1215-B

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

The Type 1215-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 an 874-GA Attenuator, an 874-VR Voltmeter Rectifier, and an 874-VI Voltmeter Indicator it provides an accurately known output voltage for receiver testing.

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

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 Ω 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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