Re.: https://mediumwave.info/2025/08/18/hungary-10/
I’m the proud owner of fsdr.duckdns.org 🙂
No, the station on 675 is the IMD product of HGA22+Kossuth Rádió (135.6+540). I cannot imagine what happened. Kossuth Rádió’s signal increased to the overloading point (despite a slight notch filter), and its harmonics (including 1620 khz – 4×540) appeared. The signal strength is unchanged on my other receivers. Usually corroded connectors can cause this, but I spent the whole morning checking the feedline and the antenna itself, but nothing extraordinary was found. Nothing changed at my property and at the neighbourhood. Connectors are ok, antenna is OK. I puzzled out a deeper notch for 540 kHz, to prevent overload, at this point only that I can do.
László Tringer (2025-08-20)