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Re: [Discuss-gnuradio] GRC with two URSP2+DBSRX and UHD

From: Thomas Hobiger
Subject: Re: [Discuss-gnuradio] GRC with two URSP2+DBSRX and UHD
Date: Mon, 29 Nov 2010 14:54:20 +0900
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Hi Josh,Hi Josh,
Thanks for the reply. I am using a MIMO cable between both URSP2s, so I 
thought that they sync automatically.
I am not feeding a PPS to both devices, as I only need to run both 
synchronously, but I don't need to sync them to outside references.

Aha. That feature is not implemented, but it is not far away. For the
time being, the devices will need a shared PPS to sync. I believe that
you can configure one of the USRP2 to lock reference over the mimo
cable, but you will have to modify the python code a bit.

I see. But this can't be the (only) reason for my errors. When I select "don't sync" I don't get the warning abou the time stamps but I end up again with

OOUHD source block got error code 0x1
gr_block_executor: source <gr_block uhd multi_usrp source (1)> produced no output.  We're marking it DONE.

Where does this come from? I tried to input 1 PPS signals into both USRP2s but that also does not solve the problem. Any ideas?

When the MIMO cable support is completed, you will plug one device into
the ethernet (this will be the master). And the slave device will lock
its reference and sync its time over the MIMO cable. Both devices will
communicate to the host via ethernet.
Do you have any schedule for that development? Does this mean that the data (physically) streams from the slave devices throught the master device before going out through a single ethernet cable?


Dr. Thomas Hobiger
Space-Time Measurement Project
Space-Time Standards Group
New Generation Network Research Center
National Institute of Information and Communications Technology
4-2-1 Nukui-Kitamachi, Koganei
184-8795 Tokyo
email:  address@hidden
phone:  ++81-042-327-7561
fax:    ++81-042-327-6664
homepage (priv.): http://www.hobiger.org

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