diff --git a/src/cyclic.cpp b/src/cyclic.cpp
index b4e6e9ff..4b921e5a 100644
--- a/src/cyclic.cpp
+++ b/src/cyclic.cpp
@@ -61,8 +61,8 @@ void doHousekeeping() {
            uxTaskGetStackHighWaterMark(BmeTask), eTaskGetState(BmeTask));
 #endif
 #ifdef HAS_DCF77
-  ESP_LOGD(TAG, "DCF77loop %d bytes left | Taskstate = %d",
-           uxTaskGetStackHighWaterMark(DCF77Task), eTaskGetState(DCF77Task));
+  ESP_LOGD(TAG, "Clockloop %d bytes left | Taskstate = %d",
+           uxTaskGetStackHighWaterMark(ClockTask), eTaskGetState(ClockTask));
 #endif
 
 #if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
diff --git a/src/dcf77.cpp b/src/dcf77.cpp
index 8cc2313c..0648d854 100644
--- a/src/dcf77.cpp
+++ b/src/dcf77.cpp
@@ -9,7 +9,7 @@ https://www-user.tu-chemnitz.de/~heha/viewzip.cgi/hs/Funkuhr.zip/
 #ifdef HAS_DCF77
 
 #ifdef IF_482
-#error  "You must define at most one of IF482 or DCF_77"
+#error "You must define at most one of IF482 or DCF77"
 #endif
 
 #include "dcf77.h"
@@ -19,8 +19,9 @@ static const char TAG[] = "main";
 
 #define DCF77_FRAME_SIZE (60)
 #define DCF77_PULSE_DURATION (100)
-#ifdef RTC_CLK
-#define PPS (RTC_CLK / DCF77_PULSE_DURATION)
+
+#if defined RTC_INT && defined RTC_CLK
+#define PPS RTC_CLK
 #else
 #define PPS DCF77_PULSE_DURATION
 #endif
@@ -63,10 +64,14 @@ void DCF_Out(uint8_t startOffset) {
 #endif
 
   if (!BitsPending) {
-    // prepare frame to send for next minute
-    generateTimeframe(now() + DCF77_FRAME_SIZE + 1);
-    // start blinking symbol on display and kick off timer
-    BitsPending = true;
+    // do we have confident time/date?
+    if ((timeStatus() == timeSet) || (timeStatus() == timeNeedsSync)) {
+      // prepare frame to send for next minute
+      generateTimeframe(now() + DCF77_FRAME_SIZE + 1);
+      // start blinking symbol on display and kick off timer
+      BitsPending = true;
+    } else
+      return;
   }
 
   // ticker out current DCF frame
@@ -124,11 +129,14 @@ void dcf77_loop(void *pvParameters) {
 
 #if (PPS == DCF77_PULSE_DURATION) // we don't need clock rescaling
     DCF_Out(0);
-#else // we need clock rescaling by software timer
-    for (uint8_t i = 1; i <= PPS; i++) {
+#elif (PPS > DCF77_PULSE_DURATION) // we need upclocking
+    for (uint8_t i = 1; i <= PPS / DCF77_PULSE_DURATION; i++) {
       DCF_Out(0);
       vTaskDelayUntil(&wakeTime, pdMS_TO_TICKS(DCF77_PULSE_DURATION));
     }
+#elif (PPS < DCF77_PULSE_DURATION) // we need downclocking
+    vTaskDelayUntil(&wakeTime, pdMS_TO_TICKS(DCF77_PULSE_DURATION - PPS));
+    DCF_Out(0);
 #endif
   } // for
 } // dcf77_loop()
diff --git a/src/if482.cpp b/src/if482.cpp
index 41ac2834..71df7a56 100644
--- a/src/if482.cpp
+++ b/src/if482.cpp
@@ -80,7 +80,7 @@ not evaluated by model BU-190
 #ifdef HAS_IF482
 
 #ifdef HAS_DCF77
-#error "You must define at most one of IF482 or DCF_77"
+#error "You must define at most one of IF482 or DCF77"
 #endif
 
 #include "if482.h"
@@ -90,8 +90,9 @@ static const char TAG[] = "main";
 
 #define IF482_FRAME_SIZE (17)
 #define IF482_PULSE_DURATION (1000)
+
 #ifdef RTC_CLK
-#define PPS (RTC_CLK / IF482_PULSE_DURATION)
+#define PPS RTC_CLK
 #else
 #define PPS IF482_PULSE_DURATION
 #endif
@@ -174,14 +175,20 @@ void if482_loop(void *pvParameters) {
         &wakeTime,      // receives moment of call from isr
         portMAX_DELAY); // wait forever (missing error handling here...)
 
-#if (PPS == DCF77_PULSE_DURATION) // we don't need clock rescaling
+#if (PPS == IF482_PULSE_DURATION) // we don't need clock rescaling
     // wait until it's time to start transmit telegram for next second
     vTaskDelayUntil(&wakeTime, shotTime); // sets waketime to moment of shot
     IF482.print(IF482_Out(now() + 1));
-#else // we need clock rescaling by software timer
-    /*
-    not yet implemented for IF482
-    */
+#elif (PPS > IF482_PULSE_DURATION) // we need upclocking
+    for (uint8_t i = 1; i <= PPS / IF482_PULSE_DURATION; i++) {
+      vTaskDelayUntil(&wakeTime, shotTime); // sets waketime to moment of shot
+      IF482.print(IF482_Out(now() + 1));
+    }
+#elif (PPS < IF482_PULSE_DURATION) // we need downclocking
+    IF482.print(IF482_Out(now() + 1));
+    vTaskDelayUntil(&wakeTime,
+                    shotTime - PPS); // sets waketime to moment of shot
+
 #endif
   }
 } // if482_loop()
diff --git a/src/rtctime.cpp b/src/rtctime.cpp
index 5c08af77..de909866 100644
--- a/src/rtctime.cpp
+++ b/src/rtctime.cpp
@@ -102,9 +102,9 @@ float get_rtctemp(void) {
 
 #endif // HAS_RTC
 
-int pps_init(uint32_t clk_freq_Hz) {
+int pps_init(uint32_t clk_freq_ms) {
 // use fixed pulse clock as time base
-#if defined RTC_INT && (RTC_CLK == clk_freq_Hz)
+#if defined RTC_INT && defined RTC_CLK
 
   // setup external interupt for active low RTC INT pin
   pinMode(RTC_INT, INPUT_PULLUP);
@@ -123,11 +123,11 @@ int pps_init(uint32_t clk_freq_Hz) {
 
 #else
   // use clock with adjustable frequency
-  if (clk_freq_Hz) {
+  if (clk_freq_ms) {
     ESP_LOGI(TAG, "Time base ESP32 clock");
-    clockCycle = timerBegin(1, 8000, true); // set 80 MHz prescaler
+    clockCycle = timerBegin(1, 8000, true); // set 80 MHz prescaler to 1/10000 sec
     timerAttachInterrupt(clockCycle, &CLOCKIRQ, true);
-    timerAlarmWrite(clockCycle, 100 * clk_freq_Hz, true);
+    timerAlarmWrite(clockCycle, 10 * clk_freq_ms, true); //ms
   } else {
     ESP_LOGE(TAG, "Invalid pulse clock frequency");
     return 0; // failure