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RF interference from 2 meter ham radio

Discussion in '3rd Gen. Tacomas (2016+)' started by Rujack, Jun 28, 2019.

  1. Jun 28, 2019 at 10:00 AM
    #1
    Rujack

    Rujack [OP] Stop Global Whining

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    I have an ftm 400xdr with the antenna mounted on a ditch light bracket on the passenger side hood hinge. When I beacon APRS, it interferes with my phone in that if there’s music or other audio playing from my phone, it will skip tracks, pause or similar.

    I’m thinking I could move the antenna to the roof, which may (or may or may not) help, but the current location of the antenna has been getting good results and is reasonably safe from branch strikes etc.

    I also would prefer not to move my phone.

    Any ideas on what I can do?
     
    Gunshot-6A likes this.
  2. Jun 28, 2019 at 10:14 AM
    #2
    dfanonymous

    dfanonymous Well-Known Member

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    I can’t help with the how to move it, but if you can run the antenna as far back it will help with reducing the interference. If you can get a donkey dick antenna or or a whip to make it high it will help with range.
     
  3. Jun 28, 2019 at 10:33 AM
    #3
    OnHartung'sRoad

    OnHartung'sRoad -So glad I didn't take the other...

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  4. Jun 28, 2019 at 10:34 AM
    #4
    Rujack

    Rujack [OP] Stop Global Whining

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    It’ll happen even when it’s not plugged in
     
  5. Jun 28, 2019 at 10:35 AM
    #5
    Rujack

    Rujack [OP] Stop Global Whining

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    Considering it, but not ready to yet. Not much real estate left on the roof or bed etc...
     
  6. Jun 28, 2019 at 10:37 AM
    #6
    nvnv

    nvnv Well-Known Member

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    There’s something wrong with your ham radio or your install. A 2 meter radio should not be interfering with your phone or sound system at all.

    How do you have your radio wired for power?

    I have pretty much the exact same setup as you. NMO antenna mount on a ditch light bracket passenger side. I have a Kenwood D710A that I also use with APRS. Absolutely no interference.
     
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  7. Jun 28, 2019 at 10:38 AM
    #7
    coopcooper

    coopcooper certified youtube mechanic

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    alberta canada
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    that cant be a real thing
     
  8. Jun 28, 2019 at 10:41 AM
    #8
    OnHartung'sRoad

    OnHartung'sRoad -So glad I didn't take the other...

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    Somewhere in the Mojave Desert...
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    At least it doesn’t mess with your cruise control, a friend with a linear on his CB (yeah, dumb) would key up and his truck would accelerate when on CC.

    Put a choke on the power cord for your radio, too? Also, have you checked the VSWR of your RF antenna? And how close is the XMTR to your phone and head unit?
     
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  9. Jun 28, 2019 at 10:45 AM
    #9
    Gunshot-6A

    Gunshot-6A Not a Fed

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    Thats the most round about way to get a hand throttle I've ever heard of! :rofl:
     
  10. Jun 28, 2019 at 10:48 AM
    #10
    Gunshot-6A

    Gunshot-6A Not a Fed

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    Its a nickname for the stub antennas. Bout 3-6 inches long depending on what band you're using. They have a cousin called the cowpie or the hockey puck as well. Next time you see an unmarked PD cruiser, look on the trunk. They are pretty common on LEO vehicles since their operating freqs are fixed. Donkey dicks and hockey puck antennas suck ass at operating across a whole band.


    [​IMG]
     
    SC4333 and coopcooper like this.
  11. Jun 28, 2019 at 10:49 AM
    #11
    Dravnx

    Dravnx Well-Known Member

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    Braided ground strap to hood from bracket. Braided ground strap from hood to body of truck. Cures a lot of interference problems.
     
  12. Jun 28, 2019 at 10:52 AM
    #12
    OnHartung'sRoad

    OnHartung'sRoad -So glad I didn't take the other...

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    Yeah, if his antenna is not balanced, or he crushed his coax he could blow his final in addition to possibly getting interference elsewhere.
     
  13. Jun 28, 2019 at 10:54 AM
    #13
    OnHartung'sRoad

    OnHartung'sRoad -So glad I didn't take the other...

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    This^^^
     
  14. Jun 28, 2019 at 11:06 AM
    #14
    andrewbrandon19

    andrewbrandon19 Well-Known Member

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    Not antenna related, but a cherished army memory was watching the face of a squeaky new, very sheltered/religious, female PFC when she was told by the female SFC to go to supply, get a donkey dick, and bring it to the motor pool because "I need one right now so be quick about it".

    [​IMG]
     
  15. Jun 28, 2019 at 11:39 AM
    #15
    Rujack

    Rujack [OP] Stop Global Whining

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    This guy?

    https://youtu.be/q_INBH_b19o

    SWR is around 1.2:1 at 144.000
     
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  16. Jun 28, 2019 at 11:44 AM
    #16
    Rujack

    Rujack [OP] Stop Global Whining

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    Radio is wired to auxiliary blue sea fuse box with, iirc, 12 awg wire with negative going to buss in the box which is mounted about 1’ from battery.
     
  17. Jun 28, 2019 at 11:45 AM
    #17
    Rujack

    Rujack [OP] Stop Global Whining

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    Coax should be ok. Not pinched anywhere and routed through firewall.
     
  18. Jun 28, 2019 at 11:45 AM
    #18
    Rujack

    Rujack [OP] Stop Global Whining

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    I’ll try that. I’ve been meaning to do some bonding anyway and have the braided strap here.
     
  19. Jun 28, 2019 at 12:01 PM
    #19
    nvnv

    nvnv Well-Known Member

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    This could be an issue. Did you run coax and power through the same hole as the main wire harness that goes through the firewall? I ended up running my ham power and coax through a grommet under the driver’s seat. This keeps it separated from all the other wiring in the truck.
     
  20. Jun 28, 2019 at 12:05 PM
    #20
    OnHartung'sRoad

    OnHartung'sRoad -So glad I didn't take the other...

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    Yup, it’s OK to run cords across each other at a right angle but not parallel.
     
    Dravnx likes this.

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