TX (or feeding) fault on CR Dvojka, 954 kHz.
Strong hum on CR Dvojka on 954 kHz to hear on this Kiwi RX: http://sdr.ok2kyj.cz:8073/
In contrast to Radio Patria [SVK] the QRG is stable, the hum is modulated with the audio (hum has fading volume), so it’s probably an isolation fault from powerline – at the QTH or in the feeding line.
This hum is neither on 639 or 1332 kHz to hear.
Nils Düwel (2021-05-01)