GR-874 connector: Difference between revisions
No edit summary |
No edit summary |
||
| Line 2: | Line 2: | ||
'''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 | 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. | ||
| Line 11: | Line 11: | ||
1000 V is typical. There are locking and non-locking versions. | 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, 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 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. | 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. | ||
Revision as of 04:48, 7 July 2023
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 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, 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, 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
- 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)
- GR connector @ Wikipedia
- US Patent #2,548,457A, Coaxial connector for high-frequency transmission lines. Filed 10 Jan 1947, granted 10 Apr 1951.
- MGS sales list of GR874 hardware
- 017-051/017-052/017-053/017-055 adapters
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
