874-MRL: Difference between revisions
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|image=GR 874-MRL Close-Up.jpg | |image=GR 874-MRL Close-Up.jpg | ||
|caption=General Radio 874-MRL Mixer Rectifier Locking | |caption=General Radio 874-MRL Mixer Rectifier Locking | ||
|series=874 | |series=GR-874 | ||
|introduced=1963 | |introduced=1963 | ||
|discontinued=1978+ | |discontinued=1978+ | ||
|designers= | |designers= | ||
|manuals= | |manuals= | ||
* | * [[Media:GR 874-MR Mixer Rectifier 0874-0337-H 10-1962.pdf|General Radio 874-MR Mixer Rectifier Manual 0874-0337-H 10-1962]] | ||
{{Catalog History}} | {{Catalog History}} | ||
}} | }} | ||
The {{Title|General Radio 874-MRL Mixer Rectifier Locking}} was introduced in {{Catalog R}} and remained available through {{Catalog 1978}}. | The {{Title|General Radio 874-MRL Mixer Rectifier Locking}} was introduced in {{Catalog R}} and remained available through {{Catalog 1978}}. 874-MRL is a version of Type [[874-MR]] with locking connectors. | ||
Type 874-MRL 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 40 to 5000 MHz, the intermediate frequency range is up to 30 MHz. | |||
This enables UHF signals to be monitored conveniently by radio receiver, wide-band amplifier or null detectors operating at the IF frequency. The output signal from the 874-MR passes through a rectifier, then a low-pass filter. | |||
Maximum input from the local oscillator must be kept below 2 V to prevent damage to the 1N21 diode. | |||
==Specifications== | ==Specifications== | ||
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* [[Media:GR Exp 874-MR 05_1950.pdf|Experimenter May 1950 describing Type 874-MR]] | * [[Media:GR Exp 874-MR 05_1950.pdf|Experimenter May 1950 describing Type 874-MR]] | ||
* [[Media:GR Exp 874 Locking 10_1961.pdf|Experimenter October 1961 describing 874 Locking Connectors]] | |||
* [[Media:GR Exp 874 Locking 07_1962.pdf|Experimenter July 1962 describing 874 Locking Connectors]] | |||
* [[Media:1N Series Microwave Diode Data Sheet.pdf|1N21B Microwave Diode Data]] | * [[Media:1N Series Microwave Diode Data Sheet.pdf|1N21B Microwave Diode Data]] | ||
Latest revision as of 19:13, 25 July 2024
The General Radio 874-MRL Mixer Rectifier Locking was introduced in Catalog R (1963) and remained available through Catalog 1978. 874-MRL is a version of Type 874-MR with locking connectors.
Type 874-MRL 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 40 to 5000 MHz, the intermediate frequency range is up to 30 MHz.
This enables UHF signals to be monitored conveniently by radio receiver, wide-band amplifier or null detectors operating at the IF frequency. The output signal from the 874-MR passes through a rectifier, then a low-pass filter.
Maximum input from the local oscillator must be kept below 2 V to prevent damage to the 1N21 diode.
Specifications
- Operating Frequency: 40 to 5000 MHz
- Maximum Crystal Current: 5 mA
- Maximum Input from Local Oscillator: 2 V
- Cut-Off Frequency of Output Fitter: 40 MHz
Links
- Experimenter May 1950 describing Type 874-MR
- Experimenter October 1961 describing 874 Locking Connectors
- Experimenter July 1962 describing 874 Locking Connectors
- 1N21B Microwave Diode Data
Photos
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1N21B Diode
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Schematic
