Fixes long standing bug of 'resonator jumping', caused by reversed or…

…der of LO/IF frequency update to and from readout lutman.

pycqed/instrument_drivers/meta_instrument/qubit_objects/CCL_Transmon.py

@@ -887,6 +887,9 @@ def prepare_readout(self, CW=False):
         - generate the RO pulse
         - set the integration weights
         """
+        self._prep_ro_instantiate_detectors()
+        self._prep_ro_sources()
+
         if self.cfg_prepare_ro_awg():
             self.instr_acquisition.get_instr().load_default_settings(
                 upload_sequence=False)
@@ -897,9 +900,6 @@ def prepare_readout(self, CW=False):
             log.warning(
                 '"cfg_prepare_ro_awg" set to False, not preparing readout .')
 
-        self._prep_ro_instantiate_detectors()
-        self._prep_ro_sources()
-
     def _prep_deskewing_matrix(self):
         UHFQC = self.instr_acquisition.get_instr()
         alpha = self.ro_acq_mixer_alpha()