diff --git a/projects/rfdsatt/rfdsatt.c b/projects/rfdsatt/rfdsatt.c
index 85a9ec3..8137a09 100644
--- a/projects/rfdsatt/rfdsatt.c
+++ b/projects/rfdsatt/rfdsatt.c
@@ -275,6 +275,42 @@ DEFUN(interact, interact_cmd, "interact", "Enter interactive single-key mode")
 	}
 }
 
+DEFUN(test, test_cmd, "test", "Enter interactive test-ramp mode")
+{
+	uint8_t g_chan = 0;
+	uint8_t g_stage = 0;
+	uint8_t g_val = 0;
+
+	printf("Entering interactive test-ramp mode. Press 'X' for exit\r\n");
+
+	while (1) {
+		int ch, rc;
+		if ((ch = getchar()) != EOF) {
+			switch (ch) {
+			case 'X': /* exit */
+				return;
+			case '1': case '2': case '3': case '4': /* channel number */
+				g_chan = ch - '1';
+				g_val = 0;
+				break;
+			case '0': /* set to 0dB */
+				g_val = 0;
+				break;
+			}
+		}
+		if (g_val < 60)
+			g_val += 10;
+		else
+			g_val = 0;
+
+		rc = attenuator_chan_set(g_chan, g_val*4, false);
+		if (rc < 0)
+			printf("Error setting attenuator: %d\r\n", rc);
+
+		msleep(500);
+	}
+}
+
 
 /***********************************************************************
  * main
@@ -341,6 +377,7 @@ int main(void)
 	microvty_register(&att_show_cmd);
 	microvty_register(&att_set_cmd);
 	microvty_register(&interact_cmd);
+	microvty_register(&test_cmd);
 
 	print_banner();
 	microvty_print_prompt();