The signals SDB2_B1_PD1,PD2_Audio_100kHz have been temporary added in the DAQ for studying the line drifting as requested by Bas.

Hrec was giving a very nice horizon of 70 Mpc... but this was due WE actuation relay being set in LN1 mode manually : 'Low Noise 1 [byte=0]' sent to CoilsSbWE' but probably without the associated gain in the  DSP changed accordingly.  Hence the WE actuation response was not the standard one and the reconstructed h(t)  was false.