diff --git a/target_simulator/gui/main_view.py b/target_simulator/gui/main_view.py
index 415caed..f3e1de8 100644
--- a/target_simulator/gui/main_view.py
+++ b/target_simulator/gui/main_view.py
@@ -413,14 +413,21 @@ class MainView(tk.Tk):
             self.logger.exception("Error while building atomic reset command; falling back to raw string.")
             reset_command = "tgtset /-s"
 
-        # Send the single atomic reset command using the communicator's
-        # send_commands API which accepts a list of commands.
-        if not self.target_communicator.send_commands([reset_command]):
-            self.logger.error("Failed to send atomic reset command to the radar.")
+        # Some radar servers require adjusting internal parameters to accept
+        # large multi-target operations. Send a preparatory command to set
+        # the server t_rows parameter before issuing the atomic tgtset reset.
+        prep_command = "$mex.t_rows=80"
+
+        commands_to_send = [prep_command, reset_command]
+
+        # Send the preparatory command followed by the atomic reset using the
+        # communicator's send_commands API which accepts a list of commands.
+        if not self.target_communicator.send_commands(commands_to_send):
+            self.logger.error("Failed to send preparatory/reset commands to the radar.")
             messagebox.showerror("Reset Error", "Failed to send reset command to the radar.")
             return False
 
-        self.logger.info("Successfully sent atomic reset command: tgtset /-s")
+        self.logger.info("Successfully sent preparatory and atomic reset commands: %s", commands_to_send)
         # Poll the simulation hub for up to a short timeout to ensure the server
         # processed the reset and returned no active targets.
         timeout_s = 3.0
diff --git a/tests/gui/test_main_view_reset.py b/tests/gui/test_main_view_reset.py
new file mode 100644
index 0000000..fb78b18
--- /dev/null
+++ b/tests/gui/test_main_view_reset.py
@@ -0,0 +1,46 @@
+import pytest
+from target_simulator.gui.main_view import MainView
+from target_simulator.core.models import Target
+
+
+class DummyCommunicator:
+    def __init__(self):
+        self.sent_commands = []
+        self.is_open = True
+
+    def send_commands(self, commands):
+        self.sent_commands.extend(commands)
+        return True
+
+    def connect(self, cfg):
+        self.is_open = True
+        return True
+
+    def disconnect(self):
+        self.is_open = False
+
+
+@pytest.fixture
+def main_view(tmp_path, monkeypatch):
+    # Create a MainView but avoid opening the Tk mainloop
+    mv = MainView()
+    # Replace actual communicators with dummy to avoid I/O
+    dummy = DummyCommunicator()
+    mv.target_communicator = dummy
+    return mv
+
+
+def test_reset_radar_state_sends_atomic_tgtset(main_view):
+    mv = main_view
+    # Ensure that the communicator reports open
+    assert mv.target_communicator.is_open
+
+    # Call the reset function
+    result = mv._reset_radar_state()
+
+    # Expect success
+    assert result is True
+    # Verify that two commands were sent: preparatory $mex.t_rows=80 then tgtset /-s
+    assert len(mv.target_communicator.sent_commands) == 2
+    assert mv.target_communicator.sent_commands[0].strip() == "$mex.t_rows=80"
+    assert mv.target_communicator.sent_commands[1].strip() == "tgtset /-s"