# Post\_guard and pre\_guard in Pecog implementation

**URL:** <https://www.ruby-forum.com/t/post-guard-and-pre-guard-in-pecog-implementation/230270>\
**Category:** GNU Radio\
**Created:** [June 7, 2014, 5:15pm UTC](https://www.ruby-forum.com/t/post-guard-and-pre-guard-in-pecog-implementation/230270 "2014-06-07T17:15:51Z")\
**Posts on this page:** 2\
**Page:** 1

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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:** [June 7, 2014, 5:15pm UTC](https://www.ruby-forum.com/t/post-guard-and-pre-guard-in-pecog-implementation/230270/1 "2014-06-07T17:15:51Z")

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I was revisiting my previous work on FHSS based CR test bed setup  
designed  
using GRAS.

1. I could not appreciably acknowledge the use of post\_gurad and  
pre\_guard  
in FHSS implementation of Pre-Cog.  
Could some one explain?

I guess it would be for tuning/ stabilization time!

1. Has FHSS been implemented using new Messaging API of GRAS, as earlier  
implementation using gr-extras?

2. Has there been new additions/ projects to GRAS? I read past few  
months  
mail list archive. I was surprised to see there has been hardly any  
reference to this beautiful feature!

Jay Prakash

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**Author:** ![Jay\_Prakash](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/3bc359/32.png) [@Jay\_Prakash](https://www.ruby-forum.com/u/Jay_Prakash)\
**Post date:** [June 10, 2014, 3:57am UTC](https://www.ruby-forum.com/t/post-guard-and-pre-guard-in-pecog-implementation/230270/2 "2014-06-10T03:57:44Z")

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You may check here

> **[History](https://github.com/guruofquality/gras/wiki/History)**
>
> GRAS: The GNU Radio Advanced Scheduler. Contribute to guruofquality/gras development by creating an account on GitHub.

On Sun, Jun 8, 2014 at 1:14 AM, Jay Prakash  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)