804-B

The General Radio 804-B UHF Signal Generator was available in Catalog K2 (1942) only.

The Type 804-B is a UHF signal generator designed for radio receiver servicing. It covers 7.5 to 330 MHz in five ranges, and a user defined sixth range for which a blank coil form is supplied with the instrument. With the use of the carrier level meter and attenuator, calibrated levels from 0 to 20 μV are achieved. A front-panel switch selects AM modulation of 400 Hz, external modulation or modulation disabled. Caution should be used as there is incidental FM present, particularly at higher frequencies. The vacuum tube used for the oscillator is an RCA "Acorn" type 955 triode. The 804-B uses the Type 774 coaxial connector for carrier output.

Note: The undocumented Type 804-C pictures are used for this article. A schematic for the 804-C is located at the rear of the 804-B manual.

Specifications

• Frequency Range: 7.5 to 330 MHz in 5 ranges, plus a sixth user defined range
• Frequency Calibration: direct reading within 2%
• Output Voltage Range: 1 to 20 μV for 7.5-100 MHz; 1 to 10 μV for 100-330 MHz
• Output Impedance: 75 Ω
• Modulation: AM internal 400 Hz, 0 to 60%; AM external 100-20,000 Hz, seven volts are required for 50% modulation

Links

• Experimenter November 1939 describing Type 804-A
• Experimenter February 1941 describing Type 804-B
• RCA 955 Acorn Triode Data Sheet

Photos

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  Oscillator Coil Storage