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AO-51 mode L/S QSB

Hi all,

just worked AO-51 in mode L/S over EU starting at about 19.45 UTC.
I can notice a very deep qsb from about S3 (converter noise) to S9+20.
I can't remember a so deep qsb in the past, 1-2 years ago the sat in 
this mode was with very "stable" signals.
Is AO-51 not well stabilized ? Any info from command stations ?

My working setup is:
RTX: Icom IC-910
converter: DB6NT 2,4 Ghz to 144 Mhz, 0.43 dB NF
antenna: grid 70x70 cm. oriz. pol.

Best '73 de Piero IZ1ERR
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