"Dave" wrote in message
...
NoSPAM wrote:
"Art Unwin" wrote in message
...
"What I use on 7/8 hardline is a copper reducer with a barrel connecter
soldered into one end and then I screw the combination over the hard
line. Now you have an output from the hardline that can fit most things
. One time I filled the copper reducer with dielectric before I inserted
the barrel connecter but could see no difference using max power.
Certainly a lot cheaper than Andrews connectors and if the coax route is
not ideal it is easy and inexpensive to add flexible lengths at tight
corners, such as emerging from underground piping. Hardline gets
extremely rigid and the outer insulation is subject to cracking in the
winter time which is when I seem to have to work on things."
Just to clarify things, the above part is from Art. The following is mine.
Just remember that the aluminum to copper galvanic couple promotes the
corrosion of the aluminum. Keep the contact areas as dry as possible if
you don't want problems. I have found that wrapping several layers of
tightly stretched vinyl electrical tape and then spraying the area with
clear KrylonŽ acrylic varnish does a reasonable job. But since water
vapor can diffuse through the tape, you will need to check the
connection periodically.
73, Dr. Barry L. Ornitz WA4VZQ
Use an elbow to get tight 90s.
http://www.eaa1000.av.org/technicl/c...n/galvanic.htm
This is a good list because it covers many grades of aluminum and stainless
steel (but unfortunately not the 308 stainless alloy often used in wire and
nuts, bolts, and washers found in hardware stores). I wish it listed the
actual voltages referenced to a standard electrode however. Galvanic
couples of less than a tenth of a volt corrode very slowly and are often
acceptable depending on the application. I have found the following
article useful.
http://www.ocean.udel.edu/seagrant/p...corrosion.html
Also I would like to add that the Krylon sprayed over the vinyl tape is
very important. Being an acrylic, clear Krylon protects the vinyl from
ultraviolet damage.
73, Barry WA4VZQ