1215-B

The General Radio 1215-C Unit Oscillator was introduced in Catalog O (1956) and remained available through Catalog Q (1961).

The Type 1208-B is a general-purpose frequency source covering 50 to 250 MHz. Its an updated version of the 1215-A, most of the improvements are mechanical. It finds use as a generator for bridges, admittance meters, and impedance meters. By the use of the "butterfly" tuning arrangement and lack of sliding contacts, the oscillator is compatible with most sweep devices. In combination with voltmeter combination 874-VR & 874-VI and attenuator 874-GA it provides an accurately known output voltage for receiver testing.

Direct amplitude modulation at audio frequencies is provided by phone jack located on the oscillator housing. With an accessory 1000-P6 Crystal Diode Modulator modulation from 0 to 20 MHz essentially free of fm is possible.

As a unit oscillator, the 1215-B requires an external power supply, type 1203-B is recommended.

Specifications

• Frequency Range: 50-250 MHz
• Frequency Calibration Accuracy: 1% at no load
• Warm-up Frequency Drift: 0.4%
• Output Power: 80 mW into a 50-ohm load

Links

• Experimenter October 1953 describing Type 1215-A
• Experimenter October 1955 describing Updated Unit Oscillators
• Patent for the Butterfly Tuning Circuit

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