diff --git a/Modem/afsk.c b/Modem/afsk.c
index 99f5bd9..91b3fa3 100644
--- a/Modem/afsk.c
+++ b/Modem/afsk.c
@@ -81,9 +81,9 @@ INLINE uint8_t sinSample(uint16_t i) {
 
 // Phase sync constants
 #define PHASE_BITS    8
-#define PHASE_INC    1
+#define PHASE_INC    1 										// FIXME: originally 1
 #define PHASE_MAX    (SAMPLESPERBIT * PHASE_BITS)
-#define PHASE_THRESHOLD  (PHASE_MAX / 2)
+#define PHASE_THRESHOLD  (PHASE_MAX / 2) + (PHASE_MAX / 8)  // FIXME: originally /2
 
 // Modulation constants
 #define MARK_FREQ  1200
diff --git a/Modem/cfg/cfg_debug.h b/Modem/cfg/cfg_debug.h
index cd83989..1063984 100644
--- a/Modem/cfg/cfg_debug.h
+++ b/Modem/cfg/cfg_debug.h
@@ -49,7 +49,7 @@
  * Baudrate for the debug console.
  * $WIZ$ type = "int"; min = 300
  */
-#define CONFIG_KDEBUG_BAUDRATE  57600UL
+#define CONFIG_KDEBUG_BAUDRATE  115200UL
 
 /**
  * Clock source for the UART module. You need to write the code to reprogram the respective clock at the required frequency in your project before calling kdbg_init().
diff --git a/Modem/config.h b/Modem/config.h
index f37a75b..b44486a 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 650UL		// The length of the packet preamble in milliseconds
+#define CONFIG_AFSK_PREAMBLE_LEN 1000UL		// 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
diff --git a/Modem/main.c b/Modem/main.c
index f281e4b..396e84a 100644
--- a/Modem/main.c
+++ b/Modem/main.c
@@ -66,7 +66,7 @@ static void init(void)
 	// Initialize serial comms on UART0,
 	// which is the hardware serial on arduino
 	ser_init(&ser, SER_UART0);
-	ser_setbaudrate(&ser, 57600);
+	ser_setbaudrate(&ser, 115200);
 
 	// Create a modem context
 	afsk_init(&afsk, ADC_CH);
@@ -102,7 +102,7 @@ int main(void)
 			// and the byte is not a "transmit" (newline) character,
 			// we should store it for transmission.
 			if ((serialLen < MP1_MAX_FRAME_LENGTH) && (sbyte != 138)) {
-				kprintf("%d\n", sbyte);
+				kprintf("Byte: %d\n", sbyte);
 				// Put the read byte into the buffer;
 				serialBuffer[serialLen] = sbyte;
 				// Increment the read length counter
@@ -126,7 +126,7 @@ int main(void)
 		}
 
 		// Periodically send test data if we should do so
-		if (TEST_TX && timer_clock() - start > ms_to_ticks(4000L)) {
+		if (TEST_TX && timer_clock() - start > ms_to_ticks(5000L)) {
 			// Reset the timer counter;
 			start = timer_clock();
 			// And send a test packet!
diff --git a/Modem/protocol/mp1.c b/Modem/protocol/mp1.c
index 97791c6..f107a3d 100644
--- a/Modem/protocol/mp1.c
+++ b/Modem/protocol/mp1.c
@@ -45,8 +45,8 @@ void mp1Poll(MP1 *mp1) {
 				} else {
 					// Checksum was incorrect
 					mp1Decode(mp1);
-					kprintf("Incorrect checksum. Found %d, ", mp1->buffer[mp1->packetLength]);
-					kprintf("should be %d\n", mp1->checksum_in);
+					//kprintf("Incorrect checksum. Found %d, ", mp1->buffer[mp1->packetLength]);
+					//kprintf("should be %d\n", mp1->checksum_in);
 				}
 			}
 			// If the above is not the case, this must be the
diff --git a/buildrev.h b/buildrev.h
index 16f61fb..58741bc 100644
--- a/buildrev.h
+++ b/buildrev.h
@@ -1,2 +1,2 @@
-#define VERS_BUILD 412
+#define VERS_BUILD 438
 #define VERS_HOST  "vixen"