Connectors: Difference between revisions

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Revision as of 22:49, 2 July 2015

857 bytes added , 2 July 2015

→‎GR-874

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 ==GR-874==
-The GR-874 is a hermaphroditic (asexual) RF connector developed
+The GR-874 is a hermaphroditic (asexual) RF connector developed by [[General Radio]] in the late 1940's.
-by [[General Radio]] in the late 1940's.
+They are typically for 50 Ω impedance, but versions for 75 Ω and 125 Ω were available
-They are typically for 50 Ω impedance, but
-versions for 75 Ω and 125 Ω were available
 using the same ground shield and housing, but different center pin geometry.
 Different versions of the connector have different maxiumum voltage ratings;
-V is typical.
+V is typical. There are locking and non-locking versions.
-There are locking and non-locking versions.
+GR-874 connectors are carefully engineered to keep a constant impedance
+throughout the signal path, by varying connector diameters between free-air
+and dielectrically supported sections.  These connectors therefore exhibit
+very little reflection and are well suited for gigahertz and pulse applications.
 The Tektronix [[519]] uses a 125 Ω GR-874 connector which has
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 [[3S1]], [[3S7]], [[3T7]], [[4S1]], [[4S2]], [[5T1]], [[5T1A]], [[5T3]], [[7M11]], [[N]], [[S-1]], [[S-2]], [[106]], [[109]], [[110]], [[113]], [[280]], [[281]], [[282]], and [[282]].
+By the 1970s, GR-874 connectors were being supplanted by SMA connectors in test equipment,
+see e.g. the progression from the [[S-1]] to the [[S-4]] sampling heads.
+===Links===
 * [[017-053]] adapter
 * [http://w140.com/gr874_1973_gr_catalog.pdf GR-874 Section of 1973 General Radio Catalog (PDF)]
+* [http://www.google.com/patents/US2548457 US Patent #2548457, Coaxial connector for high-frequency transmission lines]. Filed 10 Jan 1947, granted 10 Apr 1951.
+===Pictures===
 <gallery>
 File:Gr874 connector.jpg
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 File:gr874-125.jpg | 125 Ω GR-874 connector
 File:50 versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors
-File:Various GR874 connectors.jpg | An asortment of GR-874 connectors and adapters
+File:Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters
 File:Gr 874-w50b.jpg|GR-874 50 Ω Terminator
+File:Tek-7m11-front.jpg | [[7M11]] delay line front panel with four GR-874 connectors
+File:S1-crop.jpg | GR-874 connector on [[S-1]] sampling head
+File:US2548457.jpg | Patent drawings from US2548457
 </gallery>