diff --git a/Modem/config.h b/Modem/config.h
index 4033e4d..d032a76 100644
--- a/Modem/config.h
+++ b/Modem/config.h
@@ -11,7 +11,7 @@
 #define CONFIG_AFSK_RXTIMEOUT 0				// How long a read operation from the modem
 											// will wait for data before timing out.
 
-#define CONFIG_AFSK_PREAMBLE_LEN 20UL		// The length of the packet preamble in milliseconds
-#define CONFIG_AFSK_TRAILER_LEN 20UL		// The length of the packet tail in milliseconds
+#define CONFIG_AFSK_PREAMBLE_LEN 350UL		// The length of the packet preamble in milliseconds
+#define CONFIG_AFSK_TRAILER_LEN 100UL		// The length of the packet tail in milliseconds
 
 #endif
\ No newline at end of file