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GR-874: Difference between revisions
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[[File:GR-874-C8A.jpg|250px|thumb|right]] | [[File:GR-874-C8A.jpg|250px|thumb|right]] | ||
{{Title|General Radio 874 (GR-874) Connectors}} are hermaphroditic (asexual) coaxial RF connectors developed by [[Eduard Karplus]] and others at [[General Radio]] in the late 1940s, initially for applications up to | {{Title|General Radio 874 (GR-874) Connectors}} are hermaphroditic (asexual) coaxial RF connectors developed by [[Eduard Karplus]] and others at [[General Radio]] in the late 1940s, initially "for applications up to 4500 Mc" (4.5 GHz). | ||
They first appeared in {{Catalog L}}. | They first appeared in {{Catalog L}}. The original versions were friction-supported, in {{Catalog Q}} a locking series was introduced. | ||
GR-874 connectors are carefully engineered to keep a constant impedance throughout the signal path, by varying conductor 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. | 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. | For higher frequencies, a smaller connector is required to avoid the excitation of wave guide modes. | ||
Different versions of the connector have different maximum voltage ratings; 1000 V is typical. | |||
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 [[tekwiki:519|Tektronix 519 1-GHz Oscilloscope]] uses a 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 [[tekwiki:519|Tektronix 519 1-GHz Oscilloscope]] uses a 125 Ω GR-874 variant. | ||
Many GR instruments came with GR-874 connectors standard. A large variety of adapters to other coax connector standards was available that allowed the end user to configure their instruments according to their interconnection needs. | Many GR instruments came with GR-874 connectors standard. A large variety of adapters to other coax connector standards was available that allowed the end user to configure their instruments according to their interconnection needs. | ||