# Signal Source Frequency

**URL:** <https://www.ruby-forum.com/t/signal-source-frequency/234813>\
**Category:** GNU Radio\
**Created:** [July 29, 2014, 10:58pm UTC](https://www.ruby-forum.com/t/signal-source-frequency/234813 "2014-07-29T22:58:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [July 29, 2014, 10:58pm UTC](https://www.ruby-forum.com/t/signal-source-frequency/234813/1 "2014-07-29T22:58:10Z")

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I am new to GNU Radio. I am working through the new tutorials and am  
stuck on a concept. I’ve provided a screen shot of my flow diagram.

If you look at the triangle signal source, this has a frequency of  
100uHz. Yet, when I plot the signal, it is constantly changing at a much  
higher rate then 100uHz. 100uHz period is about 3 hours. The triangle  
wave value is changing much faster then that.

This leads me to believe I’m missing a fundamental concept. Can someone  
explain to me the concept that produces the output you see when running  
this tutorial? Specifically this is tutorial\_two\_7. If you scroll down  
to the bottom of the following link you can find it under the section  
titled “The Singing Sine Wave”:

[http://gnuradio.org/redmine/projects/gnuradio/wiki/NewTutorials2/40](http://gnuradio.org/redmine/projects/gnuradio/wiki/NewTutorials2/40)

Thanks,  
Rich

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**Author:** ![reback](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/b5ac83/32.png) [@reback](https://www.ruby-forum.com/u/reback)\
**Post date:** [August 1, 2014, 9:08pm UTC](https://www.ruby-forum.com/t/signal-source-frequency/234813/2 "2014-08-01T21:08:27Z")

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Is this a difficult question or did I get unlucky with people seeing the  
question?