# Adding Single Preamble Question

**URL:** <https://www.ruby-forum.com/t/adding-single-preamble-question/242385>\
**Category:** GNU Radio\
**Created:** [June 19, 2015, 8:34pm UTC](https://www.ruby-forum.com/t/adding-single-preamble-question/242385 "2015-06-19T20:34:53Z")\
**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, 8:34pm UTC](https://www.ruby-forum.com/t/adding-single-preamble-question/242385/1 "2015-06-19T20:34:53Z")

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Hello all,

I am familiar with the stream mux and tagged stream mux blocks. What I  
need  
to do, however, is add a preamble to a stream of data only one time when  
the radio first starts, and then never again while it runs.

Is there a clever way to do this using built in blocks?

v/r,  
Rich