The "UHF" connector is the old industry standby for frequencies above 50 MHz (during World War II, 100 MHz was considered UHF). The UHF connector is primarily an inexpensive all purpose screw on type that is not truly 50 Ohms. Therefore, it's primarily used below 300 MHz. Power handling of this connector is 500 Watts. The frequency range is 0-300 MHz although a lot of commercial amateur equipment uses this connector on 430-440
“N" connectors were developed at Bell Labs soon after World War II so it is one of the oldest high performance coax connectors. It has good VSWR and low loss through 11 GHz. Power handling of this connector is 300 Watts to 1 GHz. The frequency range is 0-11 GHz
BNC connectors have a bayonet-lock interface which is suitable for uses where where numerous quick connect/disconnect insertions are required. BNC connectors are for, example, used in various laboratory instruments and radio equipment. BNC connector has much lower cut-off frequency and higher loss than the N connector. BNC connectors are commonly available in 50 ohm and 75 ohm versions.
Power handling of this connector is 80 Watts at 1GHz. The frequency range is 0-4 GHz.
TNC connectors are an improved version of the BNC with a threaded interface. Power handling of this connector is 100 Watts at 1 GHz. The frequency range is 0-11 GHz.
SMA or miniature connectors became available in the mid 1960's. They are primarily designed for semi-rigid small diameter (0.141" OD and less) metal jacketed cable, they are also found on smaller handheld equipment for connecting the antenna. Power handling of this connector is 100 Watts at 1 GHz. The frequency range is 0-18 GHz.
All above courtesy of Brian Perrett and Highfield Amateur Radio Club
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