Great news our colleague PistonMiner has published their HiSPiCO modem that can be used to decode the TUBIN S band transmitters.
See their post on Mastodon here:
The GitHub repository (it also shows how to decode IR images 
):
PistonMiner/hispico-receiver: Software receiver for the HiSPiCO transmitter
You can find an IQ recording from our ground station here:
iq_recording_2025-11-07T18-32-11Z.raw
Settings:
- Center Frequency: 2264.5 MHz
- Sample Rate: 6 Msps
- Format: iShort / int16
TUBIN’s S band transmitters at 2263 MHz and 2266 MHz are active for every pass over 10° elevation at our Berlin ground station. It should transmit empty frames if nothing is scheduled, but for most passes we schedule a downlink. Telemetry is mostly transmitted during the weekday afternoon/evening passes and images for the night/morning passes and on weekends.
If you are not within Europe let us know and we will try to sent something during a pass over your ground station.