Freq readback 6 digits
After a couple of years of 8.33 frequencies around and almost two years of all frequencies being spoken as 6 digits in theory (with the exception of full 100 kHz) my impression is that there is still much freq load produced by this subject.
Yesterday a non representative count in a high traffic situation (upper airspace sector) showed around 20-30% of all readbacks being either false or the flight deck asking for the freq a second time (some a third time).
Is there anything that can be done about this?
I know, the ground station discipline to use 6 digits is still rather low. Is this a contributing factor? Would omitting the leading "1" (UHF could be preceeded by a "UHF") help?
Thank you