edited by Channel 1; 27th January 2014 at 05:34 PM.

  3. #23
    Just fly and have fun rotary65's Avatar
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    Using The ImmersionRC Power Meter To Measure SWR.

    I tested most of my 5.8 antenna today using this method and was surprised by the results:

    3.482 Circular Wireless 4-lobe
    2.215 Bluebeam Mad Mushroom
    2.097 TrueRC Horizon
    1.666 Bluebeam SPW 4-lobe
    1.567 IRC 4-lobe Spironet
    1.368 IRC 3-lobe Spironet
    1.367 TrueRC Crosshair 1
    1.312 Fatshark whip
    1.248 TrueRC Crosshair 2

    Granted, these are all fairly well used, and some have been crashed. Also, my technique may not be spot on.

    There's nothing particularly wrong with these antennae; I'm just a little surprised at their relative ranking.

    Actually, the Circular Wireless one does concern me a bit as at 3.482 it is reflecting about 30%. The TrueRC Horizon at 2.097 is reflecting about 11%.

    Updated: Added a couple to the list. Look at those TrueRC Crosshairs! That's some very impressive accuracy at that scale. Hugo is quite a craftsman. I love being able to measure my FPV components!
    Last edited by rotary65; 10th February 2014 at 01:18 PM.

  4. #24
    Navigator soto48's Avatar
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    Interesting, I couldn't find the ZADC-10-63-S+ on ebay, there are other model but I am not too sure, please share the link to purchase the coupler, Thanks

  5. #25
    Just fly and have fun rotary65's Avatar
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  6. #26
    Navigator soto48's Avatar
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    Thanks Rotary, I just realize we can order direct from them.

  7. #27
    Instructor Pilot
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    Hey man would you be able to test my UHF stuff? Maybe check out the FC factory

  8. #28
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    Thanks to the author of the theme for the idea!
    Bought a directional coupler. Measured by the two antennas, the antenna of the transmitter and V-antenna.

    SWR coaxial dipole is the best 5-channel=1.8599646983354203
    SWR V-antenna is the best 8-channel=1.4502822234839845

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    Last edited by Dimmitri; 4th April 2014 at 05:46 AM.

  9. #29
    I want to measure my UHF (433MHz) antennas and maybe some other stuff down to 35MHz and up to 1.3GHz.

    Would this coupler be o.k. for this purpose? Other suggestions?
    http://www.minicircuits.com/pdfs/ZFDC-10-182+.pdf

  10. #30
    Quote Originally Posted by Channel 1 View Post
    Once you have your antenna in the ball park and using your vTX as a signal source set to the channel you want the antenna optimized for, use the ImmersionRC power meter as a SWR meter to tweak the antenna for the lowest possible "reflected" power measurement.

    Wayne
    You tune an antenna by changing the length of the antenna, so with like cloverleafs and such, you cant do this (well you could cut the "leafs" and go shorter, but going longer is not really feasible) , so you pick the frequency with the closest SWR match. If you build your own you can work at it until you get the ideal SWR for the frequency your shooting for.
    Last edited by _Milo_; 7th September 2014 at 03:50 PM.

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