: OTA Waterproofing, Sealants, Adhesives, Paint, Enclosures
2009-01-28, 11:13 AM
There are small tubes of black goo available at electrical supply shops, and even at home centers. Oxguard or some such brand. Apply liberally at the connection and then tighten the fasteners. Should help things last longer.
But for true longer life, the connections should be weather shielded, either in a container or with a tar-like weather-sealing compound.
Possibly the "liquid electrical tape" stuff might also work -- I've got an experiment running here that uses that stuff on a couple of my antennas.
2009-01-28, 02:32 PM
Oxguard or some such brandDoes it have dielectric properties?
I've used Burndy Penetrox for years for dissolving rust and corrosion but I think it might have some slight metallic properties. No idea if that is enough to cause any reception problems but I doubt it... (?)
2009-01-28, 10:07 PM
Does it have dielectric properties?
It's conductive, deliberately so (designed for aluminum wiring connection points).
2009-02-01, 02:03 PM
I got a Google hit on Ace Hardware. You might want to look for Burndy Penetrox too - hydro guys use that to clean and deox aluminum return lines and copper joints.
Looks like Ox-Gard is cheaper than Penetrox.
2009-03-02, 10:34 PM
How would you winterize the Balun, with RTV silicone?
2009-03-02, 11:29 PM
I think what I am going to do, after I see everything is working correctly, is use shrink tubing a little larger than the balun and fill it with hot glue. Then use ox guard on the threads. That should weatherproof it enough (I hope).
2009-03-03, 12:57 AM
What is OXgard ?
2009-03-03, 01:27 AM
with RTV silicone
I use aquarium/food grade silicon sealant. Some of the RTV stuff may be a little conductive, so meter it out on the ohmmeters highest range. Coax seal also works well.
Oxgard is stuff to keep aluminum electrical connections from oxidizing. Its sold at Home Depot and other places.
2009-03-03, 08:37 AM
The is electrical grade RTV (GE white RTV 162). They us it on PC board to stop large part from moving (get it thur vibration testing).
2009-03-03, 10:14 AM
What is OX guard ?
Google it (Oxgard). It is the brand-name for a gooey conductive substance that is used to "rust proof" wiring connections. Specifically intended/marketed for use with aluminum wiring. Sold at Home Depot stores (and others) here in Canada, and probably also in the USA.
2009-03-03, 11:04 AM
Wouldnt heat shrink wrap be just as effective?
This is what I am planning to do with my father inlaws outdoor setup.
2009-03-03, 12:30 PM
Wouldnt heat shrink wrap be just as effective?
The trouble with aluminum is that it oxidizes (rusts) instantly on exposure to air (oyxgen), before one has time to tape it or shrink wrap it. So the connection is already "bad", and will get worse over time.
With a product like Oxgard, one coats each half the connection with the goop, *then* abrades the material (sandpaper, steel wool..) while it is all gooped up, so that the newly exposed metal cannot oxidize. Then join the two halves together, still all gooped up.
That's what is recommended for electrical installs, where mistakes can burn down houses. For antennas, it may be slight overkill, especially indoors. But outdoors, I use the stuff now when/where convenient.
2009-03-03, 12:48 PM
Good point. I guess my reasoning for heat shrink was to prevent water form entering, I did not realy think about corrosion.
2009-03-03, 01:28 PM
Sold at Home Depot stores (and others) here in Canada, and probably also in the USA.
I found the stuff last weekend at Ace Hardware stores.
To help stop corrosion, join/connect metal parts with similiar metals by looking at a galvanic corrosion chart.
Also besides figuring ways to prevent water from entering, think about ways for any water that does enter to quickly escape.
2009-03-14, 11:00 PM
Can I put the balun horizontally under the boom with a try-rap or is that a no no ?
Has that balun been weather proofed ? The basic concept I use for the balun mounting position is to position it so that the least water gets in and/or can get out quickly. That usually means mounting the balun in a horizontal but downward front position, in essense forming a small drip loop from the antenna.
2009-03-14, 11:14 PM
Hi 300 Ohms,
No I did not weather proof it. I am going tomorrow morning on the roof.
Should I WP before putting on the Antenna tonight?
2009-03-15, 12:13 AM
Yeah, I would put some pure silicone sealant on it (or coax seal) to keep out the water. Water in the balun ( or the connection or the cable) isnt a good thing, heh.
2009-03-15, 04:33 AM
intravino, if its not too late you should use roofing tar instead due to the very bitterly cold Montreal winters - silicone tends to ball up in the extreme Canadian winters. :) You can get roofing tar at Rona and its not expensive.
Those Yanks don't know what cold is! :D
2009-03-15, 08:02 AM
I didnt know silicone would do that. On the label its says something like -40F to 300F temperature range. But hey, thats just the label not experience, heh.
Doesnt roofing tar crack at those low temps ?
2009-03-15, 09:33 AM
The best products for sealing coax connections are "coax seal" products. Dunno the real name -- found mine unlabelled at a surplus shop -- but it's a really gooey tar-like substance that is far more tenacious than silicone.
I find silicone just isn't as "sticky" as other substances when a really good seal is required in the presence of some potential flexing / movement. Antennas and elsewhere around the home.