diff --git a/AntennaTracker/Parameters.cpp b/AntennaTracker/Parameters.cpp
index 5be95dedf7..12b00cb5c8 100644
--- a/AntennaTracker/Parameters.cpp
+++ b/AntennaTracker/Parameters.cpp
@@ -308,10 +308,8 @@ const AP_Param::Info Tracker::var_info[] = {
     // @Group: SERVO
     // @Path: ../libraries/SRV_Channel/SRV_Channels.cpp
     GOBJECT(servo_channels,     "SERVO", SRV_Channels),
-    
-    // @Group: SERIAL
-    // @Path: ../libraries/AP_SerialManager/AP_SerialManager.cpp
-    GOBJECT(serial_manager,    "SERIAL",   AP_SerialManager),
+
+    // AP_SerialManager was here
 
     // @Param: PITCH2SRV_P
     // @DisplayName: Pitch axis controller P gain
@@ -601,6 +599,15 @@ void Tracker::load_parameters(void)
     AP_Param::convert_class(g.k_param_logger, &logger, logger.var_info, 0, true);
 #endif
 
+    static const AP_Param::TopLevelObjectConversion toplevel_conversions[] {
+#if AP_SERIALMANAGER_ENABLED
+        // PARAMETER_CONVERSION - Added: Feb-2024 for Tracker-4.6
+        { &serial_manager, serial_manager.var_info, Parameters::k_param_serial_manager_old },
+#endif
+    };
+
+    AP_Param::convert_toplevel_objects(toplevel_conversions, ARRAY_SIZE(toplevel_conversions));
+
 #if HAL_HAVE_SAFETY_SWITCH
     // configure safety switch to allow stopping the motors while armed
     AP_Param::set_default_by_name("BRD_SAFETYOPTION", AP_BoardConfig::BOARD_SAFETY_OPTION_BUTTON_ACTIVE_SAFETY_OFF|
diff --git a/AntennaTracker/Parameters.h b/AntennaTracker/Parameters.h
index 1db980b04a..91180fa235 100644
--- a/AntennaTracker/Parameters.h
+++ b/AntennaTracker/Parameters.h
@@ -91,10 +91,7 @@ public:
         k_param_can_mgr,
         k_param_battery,
 
-        //
-        // 150: Telemetry control
-        //
-        k_param_serial_manager,     // serial manager library
+        k_param_serial_manager_old = 144,     // serial manager library
         k_param_servo_yaw_type,
         k_param_alt_source,
         k_param_mavlink_update_rate,