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help with antenna please

Old 05-01-2008, 10:00 AM
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Default help with antenna please

snapped my antenna off the other day... bought a new one and instead of tring to run the new line through the t-top got 2 male coaxial conectors with a double female adapter. installed it following the directions with the use fo a soder gun. the problem is when the ends are pushed all the way in and srewed firmly its staticy. if i loosen them and spread them apart slightly it works fine. i dont think they will stay like that when running the boat and also i dont want salt to get in there. any suggestions? maybe the groung or something is off? thanks in advance for any help.
Old 05-01-2008, 12:24 PM
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Default Re: help with antenna please

My advice is to not use the double adapter. What you should have done was cut the cable at the antenna, then used the old cable as a pull for the new cable.

If you already cut the new antenna cable too short to pull through, you are stuck with the adapter. In this case get some heat shrink material, and some "no-ox" or other sort of dielectric (NON-conductive) grease. Slip the heat shrink tube on the cable (make sure it is large enough to fit over the adapter) and then fiddle with the connection so there is no static. Once you get it right, goop the adapter / male connectors up good with the non-conductive grease. Then slip the heat shrink over it and seal it.

The heat shrink material will keep the connectors in place when the boat is running, and between the grease under the heat shrink material and the material itself it will be hard for any water to get to the connection points.

If there is any doubt at all as to the functionality of the radio, have a technician check the standing wave ratio of the antenna. If the SWRs are bad and/or the static sound returns - you may need another new antenna.
Old 05-01-2008, 02:28 PM
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Default RE: help with antenna please

thanks for the info. the cables are caught in the ttop and wont pull thru... i only wish... will try the shrink wrap tomorrow. thanks again.
Old 05-03-2008, 04:31 AM
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Default Re: help with antenna please

Obviously you have a problem with the connector installation, I would take a second look and try to fix the connector installation first, this problem is going to come back unless you fix the problem. Are you using PL259 or TNC connectors for the splice? Sounds like when you tighten the connectors to the barrel splice you are pulling the ground back on one or both of the connectors. If it is a PL259 do you have the ground braid pulled over the small cable adaptor before you screwed it into the connector body? you need to do this to make sure the ground is firmly clamped between the top of the small cable adaptor and the inside of the connector.

The advice on the shrink tube above is a great idea once you fix your problem.

I pulled into my boathouse the other day and snapped off my VHF antenna at the base, forgot to put the antenna down first I put my Bird watt meter on the line only to find out as I expected the antenna was still good and working fine, just broken off at the base. So I sawed it off clean, sanded the surface at the base of the fiberglass antenna radome, and installed it back into the base with marine-tex. Antenna is working just fine and saved myself $100.

Jim
Old 05-03-2008, 06:42 AM
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Default Re: help with antenna please

Definitely need to redo the connectors.

I caught mine on a low limb coming out of the ramp busted it at the base I heated a piece of 3/4" pvc about 16" long and slid it down over it.
Old 05-04-2008, 08:12 AM
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Default Re: help with antenna please

Now THAT was an elegant solution. Tell me you 'lubricated' the hot pvc with low melt hot glue so when everthing cooled its solid.
Old 05-05-2008, 07:38 AM
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Default Re: help with antenna please

jfwireless - 5/3/2008 7:31 AM

I pulled into my boathouse the other day and snapped off my VHF antenna at the base, forgot to put the antenna down first I put my Bird watt meter on the line only to find out as I expected the antenna was still good and working fine, just broken off at the base. So I sawed it off clean, sanded the surface at the base of the fiberglass antenna radome, and installed it back into the base with marine-tex. Antenna is working just fine and saved myself $100.

Jim
I'm assuming that you broke it off below where the cable attaches?
Old 05-07-2008, 04:04 AM
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Default Re: help with antenna please

Yes, it broke off right at the base, didn't damage the antenna or cable attachment at all. Also the fiberglass radome was not cracked, I have seen antenna's that could not be repaired, but most can be.

Jim
Old 05-08-2008, 04:54 AM
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Default Re: help with antenna please

sandyda - 5/4/2008 11:12 AM

Now THAT was an elegant solution. Tell me you 'lubricated' the hot pvc with low melt hot glue so when everthing cooled its solid.
No hot glue, but it is solid.

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