Before I went on vacation, I wanted to seal some transformer boxes I built. These particular ones are 3db splitters, 50 ohm. One is a 0 degree configuration, the other a 180 degree. Both are built in small Hammond cast aluminum boxes and are BNC in/out.
What I used was a clear epoxy type plastic sold at a craft supplier. This is used for things like putting dollar bills in a block of plexiglass type material. I measured a box and found it took 4 ounces of fluid to fill it. So, I mixed four oz. of the plastic resin in a small disposable drinking cup. Per the instructions, I put 22 drops of catalyst in it. When poured in the splitter box, it flowed nicely around all the parts without any air bubbles left. It filled the box almost to the top. I let it cure while I was on vacation. In a week it turned into something that looked just like plexiglass. The toroid and wiring was clearly visible, and the box looks to be sealed from any water getting in. Of course, the BNC connectors aren't waterproof, but.. I also have found that using anti-sieze compound on the box lid screws helps. They can be tightened more than dry, and don't snap from galling. Permatex makes a good product and can be found at any auto supply house. There was no appreciable heat generated during the curing process, and shrinkage was barely noticeable, if at all. I'm quite pleased with the results. It has made it extremely rugged, and essentially waterproof. I will certainly do this again, if I need to seal something. If I *really* need a waterproof box, I'd use type N connectors, or possibly high end Type F if I were to use RG-6. Those can be waterproofed quite well. I have a picture of one of the units and the plastic stuff used: http://www.am-dx.com/Graphics/sealed_box.jpg Craig Healy Providence, RI _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
