diff --git a/afsk/main.c.bk b/afsk/main.c.bk
deleted file mode 100644
index a85269dc..00000000
--- a/afsk/main.c.bk
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- *  A sample application transmitting AFSK at 1200 baud
- *
- *  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"
-
-ax5043_conf_t hax5043;
-ax25_conf_t hax25;
-
-static void init_rf();
-void config_x25();
-void trans_x25();
-
-int main(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
-    const char *str = "\x03\x0fThis is an AX.25 Packet from CubeSatSim!!!";
-
-    /* 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);
-    }
-}
-