874-LBA: Difference between revisions
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{{Catalog History}} | {{Catalog History}} | ||
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The {{Title|General Radio 874-LBA Slotted Line}} was introduced in {{Catalog O}} and remained available through {{Catalog S}}. | The {{Title|General Radio 874-LBA Slotted Line}} was introduced in {{Catalog O}} and remained available through {{Catalog S}}. Its function is to observe the electric field along the inside of a coaxial transmission line using a carriage-mounted probe moving along the line. | ||
By observing minima and maxima of a standing-wave pattern, the characteristics of a circuit connected to the load side of the line can be determined. Applications include frequency measurement and analysis of antennas, components, coaxial elements, and networks. | |||
The 874-LBA is an update of the [[874-LB]], featuring improved accuracy and carriage construction. The redesigned carriage is controlled by a nylon cord and a series of pulleys to remove its drive control to a fixed position at the load end. | |||
The 874-LBA was supplied with a protective wooden case, a spare nylon cable, and a crystal detector. | |||
==Specifications== | ==Specifications== | ||
* '''Characteristic Impedance:''' | * '''Characteristic Impedance:''' 50 Ω, ±0.5% | ||
* '''Scale Accuracy:''' ±(0.1 mm +0.05%) | * '''Scale Accuracy:''' ±(0.1 mm +0.05%) | ||
* '''Frequency Range:''' 300 MHz to 5 GHz, | * '''Frequency Range:''' 300 MHz to 5 GHz. At 300 MHz, the slotted line covers one-half of a wavelength. | ||
* '''Constancy of Probe Penetration:''' ±1½% | * '''Constancy of Probe Penetration:''' ±1½% | ||
==Links== | ==Links== | ||
* [[Media:GR Exp 874-LBA 12_1954.pdf|Experimenter describing Type 874-LBA | * [[Media:GR Exp 874-LBA 12_1954.pdf|Experimenter December 1954 describing Type 874-LBA]] | ||
* [[Media:1N Series Microwave Diode Data Sheet.pdf|1N23B Microwave Diode Data]] | * [[Media:1N Series Microwave Diode Data Sheet.pdf|1N23B Microwave Diode Data]] | ||
* [https://www.youtube.com/watch?v=DovunOxlY1k&t=668s AT&T Archives Wave Machine Tutorial]@ YouTube | * [https://www.youtube.com/watch?v=DovunOxlY1k&t=668s AT&T Archives Wave Machine Tutorial] @ YouTube | ||
==Photos== | ==Photos== | ||
Revision as of 15:57, 26 April 2024
The General Radio 874-LBA Slotted Line was introduced in Catalog O (1956) and remained available through Catalog S (1965). Its function is to observe the electric field along the inside of a coaxial transmission line using a carriage-mounted probe moving along the line.
By observing minima and maxima of a standing-wave pattern, the characteristics of a circuit connected to the load side of the line can be determined. Applications include frequency measurement and analysis of antennas, components, coaxial elements, and networks.
The 874-LBA is an update of the 874-LB, featuring improved accuracy and carriage construction. The redesigned carriage is controlled by a nylon cord and a series of pulleys to remove its drive control to a fixed position at the load end.
The 874-LBA was supplied with a protective wooden case, a spare nylon cable, and a crystal detector.
Specifications
- Characteristic Impedance: 50 Ω, ±0.5%
- Scale Accuracy: ±(0.1 mm +0.05%)
- Frequency Range: 300 MHz to 5 GHz. At 300 MHz, the slotted line covers one-half of a wavelength.
- Constancy of Probe Penetration: ±1½%
Links
- Experimenter December 1954 describing Type 874-LBA
- 1N23B Microwave Diode Data
- AT&T Archives Wave Machine Tutorial @ YouTube
