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My question is just what the title says. Why is copper tubing used instead of normal wire or enameled wire to make antennas and coils at high frequencies? Does it offer less resistance than normal wire?
Tubing is mostly used for strength. Like rbj, I haven't seen much in the way of copper tubing used for antennas, except for J-Pole antennas where you need to weld two pieces of tubing together...My question is just what the title says. Why is copper tubing used instead of normal wire or enameled wire to make antennas and coils at high frequencies? Does it offer less resistance than normal wire?
and is substantially more expensive than aluminium!!......
i don't think copper is used too much, simply because it tarnishes when exposed to air over long periods.
Copper tubing is used instead of copper wire because it has a much lower resistance.My question is just what the title says. Why is copper tubing used instead of normal wire or enameled wire to make antennas and coils at high frequencies? Does it offer less resistance than normal wire?
Agree, particular aluminum is next to impossible to solder. I was told that you have to scrape the surface under oil and solder under oil after scrapping the surface to prevent oxidation of the surface. Tube for the same weight has a lot more surface area than solid wire.Copper tubing is used instead of copper wire because it has a much lower resistance.
Because of skin effect, the resistance of the tubing or wire depends on the surface area of the conductor and tubing has a much greater surface area than wire, for the same length.
Copper is used instead of aluminum where a reliable electrical contact is needed. It can be easily soldered and connected to a feedline where copper conductors are also used.
Aluminum can be soldered with great difficulty and it corrodes rapidly, especially near the sea.
It is lighter and cheaper than copper, though, and is used for TV antennas where periodic replacement due to corrosion is acceptable.