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Re: [Discuss-gnuradio] gr-uhd: rx_freq tag and lo_locked

From: Anderson, Douglas J.
Subject: Re: [Discuss-gnuradio] gr-uhd: rx_freq tag and lo_locked
Date: Wed, 1 Apr 2015 17:49:47 +0000


I think we could have the same effect with a much simpler solution:

What about adding an lo_locked metadata tag to the stream of samples?

You could send lo_locked value=False on the last sample before LO unlocks, and 
lo_locked value=True for first sample after LO locks. That should be (?) simple 
to implement and would be equally as useful.

Otherwise, determining the first usable sample, as you said, "depends on pretty 
much everything", and that's a lot to push down on the end user.


From: address@hidden address@hidden on behalf of Martin Braun address@hidden
Sent: Wednesday, April 01, 2015 11:30 AM
To: address@hidden
Subject: Re: [Discuss-gnuradio] gr-uhd: rx_freq tag and lo_locked

On 31.03.2015 14:25, Anderson, Douglas J. wrote:
> Marcus,
> That makes sense, I hadn't thought of the DSP tuning issue, though I
> think it would be infinitely more useful to make the stream tagging
> logic aware of LO/DSP tuning and tag the first usable block in either
> case. Slightly more involved than I assumed though.

That is correct. It depends on pretty much everything, at the very least
which exact device + d'board combo you're using.


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