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874-LBA: Difference between revisions
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By observing minima and maxima of a standing-wave pattern, parameters like frequency, standing-wave ratio, or impedance can be measured, and thereby the characteristics of a circuit connected to the load side of the line can be determined. Applications include analysis of antennas, components, coaxial elements, and networks. | By observing minima and maxima of a standing-wave pattern, parameters like frequency, standing-wave ratio, or impedance can be measured, and thereby the characteristics of a circuit connected to the load side of the line can be determined. Applications include 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 is an update of the [[874-LB]], featuring improved accuracy and carriage construction. The redesigned carriage is controlled by a nylon cord forming a complete loop, and a series of pulleys to remove its drive control to a fixed position at the load end. This reduces changes in probe coupling caused by changing forces on the carriage. | ||
The 874-LBA was supplied with a protective wooden case, a spare nylon cable, and a crystal detector. | The 874-LBA was supplied with a protective wooden case, a spare nylon cable, and a crystal detector. | ||
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* '''Characteristic Impedance:''' 50 Ω, ±0.5% | * '''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 (150) MHz to 5 GHz | ||
* '''Length:''' 50 cm (λ/2 @ 300 MHz, λ/4 @ 150 MHz) | |||
* '''Constancy of Probe Penetration:''' ±1½% | * '''Constancy of Probe Penetration:''' ±1½% | ||
* '''Residual SWR:''' 1.025 @ 1 GHz, 1.07 @ 4 GHz | |||
==Links== | ==Links== | ||