Synchronizing two USRP2

GNU Radio
1

I understand that this can be done, by an external clock (GPS diciplined
OCXO), with the 10Mhz and 1PPS inputs.
is there any way I can tell the two usrp2’s to start together, instead
of
using the timestamps to synchronize them?

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2

I understand that this can be done, by an external clock (GPS diciplined
OCXO), with the 10Mhz and 1PPS inputs.
is there any way I can tell the two usrp2’s to start together, instead of
using the timestamps to synchronize them?

Hi,

There is a start streaming at command
([Discuss-gnuradio] Patch - USRP2: Sync to PPS and Start RX Streaming At)
which can be used to receive synchronously.

Cheers,

Christoph

3

Cheers for that Christoph, beats my post processing with timestamps fix!

For what its worth I’ve gotten away with fairly cheap TCXO’s (£15
generic
farnell ones) and a GPSDO circuit like the one at
VE2ZAZ - GPS-Derived 10MHz Frequency Standard (it did need some manual tuning at
first as the oscillators werent within the frequency locking range from
a
cold start) - you do get what you pay for with (double) ovenized CXO’s
ones
though. You tend to find them on the commericial boards (theres a
mailing
list post somewhere linking to a few options)

Tim

On Mon, Dec 14, 2009 at 7:16 AM, Christoph T. <

4

Tim P. wrote:

Tim

FYI - I believe the patch has been merged into the current git master -
so you if you’re tracking the git source you don’t need to manually
apply the patch anymore.
Doug

–
Douglas G.
Code 5545
U.S. Naval Research Laboratory
Washington, DC 20375
(202) 767-9048
[email protected]