# Ctrl Input Sample and Hold

**URL:** <https://www.ruby-forum.com/t/ctrl-input-sample-and-hold/242378>\
**Category:** GNU Radio\
**Created:** [June 19, 2015, 4:06pm UTC](https://www.ruby-forum.com/t/ctrl-input-sample-and-hold/242378 "2015-06-19T16:06:01Z")\
**Posts on this page:** 1\
**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, 4:06pm UTC](https://www.ruby-forum.com/t/ctrl-input-sample-and-hold/242378/1 "2015-06-19T16:06:01Z")

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Hello, guys. What’s up?

I’m having some troubles using Sample and Hold block in GNUradio. The  
Ctrl Input seems like a “Byte” Input but I don’t know how to control it  
and which kind of block I have to use.

Have anyone already passed through the same problem? How to solve it,  
please?

Thanks a lot.