diff --git a/impl/src/config.h b/impl/src/config.h
index 59df874..d72ac55 100644
--- a/impl/src/config.h
+++ b/impl/src/config.h
@@ -43,18 +43,18 @@
 
 // actually transmitted or received signal frequencies, NOT the SDR center frequency.
 #define SDR_TX_FREQ       434.100e6f
-#define SDR_RX_FREQ       434.115e6f
+#define SDR_RX_FREQ       434.100e6f
 
 // shift applied in the baseband, to get rid of SDR DC peak. If the value here
 // is not 0, software mixing will be done on the received signal.
-#define SDR_TX_IF_SHIFT     0.000e6f
+#define SDR_TX_IF_SHIFT     0.150e6f
 #define SDR_RX_IF_SHIFT     0.150e6f
 
 // NOTE: the SDR center frequency will be SDR_RX_FREQ - SDR_RX_IF_SHIFT.
 
 // gain configuration
 #define SDR_GAIN_TX_AMP    0.0f   // extra power amplifier. Set to 14.0f to activate.
-#define SDR_GAIN_TX_VGA    0.0f   // normal variable gain amplifier.
+#define SDR_GAIN_TX_VGA   16.0f   // normal variable gain amplifier.
 
 #define SDR_GAIN_RX_AMP    0.0f   // extra input amplifier. Set to 14.0f to activate.
 #define SDR_GAIN_RX_LNA   30.0f   // RF variable gain amplifier.