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How would I go about making this CB mount for my Prinsu?

Discussion in 'Technical Chat' started by Denon123, Apr 4, 2021.

  1. Apr 4, 2021 at 7:19 PM
    #1
    Denon123

    Denon123 [OP] New Member

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    I saw another person post about this in another forum, but they haven't been on since 2018. Looking to see how I can replicate this to mount a CB/HAM antenna onto my prinsu rack, but I don't know where to start. Not super "crafty" yet, just recently started to become "crafty" (if that's the word for it) when I started to install mods for my truck. Any help is appreciated[​IMG]
     
    Elphane likes this.
  2. Apr 6, 2021 at 6:33 PM
    #2
    HisDad

    HisDad Well-Known Member

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    It's hard to say without knowing the exact size, but it looks like a square electrical box cover that was drilled out.
     
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  3. Apr 6, 2021 at 6:38 PM
    #3
    ksimms92

    ksimms92 Well-Known Member

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    That looks like a NMO mount that was put into this plate instead of drilling through the roof. Not sure on the dimensions but you’d essentially need a sheet of metal (probably aluminum from any hardware store) and then just measure where the holes need to be.
     
  4. Apr 7, 2021 at 8:09 AM
    #4
    HisDad

    HisDad Well-Known Member

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    If that's an NMO or similar mount, than a 2 gang cover plate would be about the right size. As to mounting to the rack, a "T nut" looks like it would work.

    We really need some measurements to give more accurate advice.
     
  5. Apr 8, 2021 at 7:08 PM
    #5
    Denon123

    Denon123 [OP] New Member

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    I appreciate everything you're sharing. Im just having trouble trying to find a way to imitate the NMO, most of the ones I can find are all exposed metal of some sort l.E. https://www.talleycom.com/viewProduct?rlProdNum=LARNMOKHFDSTHK
     
  6. Apr 9, 2021 at 4:34 AM
    #6
    HisDad

    HisDad Well-Known Member

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  7. Apr 9, 2021 at 4:50 AM
    #7
    pdaddy

    pdaddy WeLl-KnOwN mEmBeR

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    Small carriage bolts also fit in the slots. It’s what I used for my traction boards
     
  8. Apr 9, 2021 at 5:04 AM
    #8
    GarlicFarts

    GarlicFarts Bang Ding Ow

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    Your roof rack is made from what's called extruded aluminum, 80/20 aluminum, T-slot aluminum, etc. It has a lot of names.

    Anyway, that's a very generic material - used in a lot of applications, structural, storage, 3D printers, etc.

    Check out all the cool shit you can get for them here:
    https://www.mcmaster.com/aluminum-extrusion-fittings/

    You'll want T Nuts, and bolts that go into them. And washers.

    As far as the plate itself - looks like any random sheet stock, I'd recommend repurposing an electrical box cover, as the edges will be deburred already and won't (be as likely to) cut you open while you work on it.

    Otherwise - CB mount can be anything.

    upload_2021-4-9_7-58-42.jpg

    This is your typical CB mount - the plate mounts to somewhere (is grounded), and the antenna screws into that fitting. The fitting is isolated on the top via a plastic washer, so it won't contact the aluminum/steel bracket. This is the setup I had - using a Cali Raised LED tailgate mount, I really liked that setup. Antenna screws into the top (I recommend a spring as well, if you're using a firestik like I did). Antenna cable screws into the bottom and then routes to the radio.

    So for a plate - drill through with the hole size needed for that plastic isolator washer and you're good to go from there.

    NMO is a different type of mount, gets you the same place though (for all intents and purposes, for a Tacoma).

    upload_2021-4-9_8-1-25.jpg

    I vaguely know a little about them, but not much. But same deal - drill a hole through that plate, and put the antenna base on it, and then screw the antenna onto the base, badda bing all done!

    Routing the antenna cable is a b@#$*. If I ever do another CB setup I'll be using a glass mount on the rear glass. Eliminates 90% of the work.
    https://www.buytwowayradios.com/mid...I85Zn0_MexVjE8y9EJxNoQgHzW6WlwXxoClBoQAvD_BwE
     
    0xDEADBEEF likes this.
  9. Apr 9, 2021 at 6:11 AM
    #9
    HisDad

    HisDad Well-Known Member

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    OP, are you using this for CB or Ham? IOW, what frequency range do you want an antenna for? That can tell us a lot about what type of antenna will work for you. As @GarlicFarts points out, CB antennas are not typically mounted on NMO mounts.

    I strongly advise against using glass mount antennas for CB frequencies. Performance will be marginal at best. Window mount antennas were originally designed for cell phones back when cell phones were mostly installed in vehicles and put out 3 wats of power. They worked fine for 800Mhz frequencies, but the lower in frequency you go, the less efficient they are.
     
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  10. Apr 9, 2021 at 6:14 AM
    #10
    GarlicFarts

    GarlicFarts Bang Ding Ow

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    Yup - my application is basically non-existent, which is actually why I bailed on it and pulled my system down. Everyone I go wheeling with uses VHF/UHF nowadays, and on road trips it was all truckers yelling at each other at merge points/lane closures, and asking about the nearest rest stop. Go-arounds matter with a 53' trailer or doubles, but in a Tacoma I can just follow Google without questioning it :notsure:
     
  11. Apr 9, 2021 at 6:38 AM
    #11
    maineah

    maineah Well-Known Member

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    CB is 5 watts. If you mount it on a roof it's going to get damaged and more then likely your rack will be too. CB antennas to have any gain are going to be tall like 8 1/2 feet just for a 1/4 wave, even a wound CB antenna is going to be tall. Inside of a CB short antenna is the same amount of wire that a full size 1/4 wave would be just wrapped around a core. Small CB antennas basically don't work worth a damn. Can't begin to tell you how many antennas I have seen ripped out of truck roofs.
     
  12. Apr 9, 2021 at 6:46 AM
    #12
    maineah

    maineah Well-Known Member

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    Other than FMRS ever other band is licensed except CB basically it was so out of control the FCC just gave up. GMRS is a no test band but you still have to register. Hams are real sensitive about their bands and they will report non licensed transmissions to the FCC (big brother does listen) so don't even go there.
     
  13. Apr 9, 2021 at 6:58 AM
    #13
    GarlicFarts

    GarlicFarts Bang Ding Ow

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    Yup. Foxhunting, if they find out who it is they'll report you. FRS is no license, GMRS uses the same frequencies but with more power (on some, others I think channel 8 thru 14 they're both at 0.5 W limits), and can use repeaters. Fee for 10 years license, no test. Ham was free, soon to be fee for license, lifetime. CB is citizen band - no license required, radios I THINK need to be type cert by FCC though, similar to FRS and GMRS radios.

    FRS and GMRS have access to the same bands and channels, it's just that GMRS can have more power behind it than FRS.

    https://www.buytwowayradios.com/twr-fgrqrc.html

    upload_2021-4-9_9-58-23.jpg
     
  14. Apr 9, 2021 at 6:59 AM
    #14
    0xDEADBEEF

    0xDEADBEEF Greasy Member

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    Rust, dents, miles, extra metal.
    Note that if you have an antenna in the middle of your rack, it might make putting things on the rack frustrating, so you might look at a side mount.

    That said, which radio band do you want? That'll tell you a lot about what gear to use.
     
  15. Apr 9, 2021 at 8:57 AM
    #15
    Denon123

    Denon123 [OP] New Member

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    I’m gonna be using it for CB as of now, my buddies I go off roading with use CB. I used an extra mag mount that one of them had, but I don’t trust it against the paint. It doesn’t need to be super powerful, the one they gave me had a 3 or 4 ft antenna and it worked fine
     
  16. Apr 9, 2021 at 9:00 AM
    #16
    Denon123

    Denon123 [OP] New Member

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    Thanks to Reddit, I discovered it’s a Wilson 1000/5000 roof mount assembly with the weather cap over it
     
  17. Apr 9, 2021 at 2:45 PM
    #17
    maineah

    maineah Well-Known Member

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    Big brother does monitor GMRS and FMRS frequencies. Do not relay on these freqs in a life threatening situation GMRS maybe because repeaters are allowed.
     
  18. Apr 9, 2021 at 3:02 PM
    #18
    Mark77

    Mark77 Well-Known Member

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    Nothing yet
    Man card revoked for one month. You aren't crafty, you're FABRICATING.
     
  19. Apr 9, 2021 at 3:12 PM
    #19
    Gunshot-6A

    Gunshot-6A Not A Fed

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    NMO mount, drill a few holes in a flat plate, 1/4x20 hardware. job done.

    20171210_165820.jpg
     
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  20. Apr 9, 2021 at 5:12 PM
    #20
    HisDad

    HisDad Well-Known Member

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    That's a really tall antenna to mount on the roof of a truck.
     

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