diff --git a/.gitignore b/.gitignore
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diff --git a/LICENSE b/LICENSE
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diff --git a/Makefile b/Makefile
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new mode 100755
index 91f4590..3fa3a16
--- a/Makefile
+++ b/Makefile
@@ -167,8 +167,8 @@ REMOVE = rm -f
 COPY = cp
 
 HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex
-ELFSIZE = $(SIZE) -C $(TARGET).elf
-
+# ELFSIZE = $(SIZE) -C $(TARGET).elf
+ELFSIZE = $(SIZE) --mcu=$(MCU) -C $(TARGET).elf
 
 
 # Define Messages
diff --git a/README.md b/README.md
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diff --git a/config.h b/config.h
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diff --git a/device.h b/device.h
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diff --git a/hardware/AFSK.c b/hardware/AFSK.c
old mode 100644
new mode 100755
index fdad26d..9fc5c97
--- a/hardware/AFSK.c
+++ b/hardware/AFSK.c
@@ -405,7 +405,7 @@ void AFSK_adc_isr(Afsk *afsk, int8_t currentSample) {
     //                     Window
     //
     // Every time we detect a signal transition, we adjust
-    // where this window is positioned little. How much we
+    // where this window is positioned a little. How much we
     // adjust it is defined by PHASE_INC. If our current phase
     // phase counter value is less than half of PHASE_MAX (ie, 
     // the window size) when a signal transition is detected,
@@ -440,7 +440,7 @@ void AFSK_adc_isr(Afsk *afsk, int8_t currentSample) {
         afsk->actualBits <<= 1;
 
         // We determine the actual bit value by reading
-        // the last 3 sampled bits. If there is three or
+        // the last 3 sampled bits. If there is two or
         // more 1's, we will assume that the transmitter
         // sent us a one, otherwise we assume a zero
         uint8_t bits = afsk->sampledBits & 0x07;
diff --git a/hardware/AFSK.h b/hardware/AFSK.h
old mode 100644
new mode 100755
index 45e5643..5ec1457
--- a/hardware/AFSK.h
+++ b/hardware/AFSK.h
@@ -42,7 +42,7 @@ inline static uint8_t sinSample(uint16_t i) {
 #define CONFIG_AFSK_RX_BUFLEN 64
 #define CONFIG_AFSK_TX_BUFLEN 64   
 #define CONFIG_AFSK_RXTIMEOUT 0
-#define CONFIG_AFSK_PREAMBLE_LEN 150UL
+#define CONFIG_AFSK_PREAMBLE_LEN 350UL
 #define CONFIG_AFSK_TRAILER_LEN 25UL
 #define BIT_STUFF_LEN 5
 
@@ -52,11 +52,16 @@ inline static uint8_t sinSample(uint16_t i) {
 #define SAMPLESPERBIT (SAMPLERATE / BITRATE)
 #define PHASE_INC    1                              // Nudge by an eigth of a sample each adjustment
 
-#if BITRATE == 960
+#if BITRATE == 300
+    #define FILTER_CUTOFF 600
+    #define MARK_FREQ  1600
+    #define SPACE_FREQ 1800
+    #define PHASE_BITS   10                         // How much to increment phase counter each sample
+#elif BITRATE == 960
     #define FILTER_CUTOFF 600
     #define MARK_FREQ  960
     #define SPACE_FREQ 1600
-    #define PHASE_BITS   10                         // How much to increment phase counter each sample
+    #define PHASE_BITS   10
 #elif BITRATE == 1200
     #define FILTER_CUTOFF 600
     #define MARK_FREQ  1200
diff --git a/hardware/Serial.c b/hardware/Serial.c
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diff --git a/hardware/Serial.h b/hardware/Serial.h
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diff --git a/images/.keepdir b/images/.keepdir
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diff --git a/main.c b/main.c
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diff --git a/precompiled/MicroModemGP-3v-direct.hex b/precompiled/MicroModemGP-3v-direct.hex
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diff --git a/precompiled/MicroModemGP-3v-kiss.hex b/precompiled/MicroModemGP-3v-kiss.hex
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diff --git a/precompiled/MicroModemGP-5v-direct.hex b/precompiled/MicroModemGP-5v-direct.hex
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diff --git a/precompiled/MicroModemGP-5v-kiss.hex b/precompiled/MicroModemGP-5v-kiss.hex
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diff --git a/protocol/AX25.c b/protocol/AX25.c
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diff --git a/protocol/AX25.h b/protocol/AX25.h
old mode 100644
new mode 100755
index 0314bdb..f7d222f
--- a/protocol/AX25.h
+++ b/protocol/AX25.h
@@ -20,13 +20,7 @@
 struct AX25Ctx;     // Forward declarations
 struct AX25Msg;
 
-#if SERIAL_PROTOCOL == PROTOCOL_KISS
-    typedef void (*ax25_callback_t)(struct AX25Ctx *ctx);
-#endif
-
-#if SERIAL_PROTOCOL == PROTOCOL_SIMPLE_SERIAL
-    typedef void (*ax25_callback_t)(struct AX25Msg *msg);
-#endif
+typedef void (*ax25_callback_t)(struct AX25Ctx *ctx);
 
 typedef struct AX25Ctx {
     uint8_t buf[AX25_MAX_FRAME_LEN];
@@ -39,33 +33,6 @@ typedef struct AX25Ctx {
     bool escape;
 } AX25Ctx;
 
-#if SERIAL_PROTOCOL == PROTOCOL_SIMPLE_SERIAL
-    #define AX25_CALL(str, id) {.call = (str), .ssid = (id) }
-    #define AX25_MAX_RPT 8
-    #define AX25_REPEATED(msg, n) ((msg)->rpt_flags & BV(n))
-
-    typedef struct AX25Call {
-        char call[6];
-        uint8_t ssid;
-    } AX25Call;
-
-    typedef struct AX25Msg {
-        AX25Call src;
-        AX25Call dst;
-        AX25Call rpt_list[AX25_MAX_RPT];
-        uint8_t  rpt_count;
-        uint8_t  rpt_flags;
-        uint16_t ctrl;
-        uint8_t  pid;
-        const uint8_t *info;
-        size_t len;
-    } AX25Msg;
-
-    void ax25_sendVia(AX25Ctx *ctx, const AX25Call *path, size_t path_len, const void *_buf, size_t len);
-    #define ax25_send(ctx, dst, src, buf, len) ax25_sendVia(ctx, ({static AX25Call __path[]={dst, src}; __path;}), 2, buf, len)
-    
-#endif
-
 void ax25_poll(AX25Ctx *ctx);
 void ax25_sendRaw(AX25Ctx *ctx, void *_buf, size_t len);
 void ax25_init(AX25Ctx *ctx, FILE *channel, ax25_callback_t hook);
diff --git a/protocol/HDLC.h b/protocol/HDLC.h
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diff --git a/protocol/KISS.c b/protocol/KISS.c
old mode 100644
new mode 100755
index 39c41d5..76c6eb1
--- a/protocol/KISS.c
+++ b/protocol/KISS.c
@@ -27,12 +27,12 @@ void kiss_init(LLPCtx *ctx, Afsk *afsk, Serial *ser) {
 }
 
 void kiss_messageCallback(LLPCtx *ctx) {
-    if (SERIAL_FRAMING == SERIAL_FRAMING_DIRECT) {
+    #if (SERIAL_FRAMING == SERIAL_FRAMING_DIRECT)
         for (unsigned i = 0; i < ctx->frame_len; i++) {
             uint8_t b = ctx->buf[i];
             fputc(b, &serial->uart0);
         }
-    } else {
+    #else
         fputc(FEND, &serial->uart0);
         fputc(0x00, &serial->uart0);
         for (unsigned i = 0; i < ctx->frame_len; i++) {
@@ -48,7 +48,7 @@ void kiss_messageCallback(LLPCtx *ctx) {
             }
         }
         fputc(FEND, &serial->uart0);
-    }
+    #endif
 }
 
 void kiss_csma(LLPCtx *ctx, uint8_t *buf, size_t len) {
diff --git a/protocol/KISS.h b/protocol/KISS.h
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diff --git a/protocol/LLP.c b/protocol/LLP.c
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diff --git a/protocol/LLP.h b/protocol/LLP.h
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diff --git a/util/CRC-CCIT.c b/util/CRC-CCIT.c
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diff --git a/util/CRC-CCIT.h b/util/CRC-CCIT.h
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diff --git a/util/FIFO.h b/util/FIFO.h
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diff --git a/util/constants.h b/util/constants.h
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diff --git a/util/time.h b/util/time.h
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