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1215-B: Difference between revisions
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The {{Title|General Radio 1215-C Unit Oscillator}} was introduced in {{Catalog O}} and remained available through {{Catalog Q}}. | The {{Title|General Radio 1215-C Unit Oscillator}} was introduced in {{Catalog O}} and remained available through {{Catalog Q}}. | ||
The Type | 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 circuit|"butterfly" tuning arrangement]] and lack of sliding contacts, the oscillator is compatible with most sweep devices. In combination with an [[874-GA|874-GA Attenuator]], an [[874-VR|874-VR Voltmeter Rectifier]], and an [[874-VI|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|1000-P6 Crystal Diode Modulator]] accessory, modulation from 0 to 20 MHz is possible that is essentially free of FM. | Direct amplitude modulation at audio frequencies is provided by a phone jack located on the oscillator housing. With a [[1000-P6|1000-P6 Crystal Diode Modulator]] accessory, modulation from 0 to 20 MHz is possible that is essentially free of FM. | ||