# USRP transmitting timestamp

**URL:** <https://www.ruby-forum.com/t/usrp-transmitting-timestamp/242645>\
**Category:** GNU Radio\
**Created:** [July 10, 2015, 7:53pm UTC](https://www.ruby-forum.com/t/usrp-transmitting-timestamp/242645 "2015-07-10T19:53:29Z")\
**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:** [July 10, 2015, 7:53pm UTC](https://www.ruby-forum.com/t/usrp-transmitting-timestamp/242645/1 "2015-07-10T19:53:29Z")

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hi,

I want to transmit a frame from a USRP to another USRP.

I think that is a packed based transmitting.

is there any method to get the transmitting timestamp of USRP sink?

I check the usrp\_sink\_impl.cc.

there is the “\_metadata.time\_spec”, it will update by the num\_sent and  
the samp\_rate.

but if my flow is not continuous…

so that the time is invalid… due to the time not keep updating.

or is there any method about making the frame along with a continuous  
stream?

to make the stream continuous and i can get the valid timestamp.

Thank you so much!!