874-VQ: Difference between revisions
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|series=GR-874 | |series=GR-874 | ||
|introduced=1956 | |introduced=1956 | ||
|discontinued= | |discontinued=1973 | ||
|designers= | |designers= | ||
|manuals= | |manuals= | ||
{{Catalog History}} | {{Catalog History}} | ||
}} | }} | ||
The {{Title|General Radio 874-VQ}} is a "voltmeter detector" with two [[GR-874 connector]]s for the signal, and either a GR-874 or a [[BNC connector]] for the rectified output. | The {{Title|General Radio 874-VQ}} is a "voltmeter detector" with two [[GR-874 connector]]s for the signal, and either a GR-874 or a [[BNC connector]] for the rectified output. It was introduced in {{Catalog O}} 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|1750-A Sweep Drive]] and [[1263-A|1263-A Amplitude Regulating Power Supply]]. | |||
An [[874-VI|874-VI Voltmeter Indicator]] can be used for calibrated measurements from 0.1 to 2 V. | An [[874-VI|874-VI Voltmeter Indicator]] can be used for calibrated measurements from 0.1 to 2 V. | ||
It contains a 1N23B diode and a mica capacitor. | It contains a 1N23B diode and a mica capacitor. | ||
The 874-VQ is similar to the [[874-VR|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. | The 874-VQ is similar to the [[874-VR|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. | ||
Revision as of 18:02, 25 April 2024
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.
It contains a 1N23B diode and a mica capacitor.
The 874-VQ 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
- 874-VQL is the locking version.
- 874-VQ datasheet (1963)
Photos
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874-VQ, BNC output model
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