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Sliding Short Circuits
General
A sliding short is a movable short circuited termination in a precision air line which is used in a variety of laboratory measurement applications. These devices are used to establish a reference plane in a transmission system, as tuning elements in the development of microwave components (mixers, amplifiers, etc.), and tuning high precision CW reflectometer systems. An important application is the calibration of vector network analyzers (VNA). The use of a sliding short for such a calibration is particularly effective when the VNA is to be used for the measurement of highly reflective devices.	The primary criteria for a quality coaxial sliding short are a) a precision transmission structure (air line), b) consistent low noise contacts on the inner and outer conductors and c) a precision connector. Maury manufactures coaxial sliding shorts with a range of performance and operational convenience features. Among the classes available are modular units with interchangeable connectors, high precision devices with dedicated connectors, and rugged general purpose units.
Modular Description Offset shorts are used for banded calibrations of VNA. Those with 2.498cm offsets are also used to measure the effective source match of a VNA after calibration (see Maury data sheet 5C-027). Available Models Model Frequency Range (GHz) Connector Air Line Accuracy 1 2508A 0.9 - 18.0 LPC7 2, Type N female and male 56 dB 2518A 1.8 - 18.0 8036A 2.0 - 34.0 3.5mm female and male 44 dB 8779A1 4.0 - 20.0 2.92mm female 42 dB 20.0 - 40.0 40 dB 8779B1 4.0 - 20.0 2.92mm male 42 dB 20.0 - 40.0 40 dB	2508A
1 Equivalent return loss of the air line impedance (50 ohm reference). 1 Air interface connector with a spring loaded, self- centering center pin that mates with standard 7mm connectors.
High Precision Description These models are movable short circuits with dedicated connectors in precision air lines. The inherent low reflection and accurate transmission line of these instruments, coupled with efficient beryllium copper inner and outer conductor contacting fingers, provide an excellent short circuit. The travel of the shorting plane of these instruments is at least 1/2 wavelength at the lowest rated frequency to permit reversal of the reflection phase. An optional foam-lined wooden instrument case is available for most of these units. Specifications Model Frequency Range (GHz) Connector Air Line Accuracy 1 1959A 1.8 - 18.0 SMA female 56 dB 1959B SMA male 2604A 0.9 - 18.0 7mm	2604A
General Purpose Specifications Frequency Range . . . . . . . . . . . See chart Nominal Impedance . . . . . . . . . . . 50 ohms Travel . . . . . . . . . . . 1/2 wavelength at lowest frequency Connectors> . . . . . . . . . . . See chart	1978D
Frequency Range (GHz) 0.2 - 0.5 0.4 - 1.0 0.8 - 4.0 2.0 - 12.0 Short Travel (inches) 30.0 15.0 7.5 3.0 Length Closed (inches) 32.6 17.6 10.1 5.6 Connector Type Model SMA 1909A (*) 1909B (*) 1909C (*) 1909D (*) Precision N 1978A (*) 1978B (*) 1978C (*) 1978D (*) 7mm 2647A 2647B 2647C 2647D (*) Insert "1" for female, "2" for male connector.
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