diff --git a/afsk/send_afsk.c b/afsk/send_afsk.c
index b436323c..6e947ec3 100644
--- a/afsk/send_afsk.c
+++ b/afsk/send_afsk.c
@@ -1,10 +1,93 @@
+/*
+ *  A sample application transmitting 1k2 AFSK in X.25 format
+ *
+ *  Portions Copyright (C) 2018 Jonathan Brandenburg
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 
+#include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include "status.h"
+#include "ax5043.h"
+#include "ax25.h"
+#include "spi/ax5043spi.h"
 
-void send_afsk() {
+ax5043_conf_t hax5043;
+ax25_conf_t hax25;
 
-printf("Sending AFSK TLM! \n");
+static void init_rf();
+void config_x25();
+void trans_x25();
 
+int send_afsk(void) {
+    setSpiChannel(SPI_CHANNEL);
+    setSpiSpeed(SPI_SPEED);
+    initializeSpi();
+
+    int ret;
+    uint8_t data[1024];
+    // 0x03 is a UI frame
+    // 0x0F is no Level 3 protocol
+    // rest is dummy CubeSatSim telemetry in AO-7 format 	
+    const char *str = "\x03\x0fhi hi 101 102 103 104 202 203 204 205 303 304 305 306 404 405 406 407 408 505 506 507 508 606 607 608 609\n";
+
+    /* Infinite loop */
+    for (;;) {
+        sleep(2);
+    	
+	// send X.25 packet
+
+    	init_rf();
+
+    	ax25_init(&hax25, (uint8_t *) "CQ", '2', (uint8_t *) "DX", '2',
+    		AX25_PREAMBLE_LEN,
+   		 AX25_POSTAMBLE_LEN);
+
+        
+	printf("INFO: Transmitting X.25 packet\n");
+
+        memcpy(data, str, strnlen(str, 256));
+        ret = ax25_tx_frame(&hax25, &hax5043, data, strnlen(str, 256));
+        if (ret) {
+            fprintf(stderr,
+                    "ERROR: Failed to transmit AX.25 frame with error code %d\n",
+                    ret);
+            exit(EXIT_FAILURE);
+        }
+        ax5043_wait_for_transmit();
+        if (ret) {
+            fprintf(stderr,
+                    "ERROR: Failed to transmit entire AX.25 frame with error code %d\n",
+                    ret);
+            exit(EXIT_FAILURE);
+        }
+
+    }
+
+    return 0;
 }
 
+static void init_rf() {
+    int ret;
+    ret = ax5043_init(&hax5043, XTAL_FREQ_HZ, VCO_INTERNAL);
+    if (ret != PQWS_SUCCESS) {
+        fprintf(stderr,
+                "ERROR: Failed to initialize AX5043 with error code %d\n", ret);
+        exit(EXIT_FAILURE);
+    }
+}