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this post was submitted on 20 Dec 2025
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What is this thing?
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Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
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Coaxial cable can come in different sizes, somewhat related to how strong the signal you want to carry is. First time I was in a TV transmitter I saw a lot of copper pipes running across the ceiling, maybe 6 inches (15 cm) in diameter. I asked what the pipes were for and was told they weren’t pipes, they were coaxial cables. Turns out when you need to carry 30,000 watts of RF the cable needs to get a little bigger. Still 75 ohms resistance!
Yes, just that it was being used as a GIANT cable. The inner piece was about an inch (2.5 cm) diameter pipe carrying the signal, and the outer pipe acted as the shield, with plastic spacers to keep the inner piece aligned.
I feel like “pipe” in most contexts implies something with an open interior to carry liquid or material