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Author Topic: Looking to replace a mag mount 2m/70cm antenna with an NMO setup  (Read 3132 times)
GREGWTH7MMMAG
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Posts: 30




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« on: February 26, 2012, 12:29:36 PM »

Right now I am running a Diamond mr77 antenna on a 2m mobile in my Jeep Liberty.  I am planning to migrate to a permanent setup, in the roof, and am seeking guidence.  My plans are to install an NMO mount thru the roof, with a dualband antenna for hitting repeaters in the Colorado area.  Is there a preferred brand or type of mount to use, from Larsen, Diamond, Comet, etc?  Wanting to keep the antenna under 20" for normal use, as I park in a carport.  Any tips or suggestions would be great!
73s
KD0PWN
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KD0PWN
M6GOM
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Posts: 1014




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« Reply #1 on: February 26, 2012, 02:27:49 PM »

Larsen or Motorola in the USA. They seem to be as rare as hens teeth over here in Blighty.
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N6AJR
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« Reply #2 on: February 26, 2012, 02:35:50 PM »

I have 4 mounts , all Larsen in the roof of my pickup.  get a NMO mount with a gasket to seal to the roof.  I reccommend using a greenlee punch to make the 3/4 inch hole . I used a  diamond NR72BNMO antenna  for my 2m/440 antenna on the roof, Its under $50 and is only 12 or 14 inches tall   with about 2,15 dbi gain which it about normal for a 1/4  dual band vert.  I like Larsen mounts for nmo, and never had a problem with them ( knock wood) . you will notice better performance with a roof mount. mag mounts leave a bit of gain  due to lack of solid ground plane.
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K3GM
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« Reply #3 on: February 26, 2012, 03:05:46 PM »

I also recommend the use of a .750" Greenlee CHASSIS punch. I'd use only genuine Larsen NMO mounts.  They can purchased thru the big retailers online.  For the antenna, I again believe there is only one brand, Larsen. Their NMO-2/70 will last you just about a lifetime.
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GREGWTH7MMMAG
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Posts: 30




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« Reply #4 on: February 26, 2012, 05:15:03 PM »

I was on hamcity, and they have a Larsen NMO-K mount, thats what I'm looking for I think.  I dont see anything about a gasket though.
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KD0PWN
KJ4OBR
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Posts: 104




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« Reply #5 on: February 27, 2012, 10:08:29 AM »


The gasket is a rubber O-ring that lives in a groove under the outer threaded collar. Just be sure that the gasket is in place as you tighten the mount and you'll be fine.

+1 on the Greenlee punch for the hole.. those things are amazing. I used one to punch a hole into 16g stainless stock for a custom hood mount. it required one of my bigger wrenches, but the hole was clean. I do recommend a bit of 3 in 1 oil to help with the cutting.

73
Dave

I was on hamcity, and they have a Larsen NMO-K mount, thats what I'm looking for I think.  I dont see anything about a gasket though.
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KD8RFT
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« Reply #6 on: February 27, 2012, 06:37:16 PM »

Another vote for the larsen 270 nmo. Love mine.
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GREGWTH7MMMAG
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Posts: 30




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« Reply #7 on: February 27, 2012, 08:06:40 PM »

Looks like the Larsen NMO 2/70SH is the only one in their dual band line thats short enough.  Any of you guys run it with good results?
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KD0PWN
K3GM
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Posts: 1826




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« Reply #8 on: February 28, 2012, 04:49:55 AM »

I run 10m, 6m, 2m/70cm in the roof of my Tahoe; all Larsen.  The 2/70 is 25 years old. It's been installed on 5 different vehicles. Never a leak, never a problem.
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VA3WXM
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Posts: 277




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« Reply #9 on: February 28, 2012, 09:39:35 AM »

Looks like the Larsen NMO 2/70SH is the only one in their dual band line thats short enough.  Any of you guys run it with good results?
I have one but am not impressed.  From what I can gather, electrically it's 1/4 wave on 2m and 3/4 wave on 70cm.  It's not too bad on VHF but worse than a plain 1/4 wave on UHF.
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