NBN C 94-065-1 ADD 1-1993 Signal transmission on the low-voltage power grid in the frequency band from 3 kHz to 1485 kHz. General regulations, frequency bands and radio interference
1993NBN C 94-065-1 ADD 1-1993 Signal transmission on the low-voltage power grid in the frequency band from 3 kHz to 1485 kHz. General regulations, frequency bands and radio interference