# \-ve amplitude value in wx fft sink spectrum

**URL:** <https://www.ruby-forum.com/t/ve-amplitude-value-in-wx-fft-sink-spectrum/244555>\
**Category:** GNU Radio\
**Created:** [May 3, 2016, 7:02am UTC](https://www.ruby-forum.com/t/ve-amplitude-value-in-wx-fft-sink-spectrum/244555 "2016-05-03T07:02:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [May 3, 2016, 7:02am UTC](https://www.ruby-forum.com/t/ve-amplitude-value-in-wx-fft-sink-spectrum/244555/1 "2016-05-03T07:02:43Z")

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Respected members  
I am new in GNU radio and i just want to share about one problem i came  
across related to the WX FFT SINK spectrum i.e. how can i get +ve  
amplitude  
values of the fft spectrum(signal amplitude)? The values i got were  
always -ve (the spectrum is shown below the 0 db amplitude)whatever the  
flow grapths were. This question might had been discussed earlier but  
anyone plz suggest me what can be the solution. Which parameter should i  
need to change?

regards  
pitter