804-B: Difference between revisions

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Type '''804-B UHF Signal Generator'''.
{{GR Product
|model=804-B
|codes=DENSE
|class=generators
|summary=UHF Signal Generator
|image=GR 804-C Close-Up.jpg
|caption=General Radio 804-B UHF Signal Generator
|series=804
|introduced=1942
|discontinued=1942
|designers=
|manuals=
* [[Media:GR 804-B UHF Signal Generator 536-C.pdf|General Radio 804-B UHF Signal Generator Manual 536-C]]
{{Catalog History}}
}}
The {{Title|General Radio 804-B UHF Signal Generator}} was available in {{Catalog K2}} 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 [[774|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==
==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==
==Links==


* [[Media:GR Exp 804-A 11_1939.pdf|Experimenter November 1939 describing Type 804-A]]
* [[Media:GR Exp 804-B 02_1941.pdf|Experimenter February 1941 describing Type 804-B]]
* [[Media:RCA 955 Acorn Triode 06_1944.pdf|RCA 955 Acorn Triode Data Sheet]]


==Photos==
==Photos==
<gallery>
<gallery>
GR 804-C Front A.jpg
GR 804-C Front.jpg
GR 804-C Inside Front.jpg
GR 804-C Case Left Side.jpg
GR 804-C Case Rear.jpg
GR 804-C Case Right Side.jpg
GR 804-C Inside Left A.jpg
GR 804-C Inside Left.jpg
GR 804-C Inside Rear A.jpg
GR 804-C Inside Rear.jpg
GR 804-C Inside Rear Upper Middle.jpg
GR 804-C Rear Lower Center.jpg
GR 804-C Rear Lower Right.jpg
GR 804-C Inside Bottom Left.jpg
GR 804-C Inside Bottom.jpg
GR 804-C Inside Bottom Right.jpg
GR 804-C Case Inside.jpg
GR 804-C Case Inside Close-up.jpg|Oscillator Coil Storage
</gallery>
</gallery>


[[Category:Generators]]
[[Category:Generators]]

Latest revision as of 21:24, 21 May 2024

General Radio 804-B
UHF Signal Generator
General Radio 804-B UHF Signal Generator

Available from 1942 to 1942

Manuals
Catalog History
 Document Year Page
Catalog K2 1942 96
(All manuals in PDF format unless noted otherwise)

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

Photos

  • Oscillator Coil Storage

    Oscillator Coil Storage

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