宽带版：LoRa信道改为433.1~492.6MHz，步进500kHz，共120信道（信道0起始）

laser_tracing_config.py

@@ -95,7 +95,7 @@ class LaserTracingConfigApp:
         self._fc_display_to_value = {}
         self._fc_value_to_display = {}
         fc_displays = []
-        freq = 470100000
+        freq = 433100000
         ch = 0
         while freq <= 492600000:
             display = f"信道{ch}: {freq / 1000000:.1f}MHz"
@@ -104,7 +104,7 @@ class LaserTracingConfigApp:
             self._fc_value_to_display[str(freq)] = display
             freq += 500000
             ch += 1
-        self.lora_fc_display_var = tk.StringVar(value=self._fc_value_to_display.get("470100000", fc_displays[0] if fc_displays else ""))
+        self.lora_fc_display_var = tk.StringVar(value=self._fc_value_to_display.get("433100000", fc_displays[0] if fc_displays else ""))
         self.lora_fc_combo = ttk.Combobox(lora_frame, textvariable=self.lora_fc_display_var,
                                           values=fc_displays, width=20, state="readonly")
         self.lora_fc_combo.grid(row=0, column=1, padx=2)