GR-874 connector: Difference between revisions

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[[File:Gr874 connector.jpg|250px|thumb|right]]
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'''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 are typically for 50 Ω impedance, but versions for 75 Ω and 125 Ω were available
They first appeared in the [[grwiki:Catalogs|General Radio Catalog L of 1948]].
using the same ground shield and housing, but different center pin geometry.
Different versions of the connector have different maximum voltage ratings;
1000 V is typical. There are locking and non-locking versions.


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 gigahertz and pulse applications.


The Tektronix [[519]] uses a 125 Ω GR-874 connector which has
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 same ground housing as the 50 Ω variant,
but has a center pin that is thinner and shaped differently.


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]], [[282]] 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==
* [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://w140.com/gr874_1973_gr_catalog.pdf GR-874 Section of 1973 General Radio Catalog (PDF)]
* [[wikipedia:GR_connector|GR connector]] @ Wikipedia
* [http://www.google.com/patents/US2548457 US Patent #2548457, 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.
* [[017-053]] adapter
* [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
* [https://www.youtube.com/watch?v=GfPKYc4XLho GR-874 Connector] @ YouTube
{{Documents|Link=GR-874 connector}}


==Pictures==
==Pictures==
<gallery>
<gallery>
File:Gr874 connector.jpg
Gr874 connector.jpg
File:Gr874 plug.plug.jpg
Gr874 plug.plug.jpg
File:gr874-50.jpg | 50 Ω GR-874 connector
Tek106-outputs.jpg | GR-874 connectors on a [[106]] pulse generator
File:gr874-125.jpg | 125 Ω GR-874 connector
Gr874-50.jpg | 50 Ω GR-874 connector
File:50 versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors
Gr874-125.jpg | 125 Ω GR-874 connector
File:Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters
tek_017-050_and_017-071_3.jpg|125 Ω GR-874 connectors on Tek [[017-050]] and [[017-071]]
File:Gr 874-w50b.jpg|GR-874 50 Ω Terminator
50 versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors
File:Tek-7m11-front.jpg | [[7M11]] delay line front panel with four GR-874 connectors
Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters
File:S1-crop.jpg | GR-874 connector on [[S-1]] sampling head
Gr 874-w50b.jpg|GR-874 50 Ω Terminator
File:US2548457.jpg | Patent drawings from US2548457
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]]

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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