diff --git a/README.md b/README.md
index e0be4da..6ad8139 100644
--- a/README.md
+++ b/README.md
@@ -2,5 +2,4 @@
 
 Experimental project to drive an RFM69 radio module with plain avr-libc.  
 
-Initializes the module and reads out register RegOpMode (0x01).
-That's all for now. 
+This is work in progress.  
diff --git a/avrrfm.c b/avrrfm.c
index 3b5d0c4..39f210a 100644
--- a/avrrfm.c
+++ b/avrrfm.c
@@ -89,7 +89,8 @@
     initSPI();
     initI2C();
     initRadioInt();
-    initRadio();
+    
+    initRadio(868600);
 
     // enable global interrupts
     sei();
diff --git a/rfm69.c b/rfm69.c
index 01cb472..310ab5b 100644
--- a/rfm69.c
+++ b/rfm69.c
@@ -49,14 +49,24 @@
     return value;
 }
 
-void initRadio(void) {
-    // wait a bit after POR
+void initRadio(uint32_t kHz) {
+    // wait a bit after power on
     _delay_ms(10);
     
     // pull reset LOW to turn on the module
     PORT_RFM &= ~(1 << PIN_RRST);
     
-    _delay_ms(5);    
+    _delay_ms(5);
+    
+    setFreq(kHz);
+}
+
+void setFreq(uint32_t kHz) {
+    kHz = kHz * 1000 / 61;
+    
+    regWrite(FRF_MSB, kHz >> 16);
+    regWrite(FRF_MID, kHz >> 8);
+    regWrite(FRF_LSB, kHz >> 0);
 }
 
 void doStuff(void) {
diff --git a/rfm69.h b/rfm69.h
index 9570d7a..6738cff 100644
--- a/rfm69.h
+++ b/rfm69.h
@@ -15,15 +15,26 @@
 #include "spi.h"
 #include "usart.h"
 
-#define FIFO      0x00
-#define OP_MODE   0x01
+#define FIFO        0x00
+#define OP_MODE     0x01
 
-#define NODE_ADDR 0x39
+#define FRF_MSB     0x07
+#define FRF_MID     0x08
+#define FRF_LSB     0x09
+
+#define NODE_ADDR   0x39
 
 /**
- * Initializes the radio module.
+ * Initializes the radio module with the given carrier frequency in kilohertz.
  */
-void initRadio(void);
+void initRadio(uint32_t kHz);
+
+/**
+ * Sets the carrier frequency in kilohertz.
+ * 
+ * @param kHz
+ */
+void setFreq(uint32_t kHz);
 
 /**
  * Do super useful stuff.