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Re: [Discuss-gnuradio] UHD stream tagging

From: Tim
Subject: Re: [Discuss-gnuradio] UHD stream tagging
Date: Sat, 08 Feb 2014 15:59:31 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

You can also do precisely timed burst to stream conversion in pure-software which is a bit more portable For one example of how to do this using gr-eventstream tools see the transmitter in

On 02/08/2014 02:37 PM, Price, Nathan D. (S&T-Student) wrote:

I'm working on project in gnuradio, in which I'm trying to toggle on and off the transmission from the USRP.  After much 
research, I learned this was done by tagging the first sample of a transmission with "tx_sob" and the last 
sample with "tx_eob" (there was also a "tx_time" tag, but I found the former option more convenient). 
 I wrote a custom block that periodically tags segments out of continuous stream of data as a proof of concept; however, 
the transmission remains continuous as if there were no tag.  I've checked with the tag debugging block to ensure my 
block acutally generates tags. My flow graph is simply: file source(repeat)->custom tagging block->psk 
mod->multiply const->uhd sink.

Reading in the archive, I haven't found reference to success much success with 
the streaming API. I would love the community's input on this problem.


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