diff --git a/impl/src/config.h b/impl/src/config.h
index c5c6186..a753bb0 100644
--- a/impl/src/config.h
+++ b/impl/src/config.h
@@ -46,4 +46,12 @@
 
 // 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_LNA    0.0f   // 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.
+#define SDR_GAIN_RX_VGA   24.0f   // Baseband variable gain amplifier.
+
 #endif // CONFIG_H
diff --git a/impl/src/sdr/sdr.c b/impl/src/sdr/sdr.c
index 7113b1e..aa1408b 100644
--- a/impl/src/sdr/sdr.c
+++ b/impl/src/sdr/sdr.c
@@ -151,6 +151,23 @@ result_t sdr_start_rx(sdr_ctx_t *ctx)
 		fprintf(stderr, "sdr: activateStream fail: %s\n", SoapySDRDevice_lastError());
 	}
 
+	// set gains
+	if(SoapySDRDevice_setGainElement(ctx->sdr, SOAPY_SDR_RX, 0, "AMP", SDR_GAIN_RX_AMP) != 0) {
+		fprintf(stderr, "sdr: setGainElement fail: %s\n", SoapySDRDevice_lastError());
+		return ERR_SOAPY;
+	}
+
+	if(SoapySDRDevice_setGainElement(ctx->sdr, SOAPY_SDR_RX, 0, "LNA", SDR_GAIN_RX_LNA) != 0) {
+		fprintf(stderr, "sdr: setGainElement fail: %s\n", SoapySDRDevice_lastError());
+		return ERR_SOAPY;
+	}
+
+	if(SoapySDRDevice_setGainElement(ctx->sdr, SOAPY_SDR_RX, 0, "VGA", SDR_GAIN_RX_VGA) != 0) {
+		fprintf(stderr, "sdr: setGainElement fail: %s\n", SoapySDRDevice_lastError());
+		return ERR_SOAPY;
+	}
+
+
 	return OK;
 }
 
@@ -161,6 +178,18 @@ result_t sdr_start_tx(sdr_ctx_t *ctx, size_t burst_size)
 		fprintf(stderr, "sdr: activateStream fail: %s\n", SoapySDRDevice_lastError());
 	}
 
+	// set gain
+	if(SoapySDRDevice_setGainElement(ctx->sdr, SOAPY_SDR_TX, 0, "AMP", SDR_GAIN_TX_AMP) != 0) {
+		fprintf(stderr, "sdr: setGainElement fail: %s\n", SoapySDRDevice_lastError());
+		return ERR_SOAPY;
+	}
+
+	if(SoapySDRDevice_setGainElement(ctx->sdr, SOAPY_SDR_TX, 0, "LNA", SDR_GAIN_TX_LNA) != 0) {
+		fprintf(stderr, "sdr: setGainElement fail: %s\n", SoapySDRDevice_lastError());
+		return ERR_SOAPY;
+	}
+
+
 	return OK;
 }