diff --git a/tnc/data_handler.py b/tnc/data_handler.py
index ef179eca..da9e176a 100644
--- a/tnc/data_handler.py
+++ b/tnc/data_handler.py
@@ -685,7 +685,12 @@ class DATA:
                 # static.RX_FRAME_BUFFER --> existing data
                 # temp_burst_buffer --> new data
                 # search_area --> area where we want to search
-                search_area = 510 - 3  # (3 bytes arq frame header)
+
+
+                data_mode = self.mode_list[self.speed_level]
+                payload_per_frame = modem.get_bytes_per_frame(data_mode) - 2
+                search_area = payload_per_frame - 3  # (3 bytes arq frame header)
+                # search_area = 510 - 3  # (3 bytes arq frame header)
 
                 search_position = len(static.RX_FRAME_BUFFER) - search_area
                 # find position of data. returns -1 if nothing found in area else >= 0