In a message dated 96-11-12 12:09:38 EST, you write:
> I would not use Noalox or Ox-Gard. The preferred stuff is Penetrox-A.
>It is petroleum based (to prevent moisture and oxygen from causing
corrosion)
>but also has a very heavy concentration of zinc particles suspended in the
>petroleum jelly that, when crunched down on, makes an excellent electrical
>AND rf connection. I have used it for years when assembling antennas,
>clamping
>connectors to tower legs for grounds, etc. I swear by it. Noalox on the
>other hand, if my memory serves me right (and I still have some in the
>garage)
>is simply a greenish petroleum jelly without the heavy concentration of zinc
>particles. The danger there would be in creating a bad AC/DX/RF connection
>by actually insulating the two metals from each other
>
An anti-oxidant material is recommended whenever you have two materials
that are joined in an electrically conducting joint. This includes aluminum
antenna elements, ground wires, feedpoints, etc.
Most anti-oxidants consist of two materials: 1) a vehicle of some sort
(petroleum base, molybdemum or other) and 2) particles of conductive chips
of another sort. The vehicle is typically non-conductive and just holds the
chips in suspension. The particles themselves are what provide the
electrical connection. If you put a meter in the anti-oxidant and tested for
continuity, you probably won't see continuity.
The particles actually penentrate the oxidized layer on the metal as it's
forced together under compression from the mechanial connection (hose clamp,
grounding clamp, etc.) and provide the electrical connection while the
vehicle helps to keep moisture out.
There are many anti-oxidant products on the market. NOALOX DOES contain zinc
particles. Butter-It's-Not from Butternut contain copper in a molybdemum
suspension, KLM has copper and graphite flakes in a petroleum base and other
manufacturers have different formulations. Take your choice, they all work.
73, Steve K7LXC
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