According to the NOTAMS below, some frequency changes took place at Ramstein:
L0463/20 - AERODROME BE ADVISED, ETAR UHF FREQUENCY CHANGES: GCA FACILITY
CHANGE: FREQUENCY 356.225 TO 284.675. TOWER FACILITY CHANGE:
FREQUENCY 279.65 TO 356.85 AND 308.775 TO 300.65. REFERENCE ATIS
FOR UPDATES. 14 OCT 22:09 2020 UNTIL 15 DEC 23:59 2020. CREATED: 14 OCT 22:09
2020
L0442/20 - BE ADVISED, RAMSTEIN AMCC FREQUENCIES UPDATED TO VHF 131.460 AND
UHF 301.1. IF UNABLE TO REACH, CALL VIA SAT PHONE AT DSN
314-479-4121 OR COMMERCIALLY +49 6371464121. 22 SEP 00:01 2020
UNTIL FURTHER NOTICE. 08 OCT 05:56 2020 UNTIL 20 NOV 23:59 2020. CREATED: 08
OCT 05:56 2020
The strange thing is that it is for a predefined period.