Back to Back BNC 50 Ohm low loss adaptorThis is a back to back BNC adaptor, often referred to as a barrel. Use it to connect two standard male to male BNC RF antenna cables. Ours are 50 Ohm impedance for low signal loss when used to extend UHF radio mic aerials. (There are cheaper ones around but they are usually 75 Ohms impedance and don't work as well)
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