GR-874 connector: Difference between revisions

Revision as of 04:38, 22 May 2021

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).

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.

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.

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.

GR-874 connectors continue to be available through IET Labs and Max-Gain Systems.

Links

Pictures

GR-874 connectors on a 106 pulse generator
50 Ω GR-874 connector
125 Ω GR-874 connector
Two 75 Ω and one 50 Ω GR-874 connectors
An assortment of GR-874 connectors and adapters
GR-874 50 Ω Terminator
7M11 delay line front panel with four GR-874 connectors
GR-874 connector on S-1 sampling head
Patent drawings from US2548457

@@ Line 1: / Line 1: @@
 [[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, 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
+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.
-and dielectrically supported sections.  These connectors therefore exhibit very 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,
+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.
-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.
@@ Line 45: / Line 42: @@
 [[Category:Coaxial connectors]]
 [[Category:Probe interfaces]]
+[[Category:Introduced in 1948]]

GR-874 connector: Difference between revisions

Revision as of 04:38, 22 May 2021

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