diff --git a/irr_main.c b/irr_main.c
index 526ad64..26df54c 100644
--- a/irr_main.c
+++ b/irr_main.c
@@ -124,7 +124,7 @@ RadioEvents_t revents = {
 static void
 radio_seed_rng(void)
 {
-#if 0
+#if 1
 	uint32_t v;
 	int i;
 
@@ -358,7 +358,7 @@ main()
 	const uint8_t bandwidth = 0 /* 128 kHz */;
 	const uint8_t datarate = 7 /* 128 chips */;
 	const uint8_t coderate = 1 /* 4/5 */;
-	const uint8_t preambleLen = 4 /* symbols */;
+	const uint8_t preambleLen = 8 /* symbols */;
 	const uint8_t fixLen = 0 /* variable */;
 	const uint8_t crcOn = 1 /* on */;
 	const uint8_t freqHopOn = 0 /* off */;
diff --git a/main.c b/main.c
index 29f9081..923e105 100644
--- a/main.c
+++ b/main.c
@@ -225,7 +225,7 @@ main(void)
 	const uint8_t bandwidth = 0 /* 128 kHz */;
 	const uint8_t datarate = 7 /* 128 chips */;
 	const uint8_t coderate = 1 /* 4/5 */;
-	const uint8_t preambleLen = 4 /* symbols */;
+	const uint8_t preambleLen = 8 /* symbols */;
 	const uint8_t fixLen = 0 /* variable */;
 	const uint8_t crcOn = 1 /* on */;
 	const uint8_t freqHopOn = 0 /* off */;