diff --git a/src/main.c b/src/main.c
index eb93056..39fe9fc 100644
--- a/src/main.c
+++ b/src/main.c
@@ -25,7 +25,7 @@
 #define CLK_SYS_HZ (320 * MHZ)
 
 #define RX_PIN 10
-#define FB_PIN 11
+#define FB_PIN 6
 #define PSU_PIN 23
 
 #define PIO pio0
@@ -56,7 +56,7 @@ static int frequency = INIT_FREQ;
 static int sample_rate = INIT_SAMPLE_RATE;
 
 #define BASE_GAIN (1 << 15)
-#define ATTN_BITS 10
+#define ATTN_BITS 12
 #define DECIMATE 4
 
 static int gain = BASE_GAIN / (CLK_SYS_HZ / INIT_SAMPLE_RATE);