diff --git a/impl/src/sdr/sdr.c b/impl/src/sdr/sdr.c
index ca0c3f6..67d3c87 100644
--- a/impl/src/sdr/sdr.c
+++ b/impl/src/sdr/sdr.c
@@ -5,6 +5,7 @@
 #include <stdlib.h> //free
 #include <complex.h>
 #include <math.h>
+#include <string.h>
 
 #include "config.h"
 
@@ -32,23 +33,23 @@ result_t sdr_init(sdr_ctx_t *ctx)
 	ctx->tx_stream = NULL;
 	ctx->rx_stream = NULL;
 
-	ctx->interp = firinterp_crcf_create_prototype(LIQUID_FIRFILT_PM, SDR_OVERSAMPLING, 10, 0.2, 0);
-	ctx->decim  = firdecim_crcf_create_prototype(LIQUID_FIRFILT_PM, SDR_OVERSAMPLING, 10, 0.2, 0);
+	ctx->interp = firinterp_crcf_create_kaiser(SDR_OVERSAMPLING, 9, 60.0f);
+	ctx->decim  = firdecim_crcf_create_kaiser(SDR_OVERSAMPLING, 9, 60.0f);
 
 	ctx->tx_nco = nco_crcf_create(LIQUID_NCO);
 	ctx->rx_nco = nco_crcf_create(LIQUID_NCO);
 
-	nco_crcf_set_frequency(ctx->tx_nco, -2 * M_PI * SDR_TX_IF_SHIFT / SDR_TX_SAMPLING_RATE);
-	nco_crcf_set_frequency(ctx->rx_nco, -2 * M_PI * SDR_RX_IF_SHIFT / SDR_TX_SAMPLING_RATE);
+	nco_crcf_set_frequency(ctx->tx_nco, 2 * M_PI * SDR_TX_IF_SHIFT / SDR_TX_SAMPLING_RATE);
+	nco_crcf_set_frequency(ctx->rx_nco, 2 * M_PI * SDR_RX_IF_SHIFT / SDR_RX_SAMPLING_RATE);
 
 	//enumerate devices
 	SoapySDRKwargs *results = SoapySDRDevice_enumerate(NULL, &length);
 	for (size_t i = 0; i < length; i++)
 	{
-		fprintf(stderr, "sdr: Found device #%d: ", (int)i);
+		fprintf(stderr, "sdr: Found device #%d:\n", (int)i);
 		for (size_t j = 0; j < results[i].size; j++)
 		{
-			fprintf(stderr, "sdr: %s=%s, ", results[i].keys[j], results[i].vals[j]);
+			fprintf(stderr, "sdr: - %s=%s\n", results[i].keys[j], results[i].vals[j]);
 		}
 		fprintf(stderr, "sdr: \n");
 	}
@@ -57,6 +58,7 @@ result_t sdr_init(sdr_ctx_t *ctx)
 	//create device instance
 	//args can be user defined or from the enumeration result
 	SoapySDRKwargs args;
+	memset(&args, 0, sizeof(args));
 	SoapySDRKwargs_set(&args, "driver", "hackrf");
 	ctx->sdr = SoapySDRDevice_make(&args);
 	SoapySDRKwargs_clear(&args);
@@ -150,7 +152,7 @@ result_t sdr_start_tx(sdr_ctx_t *ctx)
 	shutdown_streams(ctx);
 
 	//setup a stream (complex floats)
-	ctx->tx_stream = SoapySDRDevice_setupStream(ctx->sdr, SOAPY_SDR_RX, SOAPY_SDR_CF32, NULL, 0, NULL);
+	ctx->tx_stream = SoapySDRDevice_setupStream(ctx->sdr, SOAPY_SDR_TX, SOAPY_SDR_CF32, NULL, 0, NULL);
 
 	if(ctx->tx_stream == NULL) {
 		fprintf(stderr, "sdr: setupStream fail: %s\n", SoapySDRDevice_lastError());
@@ -237,7 +239,7 @@ result_t sdr_baseband_to_rf(sdr_ctx_t *ctx,
 	for(size_t i = 0; i < nbb; i++) {
 		float complex tmp[SDR_OVERSAMPLING];
 
-		firinterp_crcf_execute(ctx->interp, bb_samples[i], tmp);
+		firinterp_crcf_execute(ctx->interp, bb_samples[i] / 2.0f, tmp);
 
 		nco_crcf_mix_block_up(ctx->tx_nco,
 				tmp,