# Plotting signal strength

**URL:** <https://www.ruby-forum.com/t/plotting-signal-strength/231353>\
**Category:** GNU Radio\
**Created:** [August 4, 2014, 5:20pm UTC](https://www.ruby-forum.com/t/plotting-signal-strength/231353 "2014-08-04T17:20:35Z")\
**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 4, 2014, 5:20pm UTC](https://www.ruby-forum.com/t/plotting-signal-strength/231353/1 "2014-08-04T17:20:35Z")

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Hi!

I’m trying to plot singnal strength (like s-meter) on the Scope sink  
from a file recorded by rtl\_sdr. And I’m not getting what I expect,  
it’s either frequency is off or what is being plotted doesn’t correlate  
with what I see on waterfall. I’m using frequency xlating filter  
to shift frequency -\> low pass filter -\> rational resempler -\> complex  
to mag^2. Grc is included.