$NetBSD: patch-src_rtl__fm_c,v 1.1 2014/10/13 13:05:36 mef Exp $

rtl_fm picks frequency with some offset. It is supposed to be activated
by (no documented option) -Eoffset. Disable it for default behavior
  -- should be discussed with upstream --

--- ./src/rtl_fm.c
+++ ./src/rtl_fm.c
@@ -792,7 +792,7 @@ static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
 			buf[i] = 127;}
 		s->mute = 0;
 	}
-	if (!s->offset_tuning) {
+	if (s->offset_tuning) {
 		rotate_90(buf, len);}
 	for (i=0; i<(int)len; i++) {
 		s->buf16[i] = (int16_t)buf[i] - 127;}
@@ -864,7 +864,7 @@ static void optimal_settings(int freq, int rate)
 	}
 	capture_freq = freq;
 	capture_rate = dm->downsample * dm->rate_in;
-	if (!d->offset_tuning) {
+	if (d->offset_tuning) {
 		capture_freq = freq + capture_rate/4;}
 	capture_freq += cs->edge * dm->rate_in / 2;
 	dm->output_scale = (1<<15) / (128 * dm->downsample);