1209-BL: Difference between revisions
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{{GR Product | {{GR Product | ||
|model=1209-BL | |model=1209-BL | ||
|codes=ADMIT | |||
|class=oscillators | |class=oscillators | ||
|summary=Unit Oscillator | |summary=Unit Oscillator | ||
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{{Catalog History}} | {{Catalog History}} | ||
}} | }} | ||
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 | The Type 1209-BL is a general-purpose frequency source covering 180 to 600 MHz. It uses a "[[butterfly circuit]]" to determine frequency. There are no sliding contacts, which makes swept operation possible. Direct amplitude modulation at audio frequencies is accessible by a phone jack on the oscillator housing. | ||
circuit to | |||
Available as an accessory were crystal-diode modulators [[1000-P6]] or [[1000-P7]] that can provide amplitude modulation at frequencies from 0 to 5 MHz. Pulse or square-wave modulation is available with the Type [[1264-A|1264-A modulating power supply]]. | |||
As part of the unit oscillator series, the 120i-BL 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== | ||
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* '''Frequency Range:''' 180 to 600 MHz | * '''Frequency Range:''' 180 to 600 MHz | ||
* '''Frequency Calibration Accuracy:''' 1% | * '''Frequency Calibration Accuracy:''' 1% | ||
* '''Warmup Frequency Drift (Typical):''' .2% | * '''Warmup Frequency Drift (Typical):''' 0.2% | ||
* '''Output Power:''' 300 mW into 50 Ω with Type [[1203-B]] power supply | * '''Output Power:''' 300 mW into 50 Ω with Type [[1203-B]] power supply | ||
Latest revision as of 18:42, 14 May 2024
The General Radio 1209-BL Unit Oscillator was introduced in Catalog P (1959) and remained available through Catalog Q (1961).
The Type 1209-BL is a general-purpose frequency source covering 180 to 600 MHz. It uses a "butterfly circuit" to determine frequency. There are no sliding contacts, which makes swept operation possible. Direct amplitude modulation at audio frequencies is accessible by a phone jack on the oscillator housing.
Available as an accessory were crystal-diode modulators 1000-P6 or 1000-P7 that can provide amplitude modulation at frequencies from 0 to 5 MHz. Pulse or square-wave modulation is available with the Type 1264-A modulating power supply.
As part of the unit oscillator series, the 120i-BL 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
- Frequency Range: 180 to 600 MHz
- Frequency Calibration Accuracy: 1%
- Warmup Frequency Drift (Typical): 0.2%
- Output Power: 300 mW into 50 Ω with Type 1203-B power supply
Links
- Experimenter January 1958 describing Type 1209-BL
- Litton Industries 6481 Tube Data
- Patent for the Butterfly Tuning Circuit
