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[[File:GR 1390-B Front.jpg|thumb|450px|right|General Radio 1390-B Random Noise Generator]] | |||
The '''General Radio 1390 Random Noise Generator''' , [[introduced in 1961]] Catalog Q and available to Catalog GR1978. The Type 1390-B provides random noise on three ranges from 20 kHz to 5 MHz. It produces electrical noise using a gas-discharge tube then two stages of amplification. | |||
Between the amplifier stages filter networks shape the three bands. A voltmeter displays RMS voltage then fed to an five position attenuator. | |||
==Specifications== | ==Specifications== | ||
* '''Frequency Range:''' 5 Hz to 5 MHz in three bands. | |||
* '''Output Voltage:''' 3 V for 20 kHz range, 2 V for 500 kHz range, and 1 V for 5 MHz range. | |||
* '''Output Impedance:''' 900 Ω | |||
* '''Output Attenuator:''' 1, .1, .01, .001, and .0001 times the RMS Voltmeter reading. | |||
==Manuals== | |||
* [[Media:GR 1390-B Random Noise Generator 11_1965.pdf|General Radio 1390-B Random Noise Generator Manual 1390-0100-K (1965)]] | |||
==Links== | ==Links== | ||
* [[Media:GRwiki Exp 12_1951.pdf|Experimenter describing 1390-A December 1951]] | |||
* [[Media:GRwiki Exp 01_1960.pdf|Experimenter describing 1390-B January 1960]] | |||
==Photos== | ==Photos== | ||
<gallery> | <gallery> | ||
GR 1390-B Bottom.jpg | |||
GR 1390-B Front.jpg | |||
GR 1390-B Left Side.jpg | |||
GR 1390-B Rear.jpg | |||
GR 1390-B Top.jpg | |||
GR 1390-C Top.jpg | |||
</gallery> | </gallery> | ||
[[Category:Generators]] | [[Category:Generators]] | ||