diff --git a/NANOVNA_STM32_F072/board.h b/NANOVNA_STM32_F072/board.h
index 7ab4c29..6c6226d 100644
--- a/NANOVNA_STM32_F072/board.h
+++ b/NANOVNA_STM32_F072/board.h
@@ -26,7 +26,7 @@
  */
 #define BOARD_NANOVNA_STM32_F072
 #define BOARD_NAME              "NanoVNA"
-
+#define USER_CALL		        "DV2JBs"
 /*
  * Board frequencies.
  */