Quoting Madan <ma...@mymowireless.com>:
Hi
I am choosing the GPS receiver to make the timing synchronization between
the two USRP2's. I have already placed an order, and it would take few days
to reach here.
Mean while , i wanted to learn about how to synchronize the USRP2's using
GPS reciever, Can anyone guide me , how to ?
and from where i can get some useful material or information to setup and
synchronize USRP2's using GPS receiver...!
By searching the google , i had found some information regarding the USRP2
sychroniztion.
relating to calling the function
config_mimo(MC_WE_LOCK_TO_SMA) and sync_to_pps( )
for locking to USRP2 to external clock 10MHz and 1PPS,
My question is Can anyone give me a clear picture, how to configure these
programs and to synchronize two USRP2's.
I am not going to use MIMO(using to MIMO cable given) configuration right
now, currently i am only focusing on SISO config.
If synchronising USRP2's in MIMO case is different from SISO, can you please
differentiate.
Thanks in advance
MADAN
I can just tell you about my experience (for what is worth :-). I
synchronized the TX and RX using a 10MHz reference from a signal
generator. I filtered the 10MHz using a band-pass filter from
mini-circuits and then splitted with a mini-circuits splitter. Then I
connected a step function to the pps inputs which I manually triggered.
I modified the apps for transmitting and receiving samples which are
somewhere under usrp2/apps or something like that. I had a ten second
sleep in the program to be able to start both USRP2s and manually
trigger the step function. It seemed to work great with very repeatable
results (basic db-boards cable between TX and RX). I can send my ugly
code (which uses the VRT branch). The next step for me is to use a real
GPS but other duties has taken over...
One thing more.
When I cold start the USRP2s it seems to take some seconds before they
are firmly locked to the 10MHz reference.
This shows that a GPS is not strictly needed.
BR/
Per
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