Rohde & Schwarz has created the FSMR3000 microwave measurement receiver, which may be used to calibrate signal generators and attenuators with a single instrument. Tuned RF level measurements, level measurements, analogue modulation, and spectrum analysis are the most essential functions given. In addition to the usual phase noise test with the spectrum analyzer, the R&S FSMR3000 can be upgraded with powerful hardware for high-end phase noise testing
The R&S FSMR microwave measuring receiver enables analogue AM, FM, and M modulation analysis in addition to level calibration. The R&S FSMR3000 is designed to make the signal generator and attenuator calibration simpler, including characteristics that make lab test operations easier to calibrate. All necessary measurement capabilities are provided in a small single box instrument with 8 GHz, 26.5 GHz, and 50 GHz instruments.
The R&S FSMR’s high dynamic range offers a level measuring range of -152 to +30dBm. The R&S NRP50T can cover the entire frequency range from DC to 50 GHz, with a linearity uncertainty of (0.009 dB + 0.005 dB every 10 dB step) and absolute power sensor calibration providing highly accurate signal level measurements.
For AM, FM, and M modulation measurements, built-in analogue modulation analysis is offered. AM modulation depths of 0 to 100% can be detected, as well as FM frequency variations of up to 16 MHz. For modulation analysis, the instrument incorporates a 16-bit AD converter with 200 Msamples/s and an internal signal analysis bandwidth of up to 80 MHz. Modulation measurements on digitally modulated signals are also available if the analysis option is enabled. Pulses can be evaluated automatically. The performance of these signals can be measured without the need for any additional vector signal analyzers.
VOR (VHF Omnidirectional Range, an on-course radio beacon) and ILS (Instrument Landing System, for approach and landing guidance) are amplitude modulated signal air traffic navigation aids that need extremely accurate and reliable modulation measurements. The R&S FSMR may extend calibration to VOR/ILS signal generators and calibrate without the use of a separate tester.
The R&S FSMR3000 additionally offers high-speed spectrum analysis measures up to 50 GHz, allowing for the comprehensive study of harmonics, spurious emissions, and noise figure or phase noise measurements. To measure noise power, ACLR, harmonic distortion, occupied bandwidth, and spectrum emission masks, marker functions and measurement functions for all interesting spectrum measures are supplied. Additional channel filters and a resolution bandwidth of 1Hz to 80 MHz are available.
The R&S FSMR3000 delivers further phase noise analysis thanks to its strong hardware. For high-end applications, a second receive route can be added to the receiver, allowing cross-correlation and improving sensitivity by up to 25 dB depending on the number of correlations. The analyzer is faster than test systems that digitalize the signal after the phase detector because of the superior internal sources and mostly digital architecture, allowing for the simultaneous display of phase noise and AM noise. The results are faster, and there is no need for a second sweep for AM noise measurement. During measurement, both noise contributions can be compared on a single display.
