diff --git a/rfm69.c b/rfm69.c
index 60b2822..17638a5 100644
--- a/rfm69.c
+++ b/rfm69.c
@@ -93,9 +93,9 @@
     // regWrite(BITRATE_MSB, 0x0d);
     // regWrite(BITRATE_LSB, 0x05);
     
-    // RC calibration, must be done in standby mode (default after power on)
-    regWrite(OSC1, 0x80);
-    do { } while (!(regRead(OSC1) & 0x40));
+    // RC calibration, automatically done at device power-up
+    // regWrite(OSC1, 0x80);
+    // do { } while (!(regRead(OSC1) & 0x40));
     
     // PA level (default +13 dBm)
     regWrite(PA_LEVEL, 0x9f);
@@ -115,6 +115,9 @@
     // RX_BW during AFC (default)
     regWrite(AFC_BW, 0x8b);
     
+    // RSSI threshold (default, POR 0xff)
+    regWrite(RSSI_THRESH, 0xe4);
+    
     // Preamble size
     regWrite(PREAMB_MSB, 0x00);
     regWrite(PREAMB_LSB, 0x0f);
diff --git a/rfm69.h b/rfm69.h
index 6313909..82c0cc4 100644
--- a/rfm69.h
+++ b/rfm69.h
@@ -32,6 +32,7 @@
 #define DIO_MAP1    0x25
 #define DIO_MAP2    0x26
 #define IRQ_FLAGS1  0x27
+#define RSSI_THRESH 0x29
 #define PREAMB_MSB  0x2c
 #define PREAMB_LSB  0x2d
 #define IRQ_FLAGS2  0x28