I have been playing around with the GRC (amazing tool - really love it!) and I was just taking a look at the GMSK Modulator with some random data.
I couldn't get the random data block to work properly, so I used a file source that is just some ascii text. I didn't think this would matter since it's just random data anyway. I have it set to repeat the data once done. I notice there is a discontinuity with the GMSK modulator. I am not sure where it's coming from, or if it's in the Constellation Sink, but I thought I would just bring it up to the list. I have attached the sample.grc.xml file along with the samples.txt ascii file I made. The concern is when the Constellation Sink format is set to "line". I have also attached a picture of the discontinuity I am seeing. Brian
<?xml version='1.0' encoding='UTF-8'?>
<flow_graph>
<timestamp>1171304037.45</timestamp>
<hostname>SC064299</hostname>
<version>0.60</version>
<valid>True</valid>
<window_width>1200</window_width>
<window_height>800</window_height>
<vars>
<var>
<key>samp_rate</key>
<value>28.8e6</value>
<min/>
<max/>
</var>
</vars>
<signal_blocks>
<signal_block>
<tag>About</tag>
<id>About0</id>
<x_coordinate>20</x_coordinate>
<y_coordinate>20</y_coordinate>
<rotation>0</rotation>
<params>
<param>GMSK Example</param>
<param>Brian Padalino</param>
</params>
</signal_block>
<signal_block>
<tag>Note</tag>
<id>Note0</id>
<x_coordinate>20</x_coordinate>
<y_coordinate>100</y_coordinate>
<rotation>0</rotation>
<params>
<param>This is an example of a GMSK modulator generating random data.</param>
</params>
</signal_block>
<signal_block>
<tag>Constellation Sink</tag>
<id>Constellation Sink0</id>
<x_coordinate>538</x_coordinate>
<y_coordinate>30</y_coordinate>
<rotation>0</rotation>
<params>
<param>Constellation</param>
<param>512</param>
<param>$samp_rate</param>
<param>1</param>
<param>0</param>
<param>0.01</param>
<param>0.01</param>
</params>
</signal_block>
<signal_block>
<tag>FFT Sink</tag>
<id>FFT Sink0</id>
<x_coordinate>535</x_coordinate>
<y_coordinate>457</y_coordinate>
<rotation>0</rotation>
<params>
<param>0</param>
<param>FFT</param>
<param>20</param>
<param>20</param>
<param>512</param>
<param>$samp_rate</param>
<param>0</param>
</params>
</signal_block>
<signal_block>
<tag>Complex Components</tag>
<id>Complex Components0</id>
<x_coordinate>532</x_coordinate>
<y_coordinate>225</y_coordinate>
<rotation>0</rotation>
<params>
<param>0</param>
</params>
</signal_block>
<signal_block>
<tag>Scope Sink</tag>
<id>Scope Sink0</id>
<x_coordinate>794</x_coordinate>
<y_coordinate>185</y_coordinate>
<rotation>0</rotation>
<params>
<param>1</param>
<param>Scope</param>
<param>512</param>
<param>$samp_rate</param>
<param>1</param>
<param>0</param>
<param>0.001</param>
</params>
</signal_block>
<signal_block>
<tag>Complex Components</tag>
<id>Complex Components1</id>
<x_coordinate>524</x_coordinate>
<y_coordinate>333</y_coordinate>
<rotation>0</rotation>
<params>
<param>1</param>
</params>
</signal_block>
<signal_block>
<tag>Scope Sink</tag>
<id>Scope Sink1</id>
<x_coordinate>794</x_coordinate>
<y_coordinate>322</y_coordinate>
<rotation>0</rotation>
<params>
<param>1</param>
<param>Scope</param>
<param>512</param>
<param>$samp_rate</param>
<param>1</param>
<param>0</param>
<param>0.001</param>
</params>
</signal_block>
<signal_block>
<tag>File Source</tag>
<id>File Source0</id>
<x_coordinate>21</x_coordinate>
<y_coordinate>291</y_coordinate>
<rotation>0</rotation>
<params>
<param>4</param>
<param>/tmp/samples.txt</param>
<param>0</param>
</params>
</signal_block>
<signal_block>
<tag>GMSK Modulation</tag>
<id>GMSK Modulation0</id>
<x_coordinate>276</x_coordinate>
<y_coordinate>291</y_coordinate>
<rotation>0</rotation>
<params>
<param>24</param>
<param>0.35</param>
</params>
</signal_block>
<signal_block>
<tag>GMSK Demodulation</tag>
<id>GMSK Demodulation0</id>
<x_coordinate>528</x_coordinate>
<y_coordinate>601</y_coordinate>
<rotation>0</rotation>
<params>
<param>2</param>
<param>0.05</param>
<param>0.5</param>
<param>0.005</param>
<param>0</param>
</params>
</signal_block>
<signal_block>
<tag>Char to Float</tag>
<id>Char to Float0</id>
<x_coordinate>788</x_coordinate>
<y_coordinate>631</y_coordinate>
<rotation>0</rotation>
<params/>
</signal_block>
<signal_block>
<tag>Scope Sink</tag>
<id>Scope Sink2</id>
<x_coordinate>998</x_coordinate>
<y_coordinate>592</y_coordinate>
<rotation>0</rotation>
<params>
<param>1</param>
<param>Scope</param>
<param>512</param>
<param>$samp_rate</param>
<param>1</param>
<param>0</param>
<param>0.001</param>
</params>
</signal_block>
</signal_blocks>
<connections>
<connection>
<input_signal_block_id>Complex Components0</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>GMSK Modulation0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>Complex Components1</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>GMSK Modulation0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>Constellation Sink0</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>GMSK Modulation0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>FFT Sink0</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>GMSK Modulation0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>Scope Sink0</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>Complex Components0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>Scope Sink1</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>Complex Components1</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>GMSK Modulation0</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>File Source0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>GMSK Demodulation0</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>GMSK Modulation0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>Char to Float0</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>GMSK Demodulation0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
<connection>
<input_signal_block_id>Scope Sink2</input_signal_block_id>
<input_socket_index>0</input_socket_index>
<output_signal_block_id>Char to Float0</output_signal_block_id>
<output_socket_index>0</output_socket_index>
</connection>
</connections>
</flow_graph>
98345894578994828472389249827
gmsk_constellation.PNG
Description: PNG image
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