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874-MR: Difference between revisions
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{{GR Product | |||
|model=874-MR | |||
|class=GR-874 | |||
|summary=Mixer Rectifier | |||
|image=GR 874-MR Close-Up.jpg | |||
|caption=General Radio 874-MR Mixer Rectifier | |||
|series=874 | |||
|introduced=1951 | |||
|discontinued=1973 | |||
|designers= | |||
|manuals= | |||
* '''Manual Needed.''' | |||
{{Catalog History}} | |||
}} | |||
The {{Title|General Radio 874-MR Mixer Rectifier}} was introduced in {{Catalog M}} and remained available through {{Catalog 1973}}. | |||
The Type 874-MR is a device used to mix two signals, the input signal and a local oscillator to produce an intermediate frequency. The range of both input and local oscillator is 50 to 5000 MHz and the heterodyne produced intermediate frequency is 30 MHz. This enables UHF signals to be monitored conveniently by radio receiver, wide-band amplifier or null detectors operating at this IF frequency. The output signal from the 874-MR passes through a rectifier then low-pass filter. The maximum input from the local oscillator must be kept below 2 V to prevent damage to the 1N21 rectifier. | |||
==Specifications== | ==Specifications== | ||
* '''Operating Frequency:''' 50 to 3000 MHz | |||
* '''Maximum Crystal Current:''' 5 mA | |||
* '''Maximum Input from Local Oscillator:''' 2 V | |||
* '''Cut-Off Frequency of Output Fitter:''' 40 MHz | |||
==Links== | ==Links== | ||
* [[Media:GR Exp 874-MR 05_1950.pdf|Experimenter May 1950 describing Type 874-MR]] | |||
* [[Media:1N Series Microwave Diode Data Sheet.pdf|1N21B Microwave Diode Data]] | |||
==Photos== | ==Photos== | ||
<gallery> | <gallery> | ||
GR 874-MR Front.jpg | |||
GR 874-MR Front A.jpg | |||
GR 874-MR Rear.jpg | |||
GR 874-MR Open.jpg | |||
GR 874-MR Apart.jpg | |||
GR 874-MR 1N21B.jpg | |||
GR 874-VR Schematic.jpg | |||
</gallery> | </gallery> | ||
[[Category:Coaxial Elements]] | [[Category:Coaxial Elements]] | ||
[[Category:GR-874]] | [[Category:GR-874]] | ||