On 16/05/2023 20:31, Michael Toussaint wrote:
Hi,
I am testing the LO synching on a single N321 using the 2 Tx channels
on the N321.
I have followed the LO setup steps from the knowledge base,
https://kb.ettus.com/USRP_N320/N321_LO_Distribution, to distribute the
LO. (Sample Python code used for setup below)
I am using separate streamers for each Tx channel and noticing a delay
between the 2 channels executing.
Yeah, using separate streamers, the code doesn't attempt synchronization
across two streamers. You'll need a single
two-channel streamer--that's the "synchronization paradigm" that has
been in UHD for over a decade...
The Tx channels do not appear to be synchronized, we're measuring
anywhere from 0.5ns to 4ns of delay across the channels.
1) Is there a recommended process for synchronizing 2 Tx output
channels and the output LOs on the N321?
a) Would using a single streamer for both Tx channels reduce the
execution delay?
Thanks,
Michael
""" Sample Python Code Used for LO Setup """
import argparse
import logging
import sys
sys.path.append('/usr/lib/python3/dist-packages/')
import uhd
def main():
parser = argparse.ArgumentParser()
parser.add_argument("-a", "--args", default="name=SDR1", type=str)
args = parser.parse_args()
usrp = uhd.usrp.MultiUSRP(args.args)
usrp.set_tx_lo_source("external", "lo1", 0)
usrp.set_tx_lo_source("external", "lo1", 1)
usrp.set_tx_lo_export_enabled(True, "lo1", 0)
hw_lo_export_path =
'blocks/0/Radio#0/dboard/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_1/export'
if usrp.get_tree().exists(hw_lo_export_path):
usrp.get_tree().access_bool(hw_lo_export_path).set(True)
if __name__ == "__main__":
logging.basicConfig(format='%(asctime)s [%(levelname)s]:
%(message)s', level=logging.DEBUG)
main()
""" End of Code """
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