I'm having to replace the gaskets around my NMO mounts about every two years. Now I realize that's not bad, but there is one NMO antenna I have which has not started to crack or fall apart.
I believe that good one was off a an extra Maxrad NMO kit I had lying around but I have no way of finding out just the part # for the gasket. The gaskets I have that are cracked and falling apart are from Larsen believe it or not.
Does anyone have any suggestions on who makes some decent gaskets and what the part # might be? BTW, the gasket I'm talking about is a flat ring type gasket that sits around the outer edge of the NMO (not the o-ring under the NMO) and gets "sandwiched" in between the car body and the part which screws on when you attach the antenna.
Thanks.
Good NMO Gasket?
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- Motofanatic
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- Joined: Mon Sep 03, 2001 4:00 pm
Antenna Specialists
I've got a 3db UHF A/S ,with NMO mount, on my wagon that has been there
for 6 years now with no leakage at all!!
for 6 years now with no leakage at all!!
Pete
K2XM
Hudson, NH
K2XM
Hudson, NH
- FireCpt809
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- Joined: Sat Jan 19, 2002 4:00 pm
- What radios do you own?: Alot..
I know what you are talking about. We use them at the shop on all the squad cars. I dont have the Maxrad p/n in front of me. I know they come in a bag of about 10.
Monty is correct about the silicone grease( dielectric}. It works great to keep that thin rubber gasket in the brass ring. We add a dab just on the contact under the base. It seems to keep the moisture down and reduce the amount of RF loss.
Monty is correct about the silicone grease( dielectric}. It works great to keep that thin rubber gasket in the brass ring. We add a dab just on the contact under the base. It seems to keep the moisture down and reduce the amount of RF loss.
- FireCpt809
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- Joined: Sat Jan 19, 2002 4:00 pm
- What radios do you own?: Alot..
- Motofanatic
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- apco25
- Posts: 2685
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- What radios do you own?: APX / Astro 25 / Harris
Something I have noticed about the dieletric grease and silicone that comes with NMO mounts is that its often over used. I just used a tiny amount to seat the gasket in the locking ring. Otherwise I leave the rest of the threads bare. I've noticed the installs that use the grease just attract a lot more dirt leaving you with a gummed up, sticky and filthy mount with crud in all the threads.So on my personal vehicle I just take the antennas off after the car wash and dry each mount out. Also I replace my NMO mounts ever few years even though they don't need it.