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1390-B: Difference between revisions
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[[File:GR 1390-B Front.jpg|thumb|450px|right|General Radio 1390-B Random Noise Generator]] | [[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. | The '''General Radio 1390 Random Noise Generator''' , [[introduced in 1961]] Catalog Q and available to Catalog GR1978. | ||
Between the amplifier stages filter networks shape the three bands. A voltmeter displays RMS voltage then fed to | 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 a five position attenuator. | |||