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 | '''General Radio 874 (GR-874)''' connectors are hermaphroditic (asexual) coaxial RF connectors developed | ||
by [[General Radio]] in the late 1940s. | by [[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 exhibitvery little reflection and are well suited for gigahertz and pulse applications. | |||
They are typically for 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 | 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]] and possibly others. | ||
Different versions of the connector have different maximum voltage ratings; | |||
1000 V is typical. 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, | ||
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==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Gr874 connector.jpg | |||
Gr874 plug.plug.jpg | |||
Gr874-50.jpg | 50 Ω GR-874 connector | |||
Gr874-125.jpg | 125 Ω GR-874 connector | |||
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]] | ||
Revision as of 14:45, 2 May 2017
General Radio 874 (GR-874) connectors are hermaphroditic (asexual) coaxial RF connectors developed by 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 exhibitvery little reflection and are well suited for gigahertz and pulse applications.
They are typically for 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 and possibly others.
Different versions of the connector have different maximum voltage ratings; 1000 V is typical. 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.
Links
- A Radically New Coaxial Connector for the Laboratory. General Radio Experimenter, Volume XXIII No.5, October 1948
- New and Improved Coaxial Connectors. General Radio Experimenter, Volume 35 No.10, October 1961
- GR-874 Section of 1973 General Radio Catalog (PDF)
- http://en.wikipedia.org/wiki/GR_connector
- US Patent #2548457, Coaxial connector for high-frequency transmission lines. Filed 10 Jan 1947, granted 10 Apr 1951.
- MGS sales list of GR874 hardware
- 017-053 adapter
