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Male F Connector (threaded)
|Type||RF coaxial connector|
|Designer||Eric E. Winston|
7⁄16 in (11 mm) circ. or hex.
|Passband||Typically 0-1 GHz[dubious ]|
The F connector is a coaxial RF connector commonly used for "over the air" terrestrial television, cable television and universally for satellite television and cable modems, usually with RG-6/U cable or, in older installations, with RG-59/U cable. It was invented by Eric E. Winston in the early 1950s while working for Jerrold Electronics on their development of cable television.  In the 1970s it became commonplace on VHF television antenna connections in the United States, as coaxial cables replaced twin-lead, and later for UHF also.
The F connector is inexpensive, yet has good 75 Ω impedance match up to 1 GHz[dubious ] and has usable bandwidth up to several GHz. One reason for its low cost is that it uses the solid conductor (center wire) of the specified types of coaxial cable as the pin of the male connector. This design is subject to the surface properties of the inner conductor (which must be solid wire) and is not corrosion resistant; hence waterproof versions are needed for outside use (for example, on aerials). Corrosion resistance can be improved by coating all bare copper wires with silicone grease. The male connector body is typically crimped, or sometimes screwed, on to the exposed outer braid. The cable industry standard now is to use compression fittings. Female connectors have an external 3/8-32 UNEF thread (9.5 mm diameter). Most male connectors have a matching internally threaded connecting ring, though push-on versions are also available. Push-on F connector ends provide poor shielding against airborne signals (e.g., a nearby TV, Radio, Cell Phone, Cordless Phone, Government radiolocation on 54–1,002 MHz band  transmitters and will interfere with a CATV station).
Weatherproof F Connector
Some component suppliers have in their catalog weatherproof (watertight) "F connectors." Tightness is achieved by inserting an O-ring of about 7 mm between the plug and the socket before tightening, making the union watertight.
It is suitable for domestic terrestrial, cable, and satellite TV installations and offers significant improvements over the Belling-Lee connector (IEC 169-2) used on European terrestrial receivers. It requires slightly more care to properly install the male connector to the cable than with Belling-Lee type and attention should always be paid to the quality of the connector and matching with the cable size.
- “F” Port (Female Indoor) Physical Dimensions, ANSI/SCTE 02 2006 (see www.scte.org).
- International standard IEC 60169-24: Radio-frequency coaxial connectors with threaded coupling, typically for use in 75 Ω cable distribution systems (Type F). (non-free content)
- Electrical Connector. US Patent 3,537,065 by Eric Winston
- Cityfreq United States Scanner Frequencies, Phone Numbers, and IP Addresses.