diff --git a/owrx/config.py b/owrx/config.py
index 89adf98..eb45fc9 100644
--- a/owrx/config.py
+++ b/owrx/config.py
@@ -9,7 +9,10 @@ class Property(object):
     def setValue(self, value):
         self.value = value
         for c in self.callbacks:
-            c(self.value)
+            try:
+                c(self.value)
+            except Exception as e:
+                print(e)
         return self
     def wire(self, callback):
         self.callbacks.append(callback)
@@ -38,7 +41,10 @@ class PropertyManager(object):
         self.properties[name] = prop
         def fireCallbacks(value):
             for c in self.callbacks:
-                c(name, value)
+                try:
+                    c(name, value)
+                except Exception as e:
+                    print(e)
         prop.wire(fireCallbacks)
         return self
 
diff --git a/owrx/controllers.py b/owrx/controllers.py
index 21c0801..67868a2 100644
--- a/owrx/controllers.py
+++ b/owrx/controllers.py
@@ -80,17 +80,24 @@ class WebSocketMessageHandler(object):
         if (message[:16] == "SERVER DE CLIENT"):
             # maybe put some more info in there? nothing to store yet.
             self.handshake = "completed"
+            print("client connection intitialized")
 
             self.client = OpenWebRxClient(conn)
 
             config_keys = ["waterfall_colors", "waterfall_min_level", "waterfall_max_level",
                            "waterfall_auto_level_margin", "shown_center_freq", "samp_rate", "fft_size", "fft_fps",
                            "audio_compression", "fft_compression", "max_clients", "start_mod",
-                           "client_audio_buffer_size"]
-            config = dict((key, pm.getPropertyValue(key)) for key in config_keys)
-            config["start_offset_freq"] = pm.getPropertyValue("start_freq") - pm.getPropertyValue("center_freq")
-            self.client.write_config(config)
-            print("client connection intitialized")
+                           "client_audio_buffer_size", "start_freq", "center_freq"]
+
+            configProps = pm.collect(*config_keys)
+
+            def sendConfig(key, value):
+                config = dict((key, configProps[key]) for key in config_keys)
+                config["start_offset_freq"] = configProps["start_freq"] - configProps["center_freq"]
+                self.client.write_config(config)
+
+            configProps.wire(sendConfig)
+            sendConfig(None, None)
 
             receiver_keys = ["receiver_name", "receiver_location", "receiver_qra", "receiver_asl",  "receiver_gps",
                              "photo_title", "photo_desc"]