diff --git a/src/zapit/src/frontend.cpp b/src/zapit/src/frontend.cpp
index 2f02bea19..97efef53e 100644
--- a/src/zapit/src/frontend.cpp
+++ b/src/zapit/src/frontend.cpp
@@ -1724,7 +1724,7 @@ uint32_t CFrontend::sendEN50494TuningCommand(const uint32_t frequency, const int
 		}
 		fop(ioctl, FE_SET_VOLTAGE, SEC_VOLTAGE_18);
 		usleep(20 * 1000);		/* en50494 says: >4ms and < 22 ms */
-		sendDiseqcCommand(&cmd, 80);	/* en50494 says: >2ms and < 60 ms */
+		sendDiseqcCommand(&cmd, 120);				/* en50494 says: >2ms and < 60 ms -- it seems we must add the lengthe of telegramm itself (~65ms)*/
 		fop(ioctl, FE_SET_VOLTAGE, unicable_lowvolt);
 	}
 	return ret;
@@ -1761,7 +1761,7 @@ uint32_t CFrontend::sendEN50607TuningCommand(const uint32_t frequency, const int
 				high_band;					/* high_band  == 0x01 */
 			fop(ioctl, FE_SET_VOLTAGE, SEC_VOLTAGE_18);
 			usleep(20 * 1000);					/* en50494 says: >4ms and < 22 ms */
-			sendDiseqcCommand(&cmd, 80);				/* en50494 says: >2ms and < 60 ms */
+			sendDiseqcCommand(&cmd, 120);				/* en50494 says: >2ms and < 60 ms -- it seems we must add the lengthe of telegramm itself (~65ms)*/
 			fop(ioctl, FE_SET_VOLTAGE, unicable_lowvolt);
 		}
 		return ret;