diff --git a/scripts/interfer.gd b/scripts/interfer.gd
index 7a23863d..6dc01ae9 100644
--- a/scripts/interfer.gd
+++ b/scripts/interfer.gd
@@ -386,6 +386,8 @@ func on_interfer_create(interfer_name, sel_threats, fs_arr, power, u, ecms) -> v
         var id = item.id
         param['freq'] = item.freq
         param['width'] = item.width * width_coef
+        if item.rparams.has('period'):
+            param['period'] = item.rparams['period']
         if (item.rkrp != '') and item.fflags.rkrp and auto_enabled:
             var krp = get_krp(item)
             if krp != '':
@@ -616,6 +618,8 @@ func set_rparams(threat: threats.Threat, params: Dictionary):
         params['width'] = threat.rparams['width'] * width_coef
     else:
         params['width'] = threat.width * width_coef
+    if threat.rparams.has('period'):
+        params['period'] = threat.rparams['period']
     check_width(params)
     if threat.rparams.has('filename'):
         params['filename'] = threat.rparams['filename']
diff --git a/scripts/settings.gd b/scripts/settings.gd
index 15d0ddc8..35bb8ad5 100644
--- a/scripts/settings.gd
+++ b/scripts/settings.gd
@@ -55,7 +55,7 @@ const WIDTH_MIN: = 5.0
 const DUR_MAX: = 1000000.0
 const PERIOD_MAX: = 1000000.0
 const UM_MIN: = -5.0
-const UM_MAX: = 55.0
+const UM_MAX: = 100.0
 
 
 func _ready() -> void: