Yet another SWR issue with a Cobra 29 LX

Discussion in 'CB Radio Forum' started by jiberjiber, Apr 8, 2018.

  1. jiberjiber

    jiberjiber Bobtail Member

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    Apr 8, 2018
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    So I bought this radio about a week ago from my local Frys, drove an hour and a half to the closest CB shop, and bought some coax (18' to be precise), a Procomm 4.5ft quad-wrapped antenna, and a stake-hole mount at the recommendation of one of the shop workers.

    Two days ago I installed everything. The coax run is done cleanly with no kinks and no coils and the core has continuity from one end to the other. The mount is grounded and I have confirmed that multiple times. I calibrated the SWR as per the instruction manual and multiple sources online using the build-in meter. The antenna does have an adjustable tip, which I've fiddled with and gotten just about the lowest SWR I think I can get at about a 3.1...

    I'm definitely a newbie when it comes to CB and this is my first ever CB install so I'm probably missing a few things.

    I took a couple different videos of the readings I get along with me actually calibrating it.
    Video w/ calibration and readings (Poor quality)


    Video of readings


    Any and all help is greatly appreciated, I'd rather not go drive another 4 hours to go back to that CB shop.

    Also, it's all installed on a 2011 Ford F150 with the stake-hole mount placed in the stake-hole directly behind the cab on the driver's side.
     
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  3. Meteorgray

    Meteorgray Heavy Load Member

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    You might get better results by moving to a stake-hole farther back. The metal cab might be causing some reflection.

    Also, you might need to use a copper strap or two to make sure the truck bed is grounded to the frame for good RF results.
     
  4. nblogger26

    nblogger26 Bobtail Member

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    Looks like your antenna is grounded out either to the box or to close to the cab.
     
  5. Ridgeline

    Ridgeline Road Train Member

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    Read this very carefully.

    Stop what you are doing, don't do a thing with it.

    Find someone with an antenna analyzer who can properly set up the antenna for you.

    As I read in another thread, many of you are missing a couple important points,

    The antenna causes you to get out or not get out.

    The antenna is matched to the coax which has nothing to do with the radio.

    Any radio on the other end of the coax will not change the swr.
     
    mike5511 and Oxbow Thank this.
  6. wolverine11

    wolverine11 Road Train Member

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    When it shows S/RF you are in normal transmit mode and when you key the mic the the meter mives up on the RF scale, that is your carrier/ Deadkey that is normal, I dont see the SWR problem.
     
  7. wolverine11

    wolverine11 Road Train Member

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    From what I am seeing in your two videos everything looks normal and good with your setup, and after you key up and meter moves ( carrier) if you talk into the mic it should swing forward a bit. If you sometimes see the word "antenna warning" when you transmit , ignore it, its got to do with an internal setting adjustment, most the 29's do it. If your radio check is good and the swr check is good it should be good, however it may be a good idea to buy a seperate swr meter and not rely solely on the built in meter.
     
  8. wolverine11

    wolverine11 Road Train Member

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    Once again after viewing one more time , you are saying swr is high but you keying mic in S/RF mode, you cant check swr when in that mode, the meter is moving to the appropriate mark( that little line on the RF scale) when you key the mic in S/RF mode, that is your deadkey/ carrier and is completely normal, and your swr appears to be about a 1.2 which is very good.
     
  9. Razrburn

    Razrburn Bobtail Member

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    It looks as though your swr maybe ok, but your supposed to calibrate first before doing a swr check. On mine my Cal changes on ch 1 and 40 slightly. A bad swr stays high the whole time you transmitted like my old cobra 19 dx III, what size antenna, are you running
     
  10. jiberjiber

    jiberjiber Bobtail Member

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    Thanks everyone for your responses.
    I took another look and I believe those of you saying it’s good are right. I met up with a friend to test and we were chatting from maybe 5 miles on flat rural terrain.

    Heading to a more local CB shop later today when they open to have them check it too.
     
  11. wolverine11

    wolverine11 Road Train Member

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    May I ask the name of the cb shop you are going to, just curious.
     
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