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Noise Power Ratio (NPR) Testing of HF Receivers
www.ab4oj.com5 Fig.4. NPR spectrogram on Perseus spectrum scope. H. Measurement results (with 60…5600 kHz band-limiting & 5340 kHz bandstop filters) Tables 1, 1a and 2 present the NPR test results for the radios tested with the W&G RS-50 fitted with 60…5600 kHz band-limiting and 5340 kHz bandstop filters.