Re: [Discuss-gnuradio] timestamps inband

On Mon, Jul 27, 2009 at 7:06 AM, Johnathan Corgan <jcorgan@xxxxxxxxxxxxxxxxxxxxx> wrote:

On Mon, Jul 27, 2009 at 06:28, Dimitris Symeonidis<azimout@xxxxxxxxx> wrote:

> Do we even need timestamps, or are the samples aligned (interleaved)
> anyway, even with the standard FPGA image? We don't care about
> absolute time, just time (phase) difference between the two channels.

With the standard image, if you've set the mux and number of channels
appropriately, then the interleaved channels are coherently sampled
(assuming you are using daughterboards with coherent local
oscillators.)

Regarding the inband code, this has become unmaintained; we've already
removed it on our 3.3 development trunk.  The host code will get
rewritten using the 3.3 message passing architecture.  The FPGA code
has issues (as you've noted), and I think there are some patches
floating around that fix some of them, but haven't gotten integrated.
Eric might have a better handle on this.

You can try some firmwares that Eric Schneider built in an attempt to fix the timestamps with 2 channels:
http://www.schneider-group.com/gnuradio/r9581-ets-inband_2rxhb_2tx.zip

Search for his name on the list archives and you'll find the discussion.

- George 

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