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[[File:Gr874 connector.jpg|250px|thumb|right]] | [[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 | They first appeared in the [[grwiki:Catalogs|General Radio Catalog L of 1948]]. | ||
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 | |||
The Tektronix [[519]] uses | 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]], | 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]], [[P6051]] 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== | ==Links== | ||
* [ | * [[Media:Gr874 1973 gr catalog.pdf | GR-874 Section of 1973 General Radio Catalog]] | ||
* [[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. | |||
* | * [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 | ||
* [http://www.mgs4u.com/RF-Microwave/General-Radio-GR-874.htm MGS sales list of GR874 hardware | * [https://www.youtube.com/watch?v=GfPKYc4XLho GR-874 Connector] @ YouTube | ||
* [[017-053]] | {{Documents|Link=GR-874 connector}} | ||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Gr874 connector.jpg | |||
Gr874 plug.plug.jpg | |||
Tek106-outputs.jpg | GR-874 connectors on a [[106]] pulse generator | |||
Gr874-50.jpg | 50 Ω GR-874 connector | |||
Gr874-125.jpg | 125 Ω GR-874 connector | |||
tek_017-050_and_017-071_3.jpg|125 Ω GR-874 connectors on Tek [[017-050]] and [[017-071]] | |||
50 versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors | |||
Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters | |||
Gr 874-w50b.jpg|GR-874 50 Ω Terminator | |||
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> | </gallery> | ||
[[Category:Coaxial connectors]] | [[Category:Coaxial connectors]] | ||
[[Category:Probe interfaces]] | |||
[[Category:Introduced in 1948]] |