Which types of modulation are used for amateur television DVB-T signals?
FM and FSK
QAM and QPSK✓پاسخ درست
AM and OOK
All these choices are correct
توضیح
Amateur DVB-T signals carry data on a large set of OFDM subcarriers, and each subcarrier is modulated with QPSK or with a QAM constellation, the choice trading data rate against robustness. FM, FSK, AM and on-off keying are not part of the DVB-T signal.