874-VQ

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General Radio 874-VQ
Voltmeter detector
General Radio 874-VQ

Available from 1956 to 1973

Manuals
Catalog History
 Document Year Page
Catalog O 1956 49
Catalog P 1959 50
Catalog Q 1961 50
Catalog R 1963 67
Catalog S 1965 86
Catalog T 1968 143
Catalog U 1970 159
Catalog73 1973 249
(All manuals in PDF format unless noted otherwise)

The General Radio 874-VQ is a "voltmeter detector" with two GR-874 connectors for the signal, and either a GR-874 or a BNC connector for the rectified output. It was introduced in Catalog O (1956) and remained available through Catalog 1973, after which only the 874-VQL version with locking connectors remained in the catalog.

The 874-VQL is used in frequency-response measurements with a 1750-A Sweep Drive and 1263-A Amplitude Regulating Power Supply. An 874-VI Voltmeter Indicator can be used for calibrated measurements from 0.1 to 2 V.

The 874-VQ contains a 1N23B diode and a mica capacitor. It is similar to the 874-VR Voltmeter Rectifier, but omits the latter's 50 Ω series resistor, and includes matching elements to compensate for the discontinuity caused by the diode capacitance.

Key Specifications

  • Frequency range: 500 kHz to 2 GHz ("in limited application" up to 7 GHz)
  • Maximum input: 2 V
  • VSWR: ≤1.1 @ 1 GHz, ≤1.2 @ 2 GHz; rising rapidly above 2.5 GHz
  • Resonant frequency: 3.6 GHz

Links

Photos