The UHF connector[4] is a name for a threaded RF connector. [5][6]
The connector design was invented in the 1930s for use in the radio industry, and is a shielded form of the "banana plug".[7][8][4] It is a widely used standard connector for HF transmission lines on full-sized radio equipment, with BNC connectors predominating for smaller, hand-held equipment.[8]
Quick Facts Type, Production history ...
UHF connector
PL-259 (male) plug. Outside diameter is about 18mm.
The name "UHF" is a source of confusion, since the name of the connectors did not change when the frequency ranges were renamed. The design was named during an era when "UHF" meant frequencies over 30MHz.[9][10][11] Today, Ultra high frequency (UHF) instead refers to frequencies between 300MHz and 3GHz[lower-alpha 1] and the range of frequencies formerly known as UHF is now called "VHF".
Unlike modern connector designs that replaced it, no active specification or standard exists to govern the mechanical and electrical characteristics of the so-called "UHF" connector system making it effectively a deprecated design with no guarantee for suitability to an electrical or mechanical purpose.[citation needed]. Evidence of inconsistency exists.[8][1][12] Testing reveals post WWII connectors designs, such as N connector and BNC connector are electrically superior to the 'UHF' connector for modern UHF frequencies.[8][1] Other testing reveals one UHF connector sample shows negligible effect on frequencies up to 435 MHz.[12]
Other names
The connector reliably carries signals at frequencies up to 100MHz.[1] The coupling shell has a 5⁄8inch 24tpi UNEF standard thread.[4]
The most popular cable plug and corresponding chassis-mount socket carry the old Signal Corps nomenclatures PL-259 (plug) and SO-239 (socket).[13] These are also known as Navy type 49190 and 49194 respectively.[14] A double-ended SO-239 connector is designated as an SO-238.[citation needed]
PL-259, SO-239, PL-258, and several other related military references refer to one specific mechanical design collectively known as the UHF Connector.[4] In some countries, for example in Israel, the term 'PL connector' is confusingly associated rather with the analog phone connector. The designations come from the Joint Electronics Type Designation System, its predecessor AN system, and the earlier SCR (Set, Complete, Radio) system.[15]
Characteristics
This section needs additional citations for verification. (April 2018)
Mechanical
By design, all connectors in the UHF connector family mate using the 5⁄8inch 24tpi threaded shell for the shield connection[4] and an approximately 0.156inch-diameter (4mm) pin and socket for the inner conductor.[citation needed] Similar connectors (M connectors) with an incompatible 16mm diameter, 1mm metric thread have been produced,[16] but these are not standard UHF connectors by definition.[4]
Surge impedance
UHF connectors have a non-constant surge impedance.[4] For this reason, UHF connectors are generally usable through HF and the lower portion of what is now known as the VHF frequency range.[1]
Despite the name, the UHF connector is rarely used in commercial applications for today's UHF frequencies, as the non-constant surge impedance creates measurable electrical signal reflections above 100MHz.[1][17][18]
Virtually all of the impedance bump and loss is in the UHF female. A typical SO-239 UHF female, properly hooded, has an impedance bump of about 35ohms. The length of the bump is typically 1⁄2inch, where the female pin flares to fit over the male pin. This bump can be mitigated by using a honeycomb dielectric in the female pin area. Many VHF/UHF amateur operators use special UHF females that maintain a 50ohm surge impedance.[19]
Power
Some samples of UHF connectors can handle RF peak power levels well over onekilowatt based on the voltage rating of 500Volts peak.[4] In practice, some UHF connector products will handle over 4kV peak voltage.[20] Manufacturers typically test UHF jumpers in the 3-5kV range.[citation needed] UHF connectors are standard on HF amateur amplifiers rated at 1500+Watts output.[citation needed]
In practice, voltage limit is set by the air gap between center and shield.[citation needed] The center pin diameter and contact area is large enough that pin heating is not an issue.[citation needed] UHF connectors are generally limited by cable heating rather than connector failure.[citation needed]
UHF connectors were also used from the 1950s until the late 1970s on television broadcast and video equipment for composite and component video signals, having been mostly superseded by the late 1970s by BNC connectors on professional and industrial video gear, and by the RCA connector on consumer video hardware.
Pollack, Dale (1941). "High-Frequency Transmission and Reception". In Henney, Keith (ed.). Radio Engineering Handbook (3rded.). New York; London: McGraw-Hill Book Company. p.514.
"Introduction to U.H.F.". The Radio Amateur's Handbook (18thed.). West Hartford, CT: American Radio Relay League. 1941. pp.362–363. In Amateur work, the ultra-high-frequency region is considered to include the 56to60MC band and all higher frequency bands available for amateur use.
"The UHF type connector under network analysis". Chris's Amateur Radio and Electronics resource pages. Retrieved 31 January 2012. ...at 432MHz ... we see a loss in the order of 1.0dB, this equates to a transmission loss of around 6Watts with 25Watts input.
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