View source for 874-VR

{{GR Product
|model=874-VR
|codes=COAXRECTOR,0874-9942,0874-9943
|class=coaxial components
|summary=Voltmeter rectifier
|image=GR 874-VR-1.jpg
|caption=General Radio 874-VR
|series=GR-874
|introduced=1951
|discontinued=1973
|designers=
|manuals=
* [[Media:GR-0874-0213-D 1963-11 874-VR-Manual.pdf|874-VR Manual 0874-0213-D (1963)]]
{{Catalog History}}
}}
The {{Title|General Radio 874-VR}} is a "voltmeter rectifier" with two [[GR-874 connector]]s for the signal, and another GR-874 connector for the rectified output.  
It was introduced in {{Catalog M}} and remained available through {{Catalog 1973}}, after which only the [[874-VRL]] version with locking connectors remained in the catalog.

The 874-VR is used in frequency-response measurements with a [[1750-A|1750-A Sweep Drive]] and [[1263-C|1263-C Amplitude Regulating Power Supply]].
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.

The [[874-VQ]] is similar to the 874-VR, but omits the 874-VR's 50 Ω series resistor, and includes matching elements to compensate for the discontinuity caused by the diode capacitance.

==Key Specifications==
* Frequency range: 15 MHz to 2.5 GHz (correction required above 1 GHz)
* Input: 0.1 V to 2 V
* VSWR: ≤1.1 @ 1 GHz, ≤1.2 @ 2 GHz; rising rapidly above 2.5 GHz
* Resonant frequency: 3.8 GHz

==Links==
* [[874-VRL]] is the locking version.
* [[Media:1N Series Microwave Diode Data Sheet.pdf|1N23B Microwave Diode Data]]

==Photos==
<gallery>
GR 874-VR-1.jpg
</gallery>


[[Category:Coaxial Elements]]
[[Category:GR-874]]