TPJRAA75 Elbow Plug to Jack 75 Ohm

TNC ELBOW PLUG TO JACK ADAPTOR. 75 Ohm
TNC ELBOW MALE TO FEMALE ADAPTOR. 75 Ohm - Greenpar Equivalent T37P28J999X99

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The TNC connector is a threaded version of the BNC connector. The TNC connector in usually 50 Ω impedance and operates best in the 0–11 GHz frequency spectrum. It has better performance than the BNC connector at microwave frequencies.
It was commonly used by the military for radiom communication and radar applications and has been used in a wide range of radio and wired applications.
The TNC CDonnector was designed in the late 1950s and named after Paul Neill of Bell Labs and Carl Concelman of Amphenol,

Reverse-polarity TNC is a variation of the original TNC specification which reverses the polarity of the mating face.
This is usually achieved by swaping the female contacts normally found in jacks into the plug, and the male contacts normally found in plugs into the jack.

Most TNC connectors are 50-ohm type even when used with coaxial cable of other impedances, but a 75-ohm TNC connector is also available.
These can be recognized by a reduced amount of dielectric in the mating ends. They are intermatable with standard 50 ohm connectors.