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Connectors: Difference between revisions
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==GR-874== | ==GR-874== | ||
The GR-874 is a hermaphroditic (asexual) RF connector developed | The GR-874 is a hermaphroditic (asexual) RF connector developed by [[General Radio]] in the late 1940's. | ||
by [[General Radio]] in the late 1940's. | They are typically for 50 Ω impedance, but versions for 75 Ω and 125 Ω were available | ||
They are typically for 50 Ω impedance, but | |||
versions for 75 Ω and 125 Ω were available | |||
using the same ground shield and housing, but different center pin geometry. | using the same ground shield and housing, but different center pin geometry. | ||
Different versions of the connector have different maxiumum voltage ratings; | Different versions of the connector have different maxiumum voltage ratings; | ||
1000 V is typical. There are locking and non-locking versions. | |||
There are locking and non-locking versions. | |||
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. | |||
The Tektronix [[519]] uses a 125 Ω GR-874 connector which has | The Tektronix [[519]] uses a 125 Ω GR-874 connector which has | ||
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[[3S1]], [[3S7]], [[3T7]], [[4S1]], [[4S2]], [[5T1]], [[5T1A]], [[5T3]], [[7M11]], [[N]], [[S-1]], [[S-2]], [[106]], [[109]], [[110]], [[113]], [[280]], [[281]], [[282]], and [[282]]. | [[3S1]], [[3S7]], [[3T7]], [[4S1]], [[4S2]], [[5T1]], [[5T1A]], [[5T3]], [[7M11]], [[N]], [[S-1]], [[S-2]], [[106]], [[109]], [[110]], [[113]], [[280]], [[281]], [[282]], and [[282]]. | ||
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=== | |||
* [[017-053]] adapter | * [[017-053]] adapter | ||
* [http://w140.com/gr874_1973_gr_catalog.pdf GR-874 Section of 1973 General Radio Catalog (PDF)] | * [http://w140.com/gr874_1973_gr_catalog.pdf GR-874 Section of 1973 General Radio Catalog (PDF)] | ||
* [http://www.google.com/patents/US2548457 US Patent #2548457, Coaxial connector for high-frequency transmission lines]. Filed 10 Jan 1947, granted 10 Apr 1951. | |||
===Pictures=== | |||
<gallery> | <gallery> | ||
File:Gr874 connector.jpg | File:Gr874 connector.jpg | ||
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File:gr874-125.jpg | 125 Ω GR-874 connector | File:gr874-125.jpg | 125 Ω GR-874 connector | ||
File:50 versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors | File:50 versus 75 ohm gr874.jpg | Two 75 Ω and one 50 Ω GR-874 connectors | ||
File:Various GR874 connectors.jpg | An | File:Various GR874 connectors.jpg | An assortment of GR-874 connectors and adapters | ||
File:Gr 874-w50b.jpg|GR-874 50 Ω Terminator | File:Gr 874-w50b.jpg|GR-874 50 Ω Terminator | ||
File:Tek-7m11-front.jpg | [[7M11]] delay line front panel with four GR-874 connectors | |||
File:S1-crop.jpg | GR-874 connector on [[S-1]] sampling head | |||
File:US2548457.jpg | Patent drawings from US2548457 | |||
</gallery> | </gallery> | ||