|From:||Marcus D. Leech|
|Subject:||Re: [Discuss-gnuradio] uhd running parallel tx/rx flowgraphs|
|Date:||Sun, 26 Feb 2012 21:09:24 -0500|
|User-agent:||Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:18.104.22.168) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16|
On 02/26/2012 08:54 PM, George Nychis wrote:
Yes, it is enabled in UHD. But since Gnu Radio is a *streaming* model, you need to take special measures to control TX from within a
Gnu Radio flow-graph. YOu need to insert a tag in the stream to control the transmitter, otherwise, you'll be continuously streaming.
What you do is insert a burst-tagger into your stream, and set it to send the appropriate tags for UHD into the stream using the trigger
input. I just can't off the top of my head, remember what those stream tags are at the moment. But the basic issue is that Gnu Radio
uses a streaming model, and while UHD itself (at the C++ level) has fine-grianed control over transmitter functions, etc, gr-uhd doesn't
directly expose any of that, because there's just not mechanism within Gnu Radio to expose that stuff. The stream tagging, however,
does allow you to control the transmitter state. In the particular case of the XCVR2450, the hardware is physically incapable of
TX and RX at the same time.
-- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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