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Clean VHF/CB radio installs

Discussion in '3rd Gen. Tacomas (2016+)' started by FoleySwampPlotts, Feb 10, 2016.

  1. Nov 7, 2019 at 12:41 PM
    #1381
    vicali

    vicali Chilling at YMH

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    I wouldn't tuck them too close. I always had 1m stuck in my head but it's actually variable based on 1/4 wavelength of the antenna;

    The easy answer is that you should maintain a minimum mounting distance of at least 1/4 wavelength apart for the lowest frequency antenna within the same horizontal plane. For VHF antennas, that translates to roughly 19 inches.

    https://www.jpole-antenna.com/2013/07/28/how-close-can-i-mount-two-vhfuhf-antennas/
     
    MikeyD.25 likes this.
  2. Nov 7, 2019 at 8:00 PM
    #1382
    Cudgel

    Cudgel “Tonka”

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    Virtually no chance it matters, other than to the radio attached to the “radio” antenna when you transmit if they are only a few mm apart. The ham won’t care, it’s more important if it’s a ground plane dipole that it has a good center of mass location, and secondary that large vertical planes are not directly adjacent for the majority of height, as in an inch or two.
     
  3. Nov 8, 2019 at 8:29 AM
    #1383
    k8md

    k8md Well-Known Member

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    Wow, this is terrible advice. Having a 2m vertical a "few mm" from the broadcast antenna is going to cause a multitude of problems. 1. It's possible to couple enough energy from the 2m antenna into the broadcast antenna to damage the broadcast receiver. 2. The pattern of the 2m (TX & RX) is going to change significantly with the broadcast antenna in the nearfield.

    Ideally you want antennas at least 1/4 wavelength apart. More is better.
     
    vicali likes this.
  4. Nov 8, 2019 at 10:31 AM
    #1384
    Cudgel

    Cudgel “Tonka”

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    Ideally (theory) yes, but in practice on mobile 2m rig this is not often as important as if feels it should be. I’m completely aware of the endless design discussion this will ensue, so I will acquiesce to the theory and the jury shall disregard the comments from the defendant.

    I did imply he’d cook his music radio. But the radios in tacos suck so bad that’s another solution.
     
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  5. Nov 14, 2019 at 3:48 AM
    #1385
    disconnected

    disconnected LOST

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    Greg
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    It looks like relentless only makes the hood mount for the 1st and 2nd gen. I’ve got a Tonneau Cover. Trying to find ideas.
     
  6. Nov 14, 2019 at 6:35 AM
    #1386
    5nahalf

    5nahalf I build dumb things

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    Erik
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    You could get a rear mounted one like mine, I forget who makes it, but just search for tacoma cb mount

    [​IMG]
     
  7. Nov 14, 2019 at 6:39 AM
    #1387
    disconnected

    disconnected LOST

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    Sweet truck! I’ll do some more searching. I really like the upfront idea.
     
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  8. Nov 14, 2019 at 6:48 AM
    #1388
    LegendaryAcura88

    LegendaryAcura88 Well-Known Member

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    For what it's worth, I used a ditch light/antenna mount on the hood and I had a hell of a time getting the SWR levels to a reasonable level. I even used a transmission strap to ensure a solid ground between the hood mount and the frame (I am aware of the difference between electrical ground and the ground plane an antenna uses, but figured it couldn't hurt). In retrospect, I wish I would have mounted the antenna elsewhere.
    If you still wish to pursue that mounting location, I believe I went with Relentless Fabrications mount:
    https://www.relentlessfabrication.c...s/2016-tacoma-hood-hinge-ditch-light-brackets
     
    disconnected likes this.
  9. Nov 14, 2019 at 7:14 AM
    #1389
    5nahalf

    5nahalf I build dumb things

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    Do you have a metal front bumper? If so you could go Australian style and mount the antenna to the bumper.
     
    Gunshot-6A and disconnected like this.
  10. Nov 14, 2019 at 8:20 AM
    #1390
    vicali

    vicali Chilling at YMH

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    Most radio shops should have fender mounts available;

    [​IMG]

    Works for millions of work trucks - was fine for my old 2nd gen.
    I had it mounted on the 3rd gen the same but my ditch light blasted right into it.. so I moved it to the ditch bracket beside my light.



    SWR is fine;
    [​IMG]
     
  11. Nov 15, 2019 at 6:32 AM
    #1391
    k8md

    k8md Well-Known Member

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    It's fine for CB. 27 mhz at 5w doesn't scare me. Id never use one for VHF/UHF at 50w though. It violates FCC exposure limits.
     
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  12. Nov 15, 2019 at 10:10 AM
    #1392
    vicali

    vicali Chilling at YMH

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    Yep, I've done the math and read the arguments.
    I'm comfortable that mine stays at 5w, rx 99% of the time, I'm surrounded by local repeaters, don't ragchew, and avoid getting stuck in the grill of logging trucks..
     
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  13. Nov 15, 2019 at 4:06 PM
    #1393
    North Idaho Tacoma

    North Idaho Tacoma Member

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  14. Nov 15, 2019 at 4:15 PM
    #1394
    vicali

    vicali Chilling at YMH

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    North Idaho Tacoma likes this.
  15. Nov 15, 2019 at 4:17 PM
    #1395
    MikeyD.25

    MikeyD.25 Well-Known Member

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    You could look into one of these...it's a dual band glass mount antenna. I've used them on several vehicles without any problems. As long as there are no AM/FM broadcast antennas (wire type) inside the glass you're good to go.

    antenna.jpg
     
  16. Nov 15, 2019 at 5:35 PM
    #1396
    Drifter001

    Drifter001 Well-Known Member

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  17. Nov 15, 2019 at 6:02 PM
    #1397
    medic2230

    medic2230 @Koditten Pirate Radio member #002

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  18. Nov 15, 2019 at 7:12 PM
    #1398
    North Idaho Tacoma

    North Idaho Tacoma Member

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    Thanks for the info gentlemen. I will look tomorrow if it isn't snowing. I still use my XM radio, at least until the free is over.
     
  19. Nov 15, 2019 at 8:07 PM
    #1399
    RyanDCLB

    RyanDCLB Well-Known Member

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    Or drill a new hole?

    The FM is located in the shark fin too.

    I ended up buying a PL259 from my local electronics store to go through the firewall :notsure:.
     
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  20. Nov 15, 2019 at 8:56 PM
    #1400
    m603holden

    m603holden @Koditten Pirate Radio member #063

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    Lots of sail boat fuel
    Or just cut it and re solder it on. Would make it easier to get through.
     
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