Very odd frequency of Voice of Islamic Republic of Iran IRIB on Dec.5:

IRAN   Very odd frequency of Voice of Islamic Republic of Iran IRIB on Dec.5:
from 2011 on  6061.6 ZAH 500 kW / 289 deg to NEAf Arabic, instead nom.6060.0.
Full B-15 schedule of VIRI IRIB via this transmitter in Zahedan is as follows:
0223-0520 on  9895 ZAH 500 kW / 289 deg to NEAf Arabic Al-Quds TV, not checked
0523-1420 on 15750 ZAH 500 kW / 289 deg to NEAf Arabic, observed nominal freq.
1423-1650 on  7360 ZAH 500 kW / 289 deg to WeAs Azeri,  observed nominal freq.
1653-0220 on  6060 ZAH 500 kW / 289 deg to NEAf Arabic, some days on 6061.6v: