diff --git a/avrrfm.c b/avrrfm.c
index 3fb5bd4..afcc0bc 100644
--- a/avrrfm.c
+++ b/avrrfm.c
@@ -91,6 +91,7 @@
     
     initRadio(868600);
     sendByte(0xaa);
+    sendString("Hello Radio!");
     
     while (true) {
         // do useful stuff
diff --git a/rfm69.c b/rfm69.c
index a6f8a75..4ee16f1 100644
--- a/rfm69.c
+++ b/rfm69.c
@@ -10,7 +10,7 @@
 /**
  * Sets the module to the given operating mode.
  */
-#define set_mode(mode) regWrite(OP_MODE, (opMode & ~MASK_MODE) | (mode & MASK_MODE))
+#define set_mode(mode) regWrite(OP_MODE, (regRead(OP_MODE) & ~MASK_MODE) | (mode & MASK_MODE))
 
 static volatile uint8_t irqFlags1;
 static volatile uint8_t irqFlags2;
@@ -116,4 +116,29 @@
     printString("PacketSent\r\n");
     
     set_mode(MODE_SLEEP);
-} 
\ No newline at end of file
+}
+
+size_t sendString(char *payload) {
+    size_t len = fmin(strlen(payload), 64);
+    
+    regWrite(PCK_CFG1, (regRead(PCK_CFG1) | 0x80) & ~0x10);
+    regWrite(FIFO_THRESH, regRead(FIFO_THRESH) | 0x80);
+    
+    spiSel();
+    transmit(FIFO);
+    transmit(len);
+    for (size_t i = 0; i < len; i++) {
+        transmit(payload[i]);
+    }
+    spiDes();
+    
+    printString("Sending payload...\r\n");    
+    set_mode(MODE_TX);
+    
+    loop_until_bit_is_set(irqFlags2, 3);
+    printString("PacketSent\r\n");
+    
+    set_mode(MODE_SLEEP);
+    
+    return len;
+}
\ No newline at end of file
diff --git a/rfm69.h b/rfm69.h
index 719d47d..a88323f 100644
--- a/rfm69.h
+++ b/rfm69.h
@@ -8,6 +8,8 @@
 #ifndef RFM69_H
 #define RFM69_H
 
+#include <stdbool.h>
+#include <math.h>
 #include <util/delay.h>
 
 #include "rfm69.h"
@@ -53,7 +55,16 @@
 /**
  * Transmits one byte and prints some info.
  */
-void sendByte(uint8_t byte);
+void sendByte(uint8_t payload);
+
+/**
+ * Transmits up to 64 characters of the given string, excluding the
+ * terminal '\\0' character. 
+ * 
+ * @param payload string to be sent
+ * @return characters sent
+ */
+size_t sendString(char *payload);
 
 #endif /* RFM69_H */