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From: | bob wole |
Subject: | Re: [Discuss-gnuradio] tx_time tag accuraccy |
Date: | Wed, 11 Jun 2014 08:25:24 +0500 |
On 06/09/2014 06:05 AM, bob wole wrote:
> Can I have a comment on it?
Bob,
we've given you a lot of information on this (see Tom's posts as a
start). If you still have questions, I recommend you start a new thread
and post exactly what you need to know and what your requirements are.
M
>
>
> --
> Bob
>
> On Thu, Jun 5, 2014 at 11:02 AM, bob wole <address@hidden
> <mailto:address@hidden>> wrote:
>
> Sorry for not stating the hardware earlier. I am using USRP N210,
> with RFX2400 and WBX boards.
>
> --
> Bob
>
> On Wed, Jun 4, 2014 at 11:07 PM, Marcus Leech <address@hidden
> <mailto:address@hidden>> wrote:
>
> I don't know the detailed answer, but any such answer will
> depend very much on which USRP hardware you're talking about.
>
> One of the R&D people who deals with the FPGA codebase may be
> able to give a precise answer, given stated hardware.
>
>
>
> on Jun 04, 2014, *bob wole* <address@hidden
> <mailto:address@hidden>> wrote:
>
> Marcus! Thanks for you comment.
>
> I think that USRP transmit FIFO is at the start of the DSP
> chain in FPGA i.e it is prior to both of the interpolation
> filters? right? I am not talking about when the burst will
> be over the air, I want to know when the first sample of the
> burst will leave the transmit FIFO if it has been tagged as
> tx_time=X.
>
>
>
> --
> Bob
>
>
> On Wed, Jun 4, 2014 at 10:51 PM, Marcus Leech
> <address@hidden <mailto:address@hidden>> wrote:
>
> It will depend some on the effective group delay of both
> the interpolation filters in the the FPGA and the analog
> group delay of the analog bits of whatever daughtercard
> you're using.
>
> The only way to be sure is to measure...
>
>
> on Jun 04, 2014, *bob wole via USRP-users*
> <address@hidden
> <mailto:address@hidden>> wrote:
>
> I am using stream tags for the transmission control.
> I want to know what is the accuracy/precision of the
> tx_time tag? E.g if I tag a burst A with tx_time=X,
> then the burst A will come out of the USRP transmit
> FIFO at X+delta, how large the value of delta could
> be?
>
>
> --
> Bob
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