Radio Sultanate of Oman English with distorted audio, Feb.17

OMAN   Reception of Radio Sultanate of Oman English with distorted audio, Feb.17:
1400-1425 on 15140 THU 100 kW / 315 deg to WeEu strong signal, but low modulation
1425-1500 on 15140 THU 100 kW / 315 deg to WeEu good audio & again low modulation
from 1500 on 15140 THU 100 kW / 315 deg to WeEu Arabic, good audio and modulation