# How to build an HRPT receiver with USRPB100

**URL:** <https://www.ruby-forum.com/t/how-to-build-an-hrpt-receiver-with-usrpb100/240163>\
**Category:** GNU Radio\
**Created:** [March 31, 2014, 4:53pm UTC](https://www.ruby-forum.com/t/how-to-build-an-hrpt-receiver-with-usrpb100/240163 "2014-03-31T16:53:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [March 31, 2014, 4:53pm UTC](https://www.ruby-forum.com/t/how-to-build-an-hrpt-receiver-with-usrpb100/240163/1 "2014-03-31T16:53:45Z")

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Hello,

I’ve searched some information about HRPT format. I know the modulation  
that is used and the frame format, but I have no idea how to built it  
using  
GNU radio. Furthermore, I checked the gr-noaa repository but it hardly  
appears information about the different block used for HRPT demodulation  
and decoding (HRPT PLL, deframer…) There are a lot of parameters whose  
function or purpose is unknown for me. Please I need some help.

Thank you in advance

Pablo F.