RACH scan

Hi, I have made some captures on the L-band uplink channels and tried to decode the RACH messages. All four consecutive TCH channels (according to the spot beam) were recorded and a call was made during the recording. I am using the GRC block gmr_rach_scan.grc. I have removed the IQ swap from the graph, as suggested in the mailing list. The sampling rate and samples-per-symbol values have been set to 93.6k and 4, respectively. It ran fine without any errors, but I couldn't see any results either on the wireshark or under /tmp/rach.txt. Maybe I overlooked something here. Any ideas or remarks? Many thanks, Johann