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Author Topic: Changing a UHF hole to an NMO hole  (Read 510 times)
WV1K
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« on: May 20, 2009, 01:57:54 PM »

I have an NMO mount on my car and a UHF mount. Both were hit by a piece of insulating foam that flew off a car on the highway. It shattered both antennas and bent at least one mount back, the UHF mount, and destroyed the NMO too.

Is there a way while this is being fixed, to switch the UHF to an NMO ? If I did my research properly the UHF is smaller than the NMO hole.

I'm wondering if anyone reading this has done this.

Thanks
Matt
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K3GM
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« Reply #1 on: May 20, 2009, 03:31:32 PM »

Matt, perhaps plugging the hole with an insert and punching (note "punching") a new one would be the easier thing to do.  You could try this, again with a Greenlee chassis punch provided you could get to the underside of the hole. RTV a small temporary piece of sheet metal over the hole on the underside of the sheetmetal.  Then drill the hole for the punch's screw dead center on the backing sheet metal, and tighten up the punch as you normally would.  The scrape the temporary sheet metal piece off the underside.  With the hole sizes so close, I don't know if you can do it without the backing sheet metal.  You certainly can't do it with a hole saw.  A punch gives a precise 3/4" hole without any scratches or walking.
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K3NOQ
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« Reply #2 on: May 22, 2009, 07:30:41 PM »

I suggest you try enlarging the existing UHF hole with a Unibit which you can buy at most hardware stores ( or borrow one from a electrician). the unibit will have an increasingly graduated sized hole cutter thread, from small to larger.

 Your NMO mount should have a 3/4" hole.  Regardless of the hole you have now, the unibit will fit into the hole, Just be careful as the unibit will cut fast in sheetmetal and you don't want to oversize the hole!
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WV1K
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« Reply #3 on: May 23, 2009, 07:56:44 PM »

Thanks for the ideas, guys. I appreciate it.

Matt
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