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1209-BL: Difference between revisions
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The {{Title|General Radio 1209-BL Unit Oscillator}} was introduced in {Catalog P} and remained available through {Catalog Q}. | The {{Title|General Radio 1209-BL Unit Oscillator}} was introduced in {Catalog P} and remained available through {Catalog Q}. | ||
The Type 1209-BL is a general purpose frequency source covering 180 to 600 MHz. It uses what's called a butterfly | The Type 1209-BL is a general purpose frequency source covering 180 to 600 MHz. It uses what's called a [[butterfly circuit]] | ||
to determining frequency, there are no sliding contacts making swept operation possible. Direct amplitude modulation at audio frequencies is accessible by a phone jack on the oscillator housing. Available as an accessory are crystal-diode modulators [[1000-P6]] or [[1000-P7]], frequencies from 0 to 5 MHz can be used to provide amplitude modulation. Pulse or square-wave modulation is available with the Type [[1264-A]] modulating power supply. As part of the unit oscillator series it requires an external power supply, [[1203-B]] and [[1201-A]] are recommended. The 1209-BL is similar to [[1209-B]] in design, construction and specifications except frequency range. | |||
==Specifications== | ==Specifications== | ||