----- Original Message ----- From: "Tom W8JI" <[email protected]> To: "TopBand" <[email protected]> Sent: Thursday, June 21, 2012 3:47 PM Subject: Re: Topband: Chokes for Beverages
>> Another reason to be leery of crimp connectors. My soldered connector >> stubs >> are still fine after 25 years at 2 locations in very high humidity >> enviroments. > > Crimp connections are used all through the CATV industry, and many other > places, and are just fine for many years when properly made. All of my > internal house wiring is non-flooded, as are all the cables in my contest > barn. There are millions of feet of non-flooded cables in MATV and CATV > systems, which is also not a problem provided cables are properly > installed > and correct connectors used. > > The real problem is using non-flooded cables outdoors, which with even a > tiny hole will contaminate. > > Woven copper can actually be worse once it has been damp inside. Strands > in > the weave tarnish, and cause high losses and poor shield performance. > > The advantage of foil is it has no weave, so surface corrosion does not > deteriorate the cable nearly as fast as in woven conductors. The only > problem, provided the shield has not corroded through, are end connections > and the seam. Seam integrity is mostly problematic at UHF and higher. > > 73 Tom The subject was LMR-400 which, of course, is not flooded and uses a tinned copper weave over aluminum foil. If they decided to go with flooding I might even use it outdoors. Of equal concern is the variety of crimp connector vendors as well as off brand 400 "type" cable. Carl KM1H _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
