GR-874 connector: Difference between revisions

GR-874 connector (view source)

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 [[File:Gr874 connector.jpg|250px|thumb|right]]
-'''General Radio 874 (GR-874)''' connectors are hermaphroditic (asexual) coaxial RF connectors developed
+'''General Radio 874 (GR-874)''' connectors are hermaphroditic (asexual) coaxial RF connectors developed by [[wikipedia:Eduard Karplus|Eduard Karplus]] at [[General Radio]] in the late 1940s, initially for applications up to "4500 Mc" (4.5 GHz).
-by [[General Radio]] in the late 1940s.
-They are typically for 50 Ω impedance, but versions for 75 Ω and 125 Ω were available
+They first appeared in the [[grwiki:Catalogs|General Radio Catalog L of 1948]].
-using the same ground shield and housing, but different center pin geometry.
-Different versions of the connector have different maximum voltage ratings;
-V is typical. There are locking and non-locking versions.
-GR-874 connectors are carefully engineered to keep a constant impedance
+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 frequencies up to 9 GHz and pulse applications. For higher frequencies a smaller connector is required to avoid the excitation of wave guide modes.
-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
+Most GR-874 connectors came in 50 Ω impedance.  Versions for 75 Ω and 125 Ω were also available using the same ground shield and housing, but different (thinner) center pin geometry. The Tektronix [[519]] uses the 125 Ω GR-874 variant.
-the same ground housing as the 50 Ω variant,
-but has a center pin that is thinner and shaped differently.
-The regular 50 Ω version is used in the [[1S1]], [[1S2]],
+The regular 50 Ω version is used in the [[1S1]], [[1S2]], [[3S1]], [[3S7]], [[3S76]], [[3T7]], [[4S1]], [[4S2]], [[5T1]], [[5T1A]], [[5T3]], [[7M11]], [[N]], [[S-1]], [[S-2]], [[106]], [[109]], [[110]], [[113]], [[191]], [[261]], [[280]], [[281]], [[282]], [[R293]], [[661]], [[P6025]], [[P6032]], [[P6051]], [[017-0086-00]], [[017-0088-00]], [[035-5031-00]], [[067-506]], [[067-0511-00]], [[067-0513-00]], [[067-0578-99]], [[067-0594-00]], [[067-0832-01]], and possibly others, as well as in many adaptors, attenuators, and terminators.
-[[3S1]], [[3S7]], [[3T7]], [[4S1]], [[4S2]], [[5T1]], [[5T1A]], [[5T3]], [[7M11]], [[N]], [[S-1]], [[S-2]], [[106]], [[109]], [[110]], [[113]], [[191]], [[280]], [[281]], [[282]], [[282]] and possibly others.
-By the 1970s, GR-874 connectors were being supplanted by SMA connectors in test equipment,
+Different versions of the connector have different maximum voltage ratings; 1000 V is typical.
-see e.g. the progression from the [[S-1]] to the [[S-4]] sampling heads.
+There are locking and non-locking versions.
+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, also motivated by the higher bandwidth requirements.
+GR-874 connectors and adapters continue to be available through [http://www.ietlabs.com/gr874-connectors.html IET Labs], [http://www.mgs4u.com/RF-Microwave/General-Radio-GR-874.htm Max-Gain Systems], [https://www.pasternack.com/gr874-adapters-category.aspx Pasternack] and possibly others.
 ==Links==
-* [http://www.ietlabs.com/pdf/GR_Experimenters/1948/GenRad_Experimenter_Oct_1948.pdf A Radically New Coaxial Connector for the Laboratory.  General Radio Experimenter, Volume XXIII No.5, October 1948]
+* [[Media:Gr874 1973 gr catalog.pdf | GR-874 Section of 1973 General Radio Catalog]]
-* [http://www.ietlabs.com/pdf/GR_Experimenters/1961/GenRad_Experimenter_Oct_1961.pdf New and Improved Coaxial Connectors. General Radio Experimenter, Volume 35 No.10, October 1961]
+* [[wikipedia:GR_connector|GR connector]] @ Wikipedia
-* [http://w140.com/gr874_1973_gr_catalog.pdf GR-874 Section of 1973 General Radio Catalog (PDF)]
+* [[Patent US 2548457A|US Patent #2,548,457A, Coaxial connector for high-frequency transmission lines]]. Filed 10 Jan 1947, granted 10 Apr 1951.
-* [http://www.google.com/patents/US2548457 US Patent #2548457, Coaxial connector for high-frequency transmission lines]. Filed 10 Jan 1947, granted 10 Apr 1951.
+* [http://www.mgs4u.com/RF-Microwave/General-Radio-GR-874.htm MGS sales list of GR874 hardware]
-* [[017-053]] adapter
+* [[017-051]]/[[017-052]]/[[017-053]]/[[017-055]] adapters
+* [https://www.youtube.com/watch?v=GfPKYc4XLho GR-874 Connector] @ YouTube
+{{Documents|Link=GR-874 connector}}
 ==Pictures==
 <gallery>
-File:Gr874 connector.jpg
+Gr874 connector.jpg
-File:Gr874 plug.plug.jpg
+Gr874 plug.plug.jpg
-File:gr874-50.jpg | 50 Ω GR-874 connector
+Tek106-outputs.jpg | GR-874 connectors on a [[106]] pulse generator
-File:gr874-125.jpg | 125 Ω GR-874 connector
+Gr874-50.jpg | 50 Ω GR-874 connector
-File:50 versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors
+Gr874-125.jpg | 125 Ω GR-874 connector
-File:Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters
+tek_017-050_and_017-071_3.jpg|125 Ω GR-874 connectors on Tek [[017-050]] and [[017-071]]
-File:Gr 874-w50b.jpg|GR-874 50 Ω Terminator
+versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors
-File:Tek-7m11-front.jpg | [[7M11]] delay line front panel with four GR-874 connectors
+Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters
-File:S1-crop.jpg | GR-874 connector on [[S-1]] sampling head
+Gr 874-w50b.jpg|GR-874 50 Ω Terminator
-File:US2548457.jpg | Patent drawings from US2548457
+Tek-7m11-front.jpg | [[7M11]] delay line front panel with four GR-874 connectors
+S1-crop.jpg | GR-874 connector on [[S-1]] sampling head
+US2548457.jpg | Patent drawings from US2548457
 </gallery>
 [[Category:Coaxial connectors]]
+[[Category:Probe interfaces]]
+[[Category:Introduced in 1948]]