News | June 19, 2012

Group Delay Measurement Option For Rohde & Schwarz R&S FSW Series Of Signal Analyzers Simplifies Testing

Source: Rohde & Schwarz GmbH & Co. KG

The Rohde & Schwarz R&S FSW-K17 option for the R&S FSW series of high-performance signal and spectrum analyzers makes it possible to perform group delay measurements, which have traditionally been carried out using a vector network analyzer (VNA).

Group delay is a critical specification in satellite communications terminals and other applications as it characterizes transmission path quality for correct amplitude and phase response. With the R&S FSW-K17 option, engineers and technicians can now make this measurement easily with minimal external hardware and calibration steps. Using a spectrum analyzer instead of a VNA also means that additional system test requirements can be addressed by one instrument. Test stations used in manufacturing satellite communications terminals and transponders may not require a separate VNA for the sole purpose of measuring group delay. This helps reduce space requirements and lowers the overall costs of test systems integrated in satellite ground stations.

The R&S FSW-K17 group delay measurement option utilizes a multi-carrier CW signal for calibration and group delay measurement. Calibration corrects internal frequency response and the effects from the external test setup. Calibration files can easily be saved and recalled. Measurement results show frequency response and relative and absolute group delay.

The R&S FSW comes in three models for the frequency ranges from 2 Hz to 8 GHz, 13.6 GHz and 26.5 GHz, and has an analysis bandwidth of 160 MHz, making it well suited for measurements on present and future broadband radar systems and emerging IEEE 802.11ac wireless local area networks (WLAN). The instrument features drag & drop functionality for the display of measurements, using the R&S SmartGrid. This makes it easy to arrange multiple views on the screen, allowing users to compare multiple, different results in a very effective way. The instrument offers extremely low phase noise of -137 dBc/Hz at 10 kHz offset from a 1 GHz carrier and an exceptional -173.5 dBm/Hz noise floor with noise correction, which increases dynamic range. As a result, wider resolution bandwidths can be used while maintaining high sensitivity. This allows spurious-emission and other low-noise measurements to be performed faster and more accurately.

Rohde & Schwarz
Rohde & Schwarz is an independent group of companies specializing in electronics. It is a leading supplier of solutions in the fields of test and measurement, broadcasting, radiomonitoring and radiolocation, as well as secure communications. Established more than 75 years ago, Rohde & Schwarz has a global presence and a dedicated service network in over 70 countries. It has approx. 8400 employees and achieved a net revenue of € 1.6B (US$ 2.2B) in fiscal year 2010/2011 (July 2010 to June 2011). Company headquarters are in Munich, Germany. For more information, visit

SOURCE: Rohde & Schwarz GmbH & Co. KG