CB antenna tuning?

Discussion in 'CB Radio Forum' started by 4x4jeepmanthing, Jul 11, 2018.

  1. 4x4jeepmanthing

    4x4jeepmanthing Bobtail Member

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    hey all, just finished with installing my antenna and took it back to the local shop to have it tuned. They trimmed it before it was ever installed which seemed weird, but i know little about this.

    I brought it back to tune and he plug a meter into the antenna.

    What im confused on is whether or not you can tune an antenna with out the use of the radio at all?

    are there meters that dont require keying the mic to test SWR?
     
  2. Tensleep440

    Tensleep440 Light Load Member

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    I can only assume he hooked up an antenna analyzer. You don’t need the radio with one.

    Trimming before even installing depends on the antenna, some are simply known to have a certain bit trimmed off.

    Did he tell you the readings? What kind of antenna is it?
     
  3. craig_sez

    craig_sez Road Train Member

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    Yes you can tune an ant w/o a radio..Usually the radios meter is crap but good enuf as a guideline only..
    You said he cut the whip before installing,well its a bit quicker to do so when you have a long whip just so it gets closer to specific tune without repeating the process 3-5 times..
    A lot more to antenna measures than just swr.....Lots here to go over..Take some time to study ant stuff as well cause believe me when you have a good ant set up it don't need big power to reach out..
    KØBG.COM
     
    Ougigoug and Tensleep440 Thank this.
  4. Meteorgray

    Meteorgray Medium Load Member

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    When I bought a Wilson 500 mag mount it came with a stinger that was 62.5 inches long, the same length as my Wilson 1000.

    I figured that Wilson put the too-long stinger with the 500 because it's easier than having two lengths of stingers in stock, and it is recommended the antenna be tuned before using anyway.

    Ultimately, I trimmed the 500's stinger down to around 56 inches by going through many incremental quarter-inch steps. If I were a pro installing them with lots of experience, I would have cut about five inches off the stinger before starting the quarter-inch-cut-and-test process because I would know about how long the antenna would wind-up being in order to be resonant.

    So yes, I can see a tech making a cut before testing in such a situation.
     
  5. 4x4jeepmanthing

    4x4jeepmanthing Bobtail Member

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    Aug 22, 2017
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    Ok, the radio does not have a built in swr meter, I'm not sure if that's what was thought as written above. Ide always read the radio is used to key the Mic while tunning, this was never done on mine.

    Do some meters do this on there own?
     
    Last edited: Jul 12, 2018
  6. jessejamesdallas

    jessejamesdallas Road Train Member

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    Yes, the President McKinley has a automatic SWR checking feature, all you have to do on that radio is go to the SWR feature on the radio and without even keying the Mic it will start transmitting a tone to let you know if the SWR Is set correctly...

    On radios where they used a Antenna Analyzer to set SWR on the antenna, the Analyzer will do the keying, so again there's no keying the Mic since the radio wasn't even used to start with.
     
  7. rabbiporkchop

    rabbiporkchop Road Train Member

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    Yes they do.
     
    mike5511 Thanks this.
  8. 4x4jeepmanthing

    4x4jeepmanthing Bobtail Member

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    well thats good to see, being a bit ignorant I wasnt sure if these folks were just blowing me off or if it was a lack of what I did not know ( which is clearly the case).

    thank you all for the clarity!
     
  9. jessejamesdallas

    jessejamesdallas Road Train Member

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    Still could be a shop ripping you off...Only way to be sure is to run out and buy yourself a SWR Meter and check for yourself...There's really nothing to checking SWR with a meter, and you can pick up SWR meters for under $20...You will also need a 3' jumper coax to hook it up, but usually places that sell the meter also sell the jumper coax cable.

    Here's one with the 3' jumper coax, and Free shipping on Amazon for $28.
    https://www.amazon.com/METER-Radio-Antennas-Jumper-cable/dp/B002KRME3C
     
  10. slim6596

    slim6596 Medium Load Member

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    It doesn’t need to be 3’.
     
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