diff --git a/avrrfm.c b/avrrfm.c
index 3fb3b7a..c8437e1 100644
--- a/avrrfm.c
+++ b/avrrfm.c
@@ -36,7 +36,7 @@
 #include "unifont.h"
 
 #define TRANSMIT_FAST   1  // 4 ~ 32 seconds
-#define TRANSMIT_SLOW   9 // 38 ~ 5 minutes
+#define TRANSMIT_SLOW   9  // 38 ~ 5 minutes
 #define MAX_TIMEOUTS    9  // slow down tx attempts after so many timeouts
 
 #define LABEL_OFFSET    10
@@ -63,6 +63,9 @@
 static y_t yo = 0;
 static width_t width = 0;
 
+/* Averaged output power requested from transmitter */
+static int8_t power = DBM_MAX;
+
 /**
  * Wakes up the controller and increments the watchdog bark counter.
  */
@@ -203,11 +206,12 @@
     int16_t tempx10 = convertTSens(temp->raw);
     div_t tdiv = div(tempx10, 10);
 
-    char buf[42];
-
     // display some info (receiver RSSI + CRC, transmitter output power)
-    snprintf(buf, sizeof (buf), "RSSI: %4d dBm, CRC: %d, PA: %+3d dBm",
-            -_rssi, crc, temp->power);
+    char paf[5];
+    char buf[42];
+    snprintf(paf, sizeof (paf), "%+3d", temp->power);
+    snprintf(buf, sizeof (buf), "RSSI: %4d dBm, CRC: %d, PA: %s dBm",
+            -_rssi, crc, crc ? paf : "---");
     const __flash Font *unifont = &unifontFont;
     writeString(0, 0, unifont, buf, BLACK, WHITE);
 
@@ -267,10 +271,10 @@
     uint8_t response[1];
     int8_t len = rfmReceivePayload(response, sizeof (response), true);
     if (len > 0) {
-        // request more output power starting from -95 dBm
-        // TODO needs some hysteresis/something more elaborate
+        // set more output power starting from -95 dBm
         int8_t rssi = divRoundNearest(response[0], 2);
-        rfmSetOutputPower(rssi - 97);
+        power = divRoundNearest(power + rssi - 97, 2);
+        rfmSetOutputPower(min(max(power, DBM_MIN), DBM_MAX));
 
         return false;
     }
diff --git a/librfm.a b/librfm.a
index 15715ed..c0c50de 100644
--- a/librfm.a
+++ b/librfm.a
Binary files differ
diff --git a/librfm.h b/librfm.h
index f8d598f..f921684 100644
--- a/librfm.h
+++ b/librfm.h
@@ -69,9 +69,11 @@
 #define MODE_TX     0x0c
 #define MODE_RX     0x10
 
-#define PA_OFF      18
+#define DBM_MIN     -2
+#define DBM_MAX     13
 #define PA_MIN      16
 #define PA_MAX      31
+#define PA_OFF      18
 
 #define MESSAGE_SIZE    63
 #define F_STEP          6103515625ULL
diff --git a/usart.c b/usart.c
index 93cb8d9..6c6571a 100644
--- a/usart.c
+++ b/usart.c
@@ -33,7 +33,7 @@
 
     UCSR0B = (1 << TXEN0) | (1 << RXEN0);
     UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
-    
+
     // enable USART RX complete interrupt 0
     UCSR0B |= (1 << RXCIE0);
 }
@@ -60,8 +60,8 @@
     }
 }
 
-void printUint(uint8_t data) {
-    char buf[6];
+void printInt(int8_t data) {
+    char buf[7];
     snprintf(buf, sizeof (buf), "%d\r\n", data);
     printString(buf);
 }
diff --git a/usart.h b/usart.h
index d533251..1ae4cd3 100644
--- a/usart.h
+++ b/usart.h
@@ -46,9 +46,9 @@
 void printString(const char *data);
 
 /**
- * Prints the given unsigned integer including CR + LF via USART.
+ * Prints the given integer including CR + LF via USART.
  */
-void printUint(uint8_t data);
+void printInt(int8_t data);
 
 /**
  * Prints the given unsigned integer in hex notation including CR + LF