Signal source: band noise on 50.197 MHz CW with 500 Hz BPF setting.
Peak in-band responses set equal as shown.
Sampling was 88,200 sample/sec with 16,384 FFT samples and a running 500-spectrum average with Hanning smoothing.
Radio input to program via audio-to-USB conversion unit, Edirol UA1A with opto-coupled stereo input and output and 44.1 kHz sampling of 16-bit data.
Filter centered on 700 Hz. Almost precisely 500 Hz wide at the top.
Note that IC-746Pro stopband attenuation is approx. 10 dB better than that of IC-756Pro2. This suggests slight superiority of the newer IC-746Pro code and TI DSP processor (vs. ADI SHARC in IC-756Pro II).
Disregard spikes in 0 ~ 250 Hz region (probably AC mains harmonics).
Copyright © 2002, George T. Baker, W5YR
Page created by A. Farson. Last updated: 09/25/2019