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'''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).
'''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).


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.
They first appeared in the [[grwiki:Catalogs|General Radio Catalog L of 1948]].
 
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.


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.  
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 regular 50 Ω version is used in the [[1S1]], [[1S2]], [[3S1]], [[3S7]], [[3T7]], [[4S1]], [[4S2]], [[5T1]], [[5T1A]], [[5T3]], [[7M11]], [[N]], [[S-1]], [[S-2]], [[106]], [[109]], [[110]], [[113]], [[191]], [[280]], [[281]], [[282]], [[P6051]], [[017-0086-00]], [[017-0088-00]], [[035-5031-00]], [[067-506]], [[067-0511-00]], [[067-0594-00]], [[067-0832-01]], and possibly others.
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.


Different versions of the connector have different maximum voltage ratings;
Different versions of the connector have different maximum voltage ratings; 1000 V is typical.
1000 V is typical. There are locking and non-locking versions.
There are locking and non-locking versions.


By the 1970s, GR-874 connectors were being supplanted by SMA connectors in test equipment,
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.
see e.g. the progression from the [[S-1]] to the [[S-4]] sampling heads.


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.
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==
==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]
* [http://w140.com/gr874_1973_gr_catalog.pdf GR-874 Section of 1973 General Radio Catalog (PDF)]
* [[wikipedia:GR_connector|GR connector]] @ Wikipedia
* [[wikipedia:GR_connector|GR connector]] @ Wikipedia
* [[Patent US 2548457A|US Patent #2,548,457A, Coaxial connector for high-frequency transmission lines]]. Filed 10 Jan 1947, granted 10 Apr 1951.
* [[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.mgs4u.com/RF-Microwave/General-Radio-GR-874.htm MGS sales list of GR874 hardware]
* [http://www.mgs4u.com/RF-Microwave/General-Radio-GR-874.htm MGS sales list of GR874 hardware]
* [[017-051]]/[[017-052]]/[[017-053]]/[[017-055]] adapters
* [[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==
==Pictures==
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