Just working on the wideband signal spotted by Christoph first on 10160.0 KHz (cf) and more in detail discussed here in his blog. Replied his same results: period consisting of 984 bits (492 symbols) and 24-bit long sub-frames. As a further detail, I want just to add how the sub-frames seem to use different polarity. Same result also for the geo location of Tx site (prob. Luxembourg).
Thanks to Christoph for reporting and sharing.
Signal recorded using the KiwiSDR owned by IW2NKE in Italy.