What is considered an acceptable maximum IMD level for an idling PSK signal?
+5 dB
+10 dB
+15 dB
-30 dB✓الإجابة الصحيحة
الشرح
IMD is quoted relative to the wanted signal, so a clean transmitter shows its distortion products well below it, and an idling PSK signal should measure −30 dB or better. Positive figures would mean the distortion products were stronger than the signal itself, which no working transmitter produces.