# Qam modulation -

**URL:** <https://www.ruby-forum.com/t/qam-modulation/231578>\
**Category:** GNU Radio\
**Created:** [August 16, 2014, 6:20pm UTC](https://www.ruby-forum.com/t/qam-modulation/231578 "2014-08-16T18:20:56Z")\
**Posts on this page:** 1\
**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:** [August 16, 2014, 6:20pm UTC](https://www.ruby-forum.com/t/qam-modulation/231578/1 "2014-08-16T18:20:56Z")

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Hi all,

I’m trying to make a qam modulation where you can choose different ways  
to constellation using constellation\_calcdist, and that part works fine  
(within limitations), but at runtime some blocks do not take the changes  
made by block QT GUI Chooser, for example, block packet\_encoder and  
others.

Are any has happened this ?, or any knows why that happens?

Thanks 🙂

Andrés Gómez  
Electronic engineering student