diff --git a/sodetlib/det_config.py b/sodetlib/det_config.py
index 441eb45f..7a141bcb 100644
--- a/sodetlib/det_config.py
+++ b/sodetlib/det_config.py
@@ -83,7 +83,7 @@ def odict_rep(dumper, data):
 band_defaults = {
     # General
     "band_delay_us": None, "uc_att": None, "dc_att": None,
-    "attens_optimized": False, "tone_power": 12,
+    "attens_optimized": False, "tone_power": 12, "synthesis_scale": None,
 
     # Band-specific tracking stuff
     "lms_gain": 0, "feedback_gain": 2048, "frac_pp": None, "lms_freq_hz": None,
diff --git a/sodetlib/operations/uxm_relock.py b/sodetlib/operations/uxm_relock.py
index fe62af06..8caf6739 100644
--- a/sodetlib/operations/uxm_relock.py
+++ b/sodetlib/operations/uxm_relock.py
@@ -320,7 +320,10 @@ def uxm_relock(
 
     for band in bands:
         band_cfg = cfg.dev.bands[band]
-        S.set_synthesis_scale(band, exp['synthesis_scale'])
+        scale = cfg.dev.bands.get('synthesis_scale')
+        if scale is None:
+            scale = exp['synthesis_scale']
+        S.set_synthesis_scale(band, scale)
         S.set_att_uc(band, band_cfg['uc_att'])
         S.set_att_dc(band, band_cfg['dc_att'])
         S.set_band_delay_us(band, band_cfg['band_delay_us'])
diff --git a/sodetlib/operations/uxm_setup.py b/sodetlib/operations/uxm_setup.py
index 3ce8697c..3606c87e 100644
--- a/sodetlib/operations/uxm_setup.py
+++ b/sodetlib/operations/uxm_setup.py
@@ -442,7 +442,10 @@ def uxm_setup(S, cfg, bands=None, show_plots=True, update_cfg=True,
         S.set_mode_ac()
 
     for band in bands:
-        S.set_synthesis_scale(band, exp['synthesis_scale'])
+        scale = cfg.dev.bands.get('synthesis_scale')
+        if scale is None:
+            scale = exp['synthesis_scale']
+        S.set_synthesis_scale(band, scale)
 
     summary = {}
     summary['timestamps'] = []