General Radio 874-D20

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GR874 short circuit terminations for 50 Ω systems are useful for establishing initial coaxial line-length conditions for impedance measurements. Each termnation consists of a fixed short circuit mounted in a GR874 connector. Each of three versions has a counterpart open circuit termination.

• Short circuit terminations for 50 Ω lines
  • 874-WN / WN3 non-locking, 874-WNL locking
  • Frequency: dc to 7 GHz, 9 GHz if locked

The GR874 short circuit termination for 75 Ω systems is a fixed short circuit mounted in a locking GR874 (75 Ω) connector for establishing reference conditions in coaxial lines.

• Short circuit termination for 75 Ω lines
  • 874-WN (75 Ω)
  • Frequency: dc to 2 GHz
  • Plane position: Short circuit is effectively 0 to 0.10 cm toward load from face of bead

GR874 open circuit terminations for 50 Ω systems are useful for establishing initial coaxial line-length conditions for impedance measurements and as a shielding cap for open-circuited lines.

• Open circuit terminations for 50 Ω lines
  • 874-WO / WO3 non-locking, 874-WOL locking
  • Frequency: dc to 7 GHz, 9 GHz if locked

The GR874 open circuit termination for 75 Ω systems is a fixed open circuit mounted in a locking GR874 (75 Ω) connector for establishing reference conditions in coaxial lines. It is also useful as a shielding cap for open circuited lines.

• Open circuit terminations for 75 Ω lines
  • 874-WO (75 Ω)
  • Frequency: dc to 2 GHz
  • Plane position: Open circuit plane is 0 to 0.10 cm toward load from nominal position of face of bead, to match the short circuit plane in 874-WN short circuit termination

GR874 resisitive terminations for 50 Ω systems are useful in slotted-line measurements and for checking accuracy of network analyzers, directional couplers, bridges, and admittance meters. The known location of a purely resisitive termination permits the production of many known complex impedances through the addtion of sections of the 874-L air line.

• Resistance terminations for 50 Ω lines
  • 874-W50B (50 Ω) non-locking
  • 874-W50BL (50 Ω) locking
  • 874-W100 (100 Ω) non-locking
  • 874-W200 (200 Ω) non-locking
  • Frequency: dc to 9 GHz for -W50B and -W50BL, dc to 2 GHz for -W100 and -W200

GR874 adjustable stubs are used for matching or tuning, for adjustable short circuit terminations, and as reactive elements. With an external indicator, the stub can function as a reaction-type wavemeter. The stub consists of a coaxial line with a sliding short circuit of the multiple-spring-finger type.

• Adjustable stubs for 50 Ω lines
  • 874-D20L (20 cm) locking, 874-D50L (50 cm) locking
  • Frequency: dc to 8.5 GHz

A GR874 75 Ω termination uses a fixed 75 Ω resistor mounted in a locking GR874 (75 Ω) connector for establishing reference conditions in coaxial lines, for impedance matching and for use as a termination.

• 75 Ω terminations
  • 874-W75 (75 Ω)
  • Frequency: dc to 2 GHz
  • SWR: <1.005 + 0.013 f_GHz to 2 GHz