Uploaded September 2017 | Updated September 2026, 1 week ago
To do this test a sine wave of 150mV RMS at 1,000Hz was fed into one of the aux inputs. Nothing was fed into the other channel at this time. Volume control of receiver was brought up to right before clipping, then turned down to 70% of that. Voltage was then read. Now the 150mV to this aux input was removed and fed into the other channel. The oscilloscope was still attached to the original channel. With scope at high volts-per-division only a flat line could be seen. But when scope was at 50mV per division the sine wave filled a full 6 divisions giving about .3V peak-to-peak. The 70% 38 volt peak-to-peak signal was divided by this giving me a figure of about 126. This was the voltage ration. Looking this figure up in my voltage ratio table, I was able to determine that the channel separation was right over 40 decibels.
To do this test a sine wave of 150mV RMS at 1,000Hz was fed into one of the aux inputs. Nothing was fed into the other channel at this time. Volume control of receiver was brought up to right before clipping, then turned down to 70% of that. Voltage was then read. Now the 150mV to this aux input was removed and fed into the other channel. The oscilloscope was still attached to the original channel. With scope at high volts-per-division only a flat line could be seen. But when scope was at 50mV per division the sine wave filled a full 6 divisions giving about .3V peak-to-peak. The 70% 38 volt peak-to-peak signal was divided by this giving me a figure of about 126. This was the voltage ration. Looking this figure up in my voltage ratio table, I was able to determine that the channel separation was right over 40 decibels.
