Fixing bug in setting SNR

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@11523 221aa14e-8319-0410-a670-987f0aec2ac5

diff --git a/gnuradio-examples/python/digital/benchmark_qt_loopback.py b/gnuradio-examples/python/digital/benchmark_qt_loopback.py
index cd77f0748bf64e173babbe48f5d2d225cffd82c8..e43bffa2638561eb429fc6ed658463a1aaaaf552 100755 (executable)
--- a/gnuradio-examples/python/digital/benchmark_qt_loopback.py
+++ b/gnuradio-examples/python/digital/benchmark_qt_loopback.py
@@ -279,7 +279,7 @@ class my_top_block(gr.top_block):
     def get_noise_voltage(self, SNR):
         snr = 10.0**(SNR/10.0)        
         power_in_signal = abs(self._tx_amplitude)**2
-        noise_power = power_in_signal/SNR
+        noise_power = power_in_signal/snr
         noise_voltage = math.sqrt(noise_power)
         return noise_voltage