Author Topic: Waterproofing for field antennas  (Read 3305 times)

Offline Greekman

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Waterproofing for field antennas
« on: May 05, 2015, 11:30:55 AM »
here is the story....
Saturday i gave a radio basics lesson to some Greek survivalists. (thanks Carl)
but we were rained on in the middle of it.

hence the query for waterproofing field antennas.
I am about to include a rolls of electrical tapes in my kits, plus a roll of selfvulcanizing one.

But one can waterproof the connector, but how can one waterproof a DIY 1/4wave groundplane like this?
http://i176.photobucket.com/albums/w192/greekpreparedness/web-IGP0445_zps6f11a688.jpg~original
A film of water is to form over the main element AND the chassis connector eventually.

what are the implications?

Offline SCWolverine

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Re: Waterproofing for field antennas
« Reply #1 on: May 05, 2015, 12:09:43 PM »
Place tape over the threads you need to connect to, then Silicone the entire assembly...Gob it on and shape it up nicely...

that's prolly what I'd do  ;)

Offline Smurf Hunter

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Re: Waterproofing for field antennas
« Reply #2 on: May 05, 2015, 12:21:34 PM »
I like self-vulcanizing tape for coax ends.


A good tip I heard.

If you go with self-vulcanizing tape, it's suggested to FIRST wrap with normal PVC electrical black tape.  Reason is, the self-melting stuff gets the surface it sticks too very goopy.  If you ever want to remove it, you can peel off the PVC tape.  That's what I did to my coax connections on my mobile antenna.

Here's a google image I found of a dipole feedpoint using the self-vulcanizing tape.


Offline Greekman

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Re: Waterproofing for field antennas
« Reply #3 on: May 05, 2015, 02:48:35 PM »
I know about the tape.
also about a product I have beek killing for fonding it locally.
3M Scoth line, ScotchCoat electrical underwater waterproofing sealer.
think vulcanizing tape in tis liquid form and better.

So I fill every surface with t, no problem, but what about the DIy groundplane issue ?

Offline Carl

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Re: Waterproofing for field antennas
« Reply #4 on: May 05, 2015, 04:03:59 PM »
I know about the tape.
also about a product I have beek killing for fonding it locally.
3M Scoth line, ScotchCoat electrical underwater waterproofing sealer.
think vulcanizing tape in tis liquid form and better.

So I fill every surface with t, no problem, but what about the DIy groundplane issue ?

A foam coffee cup slid down ove the vertical element as your description of the antenna indicates temporary duty,
or the bottom half of a plastic water bottle with a small hole to slid down the vertical element.
This will speed setup and eliminate tape goo.Though pure water does not effect RF on the antenna,the drink
bottle makes it look like you know what you are doing and helps protect the coax connector from water incursion.

Offline Greekman

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Re: Waterproofing for field antennas
« Reply #5 on: May 06, 2015, 01:42:46 AM »
GREAT Tip!