# Clock recovery in HRPT receiver

**URL:** <https://www.ruby-forum.com/t/clock-recovery-in-hrpt-receiver/240298>\
**Category:** GNU Radio\
**Created:** [April 7, 2014, 3:42pm UTC](https://www.ruby-forum.com/t/clock-recovery-in-hrpt-receiver/240298 "2014-04-07T15:42:10Z")\
**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:** [April 7, 2014, 3:42pm UTC](https://www.ruby-forum.com/t/clock-recovery-in-hrpt-receiver/240298/1 "2014-04-07T15:42:10Z")

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Hi,

I am checking the HRPT receiver available in gr-noaa repository and I  
don’t  
understand the parameters of the Clock Recovery block with the  
information  
available about the HRPT format. I roughly know how that block works,  
but Ineedmore information.

Thank you in advance.

Pablo F…

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<div class="post-metadata">

**Author:** ![pablo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/ad7895/32.png) [@pablo](https://www.ruby-forum.com/u/pablo)\
**Post date:** [April 7, 2014, 4:57pm UTC](https://www.ruby-forum.com/t/clock-recovery-in-hrpt-receiver/240298/2 "2014-04-07T16:57:30Z")

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On Mon, Apr 7, 2014 at 9:41 AM, Pablo F. Alonso \<  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)\> wrote:

> Hi,
> 
> I am checking the HRPT receiver available in gr-noaa repository and I don’t  
> understand the parameters of the Clock Recovery block with the  
> information available about the HRPT format. I roughly know how that blockworks,  
> butIneedmore information.
> 
> Thank you in advance.
> 
> Pablo F..

Pablo,

This will give you a reference to the paper for the block’s  
implementation:

> **[GNU Radio Manual and C++ API Reference: gr::digital::clock\_recovery\_mm\_ff...](https://www.gnuradio.org/doc/doxygen/classgr_1_1digital_1_1clock __recovery__ mm__ff.html)**

Tom