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Rohde & Schwarz.
The models .44/.54 from Rohde & Schwarz is a Spectrum Analyzer with AC Voltage 100 to 240 V, Attenuation 0 to 10 dB, Frequency 5 KHz to 44 GHz, Phase Noise -120 to -88 dBc/Hz. More details for models .44/.54 can be seen below.