digital: fixed digital narrowband examples to set the sample rate based on the symbol rate, not the bitrate, of the modulation.

1 files changed, 5 insertions, 1 deletions

diff --git a/gr-digital/examples/narrowband/benchmark_tx.py b/gr-digital/examples/narrowband/benchmark_tx.py
index cc077bb28..25ed355da 100755
--- a/gr-digital/examples/narrowband/benchmark_tx.py
+++ b/gr-digital/examples/narrowband/benchmark_tx.py
@@ -43,7 +43,11 @@ class my_top_block(gr.top_block):
         gr.top_block.__init__(self)
 
         if(options.tx_freq is not None):
-            self.sink = uhd_transmitter(options.args, options.bitrate,
+            # Work-around to get the modulation's bits_per_symbol
+            args = modulator.extract_kwargs_from_options(options)
+            symbol_rate = options.bitrate / modulator(**args).bits_per_symbol()
+
+            self.sink = uhd_transmitter(options.args, symbol_rate,
                                         options.samples_per_symbol,
                                         options.tx_freq, options.tx_gain,
                                         options.antenna, options.verbose)