# QT GUI time sink

**URL:** <https://www.ruby-forum.com/t/qt-gui-time-sink/231008>\
**Category:** GNU Radio\
**Created:** [July 17, 2014, 7:50am UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008 "2014-07-17T07:50:47Z")\
**Posts on this page:** 6\
**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 17, 2014, 7:50am UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008/1 "2014-07-17T07:50:47Z")

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Hi all,  
When a complex signal is given to QT time sink block it displays the  
signal in blue color.There is a red line also at zero level.is this  
the DC component??And it doesn’t display the imaginary part as in WX  
Scope sink block?  
Regards,  
Ali

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [July 17, 2014, 9:45am UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008/2 "2014-07-17T09:45:07Z")

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Hi Ali,  
There should be a legend on the right of the plot [1].  
Your second line _is_ the imaginary part.

Greetings,  
Marcus  
[1] [http://i.imgur.com/kfXiRsX.png](http://i.imgur.com/kfXiRsX.png)

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [July 17, 2014, 10:20am UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008/3 "2014-07-17T10:20:31Z")

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Hi Marcus,  
The legend only says 'Data 0’and ‘Data 1’.However, it can be  
changed.Why is the imaginary part zero?

On Thu, Jul 17, 2014 at 12:43 PM, Marcus Müller

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [July 17, 2014, 10:24am UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008/4 "2014-07-17T10:24:41Z")

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I don’t know why the signal you’re feeding to your sink has a zero  
imaginary part, since I don’t know that signal.  
That’s something that you’ll have to figure out.

Greetings,  
Marcus

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [July 17, 2014, 2:42pm UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008/5 "2014-07-17T14:42:43Z")

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On Thu, Jul 17, 2014 at 4:23 AM, Marcus Müller  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> I don’t know why the signal you’re feeding to your sink has a zero  
> imaginary part, since I don’t know that signal.  
> That’s something that you’ll have to figure out.
> 
> Greetings,  
> Marcus

Ali,

Agree with Marcus. How are we to know what’s supposed to happen with  
your  
signal.

But yes, the blue is the real part and the red is the imaginary part.  
What  
Marcus showed you was an update to the blocks to label them better as  
Re{}  
and Im{}. You’re just running an older version where the data is simply  
labeled Data 0 (the real part) and Data 1 (the imaginary part).

Tom

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<div class="post-metadata">

**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [July 17, 2014, 5:24pm UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008/6 "2014-07-17T17:24:46Z")

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Thanx Tom!