# SNR question **URL:** \ **Category:** GNU Radio\ **Created:** [July 30, 2015, 11:51pm UTC](https://www.ruby-forum.com/t/snr-question/242818 "2015-07-30T23:51:40Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Post date:** [July 30, 2015, 11:51pm UTC](https://www.ruby-forum.com/t/snr-question/242818/1 "2015-07-30T23:51:40Z")
Hi I would want to know if there a way to calculate SNR for a qpsk, 16 QAM and 64 QAM signals. I have been using the “divide” block, which has as inputs, the signal that entries to the channel and a noise source fixed with the voltage of noise that is fixed in the “channel model” block. Then, the “divide” block’s output goes to the “log10” block Would this be correct? I copied this idea from another discussion. [http://gnuradio.4.n7.nabble.com/file/n47229/flowgraph.png](http://gnuradio.4.n7.nabble.com/file/n47229/flowgraph.png) Thank you – View this message in context: [http://gnuradio.4.n7.nabble.com/SNR-question-tp55133.html](http://gnuradio.4.n7.nabble.com/SNR-question-tp55133.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com).