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GR-874 connector: Difference between revisions
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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 by [[ | '''General Radio 874 (GR-874)''' connectors are hermaphroditic (asexual) coaxial RF connectors developed by [[grwiki:Eduard Karplus|Eduard Karplus]], [[grwiki:Harold M. Wilson|Harold M. Wilson]] and [[grwiki:William R. Thurston|William R. Thurston]] at [[General Radio]] in the late 1940s, initially "for applications up to 4500 Mc" (4.5 GHz). | ||
They first appeared in the [[grwiki:Catalogs|General Radio Catalog L of 1948]]. | They first appeared in the [[grwiki:Catalogs|General Radio Catalog L of 1948]]. The original versions were friction-supported, in 1961 a locking series was introduced. | ||
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. | 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 | 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 [[519|Tektronix 519 1-GHz oscilloscope]] uses the 125 Ω GR-874 variant. | ||
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. | 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; 1000 V is typical. | Different versions of the connector have different maximum voltage ratings; 1000 V is typical. | ||
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. | 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. | ||