diff --git a/common.py b/common.py
index 12dc6eb..c321341 100644
--- a/common.py
+++ b/common.py
@@ -8,7 +8,7 @@ log = logging.getLogger(__name__)
 Fs = 32e3
 Ts = 1.0 / Fs
 
-frequencies = (1 + np.arange(8)) * 1e3
+frequencies = (1 + np.arange(9)) * 1e3
 carrier_index = 0
 Fc = frequencies[carrier_index]
 Tc = 1.0 / Fc