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Re: [Discuss-gnuradio] UHD transmission timing control is quite tricky y

From: Josh Blum
Subject: Re: [Discuss-gnuradio] UHD transmission timing control is quite tricky yet.
Date: Wed, 19 Jan 2011 21:47:39 -0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101208 Lightning/1.0b2 Thunderbird/3.1.7

The multi usrp wrapper has a method built in to synchronize a collection
of devices when the PPS edge event is unknown to the computer. You may
want to use the multi_usrp, and in any case, see the comments on
synchronization here:

On 01/19/2011 09:29 PM, Sangho Oh wrote:
> I am trying to achieve two synchronized transmissions from two USRP2s.
> Both USRPs are connected to each host PC and feed with 5PPS clocks, without
> 10Mhz reference clock.
> But I cannot make it happen yet.

no common reference means clock drift

> However, the two transmissions are not synchronized well. There is a
> significant timing offset between the two transmissions, which
> is hundreds of milliseconds.

perhaps a multiple of 200 ms, which is the period of your pulses.


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