diff --git a/impl/src/sdr/sdr.c b/impl/src/sdr/sdr.c
index b896d57..949a511 100644
--- a/impl/src/sdr/sdr.c
+++ b/impl/src/sdr/sdr.c
@@ -253,7 +253,7 @@ result_t sdr_start_tx(sdr_ctx_t *ctx, size_t burst_size)
 
 	int result;
 
-	result = hackrf_set_freq(ctx->hackrf, SDR_TX_FREQ);
+	result = hackrf_set_freq(ctx->hackrf, SDR_TX_FREQ - SDR_TX_IF_SHIFT);
 	CHECK_HACKRF_RESULT(result, "hackrf_set_freq");
 
 	result = hackrf_set_sample_rate(ctx->hackrf, SDR_TX_SAMPLING_RATE);