# Re: Polyphase Filer examples and Busport Implementation for QT GUI Frequency Sink

**URL:** <https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234142>\
**Category:** GNU Radio\
**Created:** [February 9, 2015, 7:01pm UTC](https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234142 "2015-02-09T19:01:03Z")\
**Posts on this page:** 2\
**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:** [February 9, 2015, 7:01pm UTC](https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234142/1 "2015-02-09T19:01:03Z")

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Thanks for the feedback,

I’m thinking that this means that in their current state, the QT GUI  
Frequency Sinks do not properly support BusPorts …

If I’ve got this wrong is there some documentation somewhere specific to  
these blocks related to Busports that I could refer to … I’ve found  
the  
generic Busports stuff already …

Thanks again,  
LVDJ

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**Author:** ![larryj](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e480ec/32.png) [@larryj](https://www.ruby-forum.com/u/larryj)\
**Post date:** [February 9, 2015, 7:58pm UTC](https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234142/2 "2015-02-09T19:58:41Z")

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On Mon, Feb 9, 2015 at 12:59 PM, Larry Van Der J. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> Thanks for the feedback,
> 
> I’m thinking that this means that in their current state, the QT GUI  
> Frequency Sinks do not properly support BusPorts …

Nope. Just means that there was a bug somewhere along the way that  
caused a  
problem connecting the flowgraph up. It’s a weird one, but not specific  
to  
the QTGUI Frequency Sink.

> If I’ve got this wrong is there some documentation somewhere specific to  
> these blocks related to Busports that I could refer to … I’ve found the  
> generic Busports stuff already …
> 
> Thanks again,  
> LVDJ

There’s nothing that is (or at least should be) specific to any block  
with  
busports over any other block.

Tom