# Tx\_time tag accuraccy

**URL:** <https://www.ruby-forum.com/t/tx-time-tag-accuraccy/230208>\
**Category:** GNU Radio\
**Created:** [June 4, 2014, 7:15pm UTC](https://www.ruby-forum.com/t/tx-time-tag-accuraccy/230208 "2014-06-04T19:15:22Z")\
**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 4, 2014, 7:15pm UTC](https://www.ruby-forum.com/t/tx-time-tag-accuraccy/230208/1 "2014-06-04T19:15:22Z")

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I am using stream tags for the transmission control. I want to know what  
is  
the accuracy/precision of the tx\_time tag? E.g if I tag a burst A with  
tx\_time=X, then the burst A will come out of the USRP transmit FIFO at  
X+delta, how large the value of delta could be?

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<div class="post-metadata">

**Author:** ![bob\_wole](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b4bc9f/32.png) [@bob\_wole](https://www.ruby-forum.com/u/bob_wole)\
**Post date:** [June 4, 2014, 7:53pm UTC](https://www.ruby-forum.com/t/tx-time-tag-accuraccy/230208/2 "2014-06-04T19:53:06Z")

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