1208-C

The General Radio 1208-C Unit Oscillator was introduced in Catalog R (1963) and remained available through Catalog S (1965).

The Type 1208-C is a general purpose frequency source covering 65 to 500 MHz. Direct amplitude modulation at audio frequencies is provided by a front panel phone jack and with an accessory crystal-diode modulator 1000-P6 or 1000-P7 balanced modulator, frequencies from 0 to 5 MHz can be used to provide amplitude modulation. The 1208-C uses a 2C43 "lighthouse" tube in a Colpitts type oscillator circuit. As part of the unit instrument group it requires an external power supply, the simplest being the 1203-B. Differences between the previous 1208-B are minimal, the panel is redesigned for optional rack mounting.

Specifications

• Frequency Range: 65 to 500 MHz.
• Frequency Calibration Accuracy: +2%.
• Warmup Frequency Drift (Typical): 0.5%.
• Output Power: 170 mW to 240 mW below 250 MHz. 60 mW to 80 mW above 250 MHz; into 50 Ω, power supply dependent.

Links

• Experimenter describing Unit Oscillators June 1965
• Experimenter describing Unit Oscillators August 1963
• GE 2C43 Lighthouse Triode Datasheet
• RCA 2C43 Lighthouse Triode Datasheet
• Compatible with 908-P1 Synchronous Dial Drive and 908-R96 Synchronous Dial Drive

Photos

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  2C43 Lighthouse Tube