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The TNC connector (initialism of "Threaded Neill–Concelman") is a threaded version of the BNC connector.
DescriptionEdit
The interface specifications for the TNC and many other connectors are referenced in MIL-STD-348.<ref name="MIL-STD-348">Template:Cite book</ref> The connector has a 50 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.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
The TNC connector features a 7/16"-28 thread,<ref>{{#invoke:citation/CS1|citation
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VariationsEdit
Reverse-polarity TNCEdit
Reverse-polarity TNC (RP-TNC, sometimes RTNC) is a variation of the TNC specification which reverses the polarity of the interface. A reverse polarity connector will have the opposite pin of standard connector. Gender is determined by the threading of the connector. On a male connector, the threading will be on the inside. On a female connector the threading is on the outside.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Because they were not readily available, RP-TNC connectors have been widely used by Wi-Fi equipment manufacturers to comply with specific local regulations, such as those from the FCC,<ref>U.S. Code of Federal Regulations: 47 CFR 15.203, available at http://www.ecfr.gov</ref> which are designed to prevent consumers from connecting antennas which exhibit gain and therefore breach compliance. The FCC considered that the RP-TNC was acceptable in preventing consumers changing the antenna; but by 2000 it regarded them as readily available,<ref>FCC public notice, "OET clarifies antenna connector requirements for Part 15 Unlicensed Transmitters", http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-00-1087A1.pdf</ref> though delaying its ruling indefinitely.<ref>FCC public notice, "OET extends effective data of antenna connector requirement indefinitely" http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-00-2225A1.pdf</ref> As of 2013, leading manufacturers are still using RP-TNC connectors on their Wi-Fi equipment.<ref>Getting Started Guide: Cisco 3600 Series Access Points http://www.cisco.com/en/US/docs/wireless/access_point/3600/quick/guide/ap3600getstart.html#wp59090</ref>
TNCAEdit
The TNCA connector is a variant of the TNC connector specified in MIL-STD-348<ref name="MIL-STD-348" /> designed to provide an air gap in the dielectric region between the male and female connectors. The female TNCA connector is nearly identically to the standard TNC female connector, while the male TNCA connector provides the air cavity differentiating it from a standard male TNC connector. As such, TNCA connectors are mechanically compatible with standard TNC connectors.
75 ohm TNCEdit
Most TNC connectors are 50-ohm type even when used with coaxial cable of other impedances,Template:Citation needed but a 75-ohm series is also available, providing a good SWR to about 1 GHz.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> These can be recognized by a reduced amount of dielectric in the mating ends. They are intermatable with standard types.
See alsoEdit
ReferencesEdit
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de:Koaxiale Steckverbinder für Hochfrequenzanwendungen#TNC-Steckverbinder ru:Коаксиальный радиочастотный разъём#TNC-коннектор