GR-874 connector: Difference between revisions

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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 continue to be available through [http://www.ietlabs.com/gr874-connectors.html IET Labs] and [http://www.mgs4u.com/RF-Microwave/General-Radio-GR-874.htm Max-Gain Systems].
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]
* [[wikipedia:GR_connector|GR connector]] @ Wikipedia
* [http://w140.com/gr874_1973_gr_catalog.pdf GR-874 Section of 1973 General Radio Catalog (PDF)]
* http://en.wikipedia.org/wiki/GR_connector
* [[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==
Line 32: Line 33:
Gr874-50.jpg | 50 Ω GR-874 connector
Gr874-50.jpg | 50 Ω GR-874 connector
Gr874-125.jpg | 125 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
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
Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters

Revision as of 03:47, 16 March 2024

General Radio 874 (GR-874) connectors are hermaphroditic (asexual) coaxial RF connectors developed by Eduard Karplus at General Radio in the late 1940s, initially for applications up to "4500 Mc" (4.5 GHz).

They first appeared in the 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.

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. 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 IET Labs, Max-Gain Systems, Pasternack and possibly others.

Links

Documents Referencing GR-874 connector

Document Class Title Authors Year Links
GenRad Experimenter Oct 1948.pdf Article A Radically New Coaxial Connector for the Laboratory 1948 GR-874 connector
GenRad Experimenter Oct 1961.pdf Article New and Improved Coaxial Connectors 1961 GR-874 connector

Pictures

  • GR-874 connectors on a 106 pulse generator

    GR-874 connectors on a 106 pulse generator

  • 50 Ω GR-874 connector

    50 Ω GR-874 connector

  • 125 Ω GR-874 connector

    125 Ω GR-874 connector

  • 125 Ω GR-874 connectors on Tek 017-050 and 017-071

    125 Ω GR-874 connectors on Tek 017-050 and 017-071

  • Two 75 Ω and one 50 Ω GR-874 connectors

    Two 75 Ω and one 50 Ω GR-874 connectors

  • An assortment of GR-874 connectors and adapters

    An assortment of GR-874 connectors and adapters

  • GR-874 50 Ω Terminator

    GR-874 50 Ω Terminator

  • 7M11 delay line front panel with four GR-874 connectors

    7M11 delay line front panel with four GR-874 connectors

  • GR-874 connector on S-1 sampling head

    GR-874 connector on S-1 sampling head

  • Patent drawings from US2548457

    Patent drawings from US2548457

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