The TNC (threaded Neill-Concelman) connector
is a threaded version of the BNC connector. The connector has a 50 ohm
(Ω) impedance and operates best in the 0–11 GHz frequency spectrum.
It has better performance than the BNC connector at microwave frequencies.
Invented in the late 1950s and named after Paul Neill of Bell Labs and
Carl Concelman of Amphenol, the TNC connector has been employed in a
wide range of radio and wired applications.
TestParts also sells
Reverse Polarity (RP)
connectors. Reverse polarity is a keying system accomplished with
a reverse interface, and ensures that reverse polarity interface connectors
do not mate with standard interface connectors. Most manufactures accomplish
this by inserting female contacts into plugs and male contacts into
jacks. Other manufacturers use reverse threading to accomplish reverse