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Thread: Antenna tuner and swr/wattmeter in series

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  1. #1
    Join Date
    Oct 2010
    Location
    Ponce, PR
    Posts
    117

    Question Antenna tuner and swr/wattmeter in series

    Hello guys I just have a quick question about what is the proper way to connect my antenna tuner and a swr/power meter in series so I can make everything work properly, 73's

  2. #2

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    Quote Originally Posted by WP4OGH View Post
    Hello guys I just have a quick question about what is the proper way to connect my antenna tuner and a swr/power meter in series so I can make everything work properly, 73's
    RIG -> WATT/SWR METER -> ANTENNA TUNER -> ANTENNA

  3. #3
    Join Date
    Oct 2010
    Location
    Ponce, PR
    Posts
    117

    Default

    Thank you everything is working great

  4. #4
    Join Date
    Jan 2007
    Location
    République de Banana
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    1,053

    Default

    Your homework assignment is to explain WHY they must be in that order...

    Seriously... This is a great learning opportunity.
    Sebenny Trees

  5. #5

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    Quote Originally Posted by WB2WIK View Post
    RIG -> WATT/SWR METER -> ANTENNA TUNER -> ANTENNA
    A lot of antenna tuners have built in SWR meters and that is how they do it. If someone doesn't know the answers to the following questions, he will learn something important by figuring out the answers.

    RIG -> SWR1 METER -> ANTENNA TUNER -> SWR2 METER -> coax -> ANTENNA

    What does the SWR1 reading tell us? What does the SWR2 reading tell us? What if we replace the 50 ohm coax with 450 ohm ladder-line?
    73, Cecil, www.w5dxp.com
    Can CO2 emissions save us from the coming ice age?

  6. #6

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    I have been wondering about this actually.

    What if it goes: TX -> METER -> TUNER/METER -> ANTENNA

    I have this setup (the first meter is more sensitive than the second) and occasionally the results differ. USUALLY they are in sync, one goes down the other goes down, but sometimes they act in see-saw fashion! You can't make one go down w/o raising the other one.

    Is this because one meter is riding on a "trough" and the other is riding on a "peak" of the standing wave? Or is this another way of saying I have a "magic length" coax that is just the right size to invert the wave?

  7. #7

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    Quote Originally Posted by VA3CQC View Post
    TX -> METER -> TUNER/METER -> ANTENNA
    What is more likely is the following (assuming that the above "TUNER/METER" is an average metered tuner):

    TX -> METER -> METER/TUNER -> ANTENNA

    The meters ideally should read the same but SWR meters and system conditions are rarely ideal.

    In a system with reflections, the SWR between the TX and METER will be different from the SWR between the TUNER and ANTENNA.
    73, Cecil, www.w5dxp.com
    Can CO2 emissions save us from the coming ice age?

  8. #8

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    Quote Originally Posted by VA3CQC View Post
    I have been wondering about this actually.

    What if it goes: TX -> METER -> TUNER/METER -> ANTENNA
    The SWR bridge/meter in an antenna tuner is always on the "transmitter" side of the tuner, and not on the "antenna" side; otherwise, no adjustment you make will show an SWR change on the meter.

    That they don't agree is pretty common; in such a case, the meter closest to the transmitter is the one you want to null.

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