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Author Topic:   GAM SS2 VHF Assembly
davej14 posted 06-16-2007 01:24 PM ET (US)   Profile for davej14   Send Email to davej14  
I purchased a new GAM SS2 antenna and the ADAPT II mounting base. I really like the light weight small size of the antenna base coil as compared to my previous Shakespeare 5240R but I must say that, in my opinion, the ADAPT II base is not well thought out. When the antenna is screwed into the base, there is an o-ring that looks like it is supposed to seal between the base and the housing of the antenna coil. Unfortunately, the threads bottom out before the o-ring can form a tight seal. The design of the base is such that without this seal, water will intrude into the area of the antenna connection inside the ADAPT II base. Salt water would be particularly problematic.

Do I have a defective base or have others with this combination have the same problem?

davej14 posted 06-17-2007 02:54 PM ET (US)     Profile for davej14  Send Email to davej14     
Update, while waiting for a reply from GAM about this, I purchased some o-rings that are 5/8" ID with a 3/32" cross section. Adding one of these to the original seems to seal up the gap properly.
Tom W Clark posted 07-01-2007 09:14 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Yesterday I installed my new GAM VHF antenna and its SS2 adapter. I noted that the GAM antenna had the O-ring but also had a very thin hex nut below the O-ring that would have jammed into the plastic of the SS2 had I not removed it.

After removing the hex nut I then screwed the antenna onto the SS2 adapter and it managed to thread all the way down to the point where the stainless steel base of the antenna made contact with the plastic of the adapter. The O-ring was not visible any more and I presume it is making contact with both parts, but I cannot be sure.

Is this the way it is supposed to assemble?

As an aside: I am VERY pleased to have this new VHF antenna and to have disposed of the old 7 foot Shakespeare fiberglass glass "eye poker".

I forgot to lower this old antenna once and did not clear a train trestle near my ramp by about one inch. The tip broke off and since the coax was split and frayed from weather and age, I needed a replacement one way or the other.

Thank you Jim Hebert for turning me onto the GAM antenna. Sitting on top of my RADAR arch, the base is about seven feet above water level and is nearly invisible.

jimh posted 07-01-2007 10:51 PM ET (US)     Profile for jimh  Send Email to jimh     
As best as I can remember, the loading coil of the antenna threads onto the ADAP-II mounting adapter and fits quite nicely.

I believe I removed the hex nut from the bottom of the loading coil. This lets the coil thread down and bear against the O-ring, making a cleaner mounting.

By the way, we misjudged the clearance on a very busy highway bridge and whacked the stainless steel whip of the GAM ELECTRONICS antenna against the bottom of the bridge. We needed about another 2-inches of clearance. If that had been a fiberglass antenna it probably would have broken. So far if not for the flexible whip of SS-2 antenna, that would make about my third new fiberglass antenna since last August.

Reception has been great with this antenna. On eastern Lake Ontario I was ten for ten on weather channel reception, a new record. Of course, half of them were in French....

Please note the following text from the article, emphasis added:

Installation Details

...there is a stainless steel mounting nut supplied with the SS-2 antenna. This should be removed before threading the antenna onto ADAP-II mount. This nut is used when the antenna is mounted on a different type of mount and is not needed with the ADAP-II base.

davej14 posted 07-05-2007 08:26 PM ET (US)     Profile for davej14  Send Email to davej14     
In my case I had removed the hex nut. The o-ring didn't seat properly because the antenna connector bottomed out on the potting material inside of the adapt II fitting. It needed a second o-ring to make up the gap. With the antenna screwed completely down, I can see half of the second o-ring. The seal is now adequate.

GreatBayNH posted 07-10-2007 04:21 PM ET (US)     Profile for GreatBayNH  Send Email to GreatBayNH     
That's odd. I didn't have an issue with my GAM SS2 antenna and the ADAPT II mounting base. This may be a defect with your hardware.
davej14 posted 07-13-2007 11:02 AM ET (US)     Profile for davej14  Send Email to davej14     

If I were you I would add another o-ring to insure a compressive seal. The surface against the o-ring ID is threaded so it functions more as a gasket than an o-ring. Unless there is some minimal compression to the shell of the antenna base there is a pathway for moisture to reach the connector. I am kind of anal about things like this. I bought a package of o-rings and only needed one. If you e.mail me your address I will send you a couple.

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