Hi Stefan, just took a close look and noticed the 1 Hz spaced lines around 137.5 kHz. They appear to be a replica of the DCF77 timecode, including the minima at +-10 Hz corresponding to the 100 ms ca
Hi Markus, Hmm, a mystery :-) Actually the band pass filters should not pass a signicicant strength of DCF77. And the 10 kHz Ref signal is at -36 dB f.s., i.e. not overloading anything. Maybe it is a