# Issues using "Correlata and Sync" block, inside Hier\_block2

**URL:** <https://www.ruby-forum.com/t/issues-using-correlata-and-sync-block-inside-hier-block2/242376>\
**Category:** GNU Radio\
**Created:** [June 19, 2015, 3:26pm UTC](https://www.ruby-forum.com/t/issues-using-correlata-and-sync-block-inside-hier-block2/242376 "2015-06-19T15:26:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [June 19, 2015, 3:26pm UTC](https://www.ruby-forum.com/t/issues-using-correlata-and-sync-block-inside-hier-block2/242376/1 "2015-06-19T15:26:24Z")

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Hi everybody,

I am writing here because I am experiencing an issue (for some weeks  
now),  
and I can’t fixed it! I did some research about this problem, but I  
found  
nothing!

I want to develop a hierarchical block, (called “RX\_PATH”). In this  
block,  
I want to use the “Correlate and Sync” block… And here is my problem!  
When I compile my module (using make), all work well. But, when I run my  
.grc model in GNURadio-Companion, it’s like the “Correlate and Sync”  
block  
freeze.

Actually, no samples are outputted (neither in “out” port nor in “corr”  
port). I don’t understand why, because when I use the “correlate and  
sync”  
block outside my hier\_block, it work fine!

I think, this is a misunderstood of how to use these type of blocks, so  
if  
someone could explain to me where is my mistake, I would be very  
grateful!

Thanks in advance!

Marius

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**Author:** ![mariusc](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ee7513/32.png) [@mariusc](https://www.ruby-forum.com/u/mariusc)\
**Post date:** [June 22, 2015, 2:31pm UTC](https://www.ruby-forum.com/t/issues-using-correlata-and-sync-block-inside-hier-block2/242376/2 "2015-06-22T14:31:14Z")

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On Fri, Jun 19, 2015 at 9:25 AM, Marius Cachelin  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> freeze.  
> Marius

That definitely sounds like unexpected behavior, and I can’t think of  
much  
to say right now about what might be going on.

However, we are deprecating that correlate\_and\_sync block in favor of  
the  
corr\_est block. There are a number of improvements in corr\_est, and  
something in the scheduling might work better for you because of that.

Tom