diff --git a/src/libmobile/sender.c b/src/libmobile/sender.c
index 9ec8797..beb1f42 100644
--- a/src/libmobile/sender.c
+++ b/src/libmobile/sender.c
@@ -28,6 +28,9 @@
 #include "../libdebug/debug.h"
 #include "sender.h"
 #include "../libtimer/timer.h"
+#ifdef HAVE_SDR
+#include "../libsdr/sdr_config.h"
+#endif
 
 /* debug time consumption of audio processing */
 //#define DEBUG_TIME_CONSUMPTION
@@ -237,7 +240,7 @@ int sender_open_audio(int buffer_size, double interval)
 	/* in case of initialized spectrum display (SDR), we add all channels.
 	 * if spectrum display was not initialized (sound card), function call is ignored */
 	for (inst = sender_head; inst; inst = inst->next)
-		display_spectrum_add_mark(inst->kanal, inst->empfangsfrequenz);
+		display_spectrum_add_mark(inst->kanal, (sdr_config->swap_links) ? inst->sendefrequenz : inst->empfangsfrequenz);
 #endif
 
 	return 0;
diff --git a/src/libsdr/sdr.c b/src/libsdr/sdr.c
index 17ffa12..5ef8ffb 100644
--- a/src/libsdr/sdr.c
+++ b/src/libsdr/sdr.c
@@ -267,6 +267,15 @@ void *sdr_open(const char __attribute__((__unused__)) *device, double *tx_freque
 		goto error;
 	}
 
+	/* swap links, if required */
+	if (sdr_config->swap_links) {
+		double *temp;
+		PDEBUG(DSDR, DEBUG_NOTICE, "Sapping RX and TX frequencies!\n");
+		temp = rx_frequency;
+		rx_frequency = tx_frequency;
+		tx_frequency = temp;
+	}
+
 	if (tx_frequency) {
 		/* calculate required bandwidth (IQ rate) */
 
@@ -458,14 +467,6 @@ void *sdr_open(const char __attribute__((__unused__)) *device, double *tx_freque
 		}
 	}
 
-	if (sdr_config->swap_links) {
-		double temp;
-		PDEBUG(DSDR, DEBUG_NOTICE, "Sapping RX and TX frequencies!\n");
-		temp = rx_center_frequency;
-		rx_center_frequency = tx_center_frequency;
-		tx_center_frequency = temp;
-	}
-
 	display_iq_init(samplerate);
 	display_spectrum_init(samplerate, rx_center_frequency);