This reminds me of a known issue we had with DhabiSat 49016. It was also seen in observation about 150-186khz higher. You can still see the original transmitters in the Satnogs DB at 436.908Mhz, and the spooky one on 437.094. This frequency difference is about 186 kHz.
We have also see it with AALTO:
And now we see it again. @PE0SAT is confirming that he doesn’t see the signal in strf recordings. I guess the old Satnogs flowgraph is sensitive for frequencies outside the expected window. Because at the same time we see Phi transmitting on the expected frequency:
I guess the problem @EA4GPZ sees is the station, it is running old 1.6 software.