Hi all,
My research group is continuing our setup of two servers with multiple
N210s for a GNSS application. Each server will have 4 or 5 N210s
recording RF data at frequencies of interest. All are to be locked to
the 10MHz reference and 1 PPS output from a Septentrio PolaRxS. I
have successfully tested our PPS arrangement using test_pps_input.
However, test_dboard_coercion sometimes reports an unsuccessful lock
to our external oscillator. The number of unsuccessful locks varies
with the inputs to test_dboard_coercion:
Set1: "--rx --ref external" reports an unsuccessful ref lock at 1500MHz
Set2: "--rx --ref external --no_rx_gain" reports an unsuccessful ref
lock at 1500, 1550, 1700, 1750, 1800, 1850, 1900, 1950, and 2000MHz.
These unsuccessful locks are intermittent. The results for Set2 don't
worry me so much: we're always running at high gain when recording.
What is the cause and is there a good solution to this problem? Our
plan is to have all N210s writing constantly to a ring buffer, but
only writing to file when triggered by an external source. The
reference lock is critical since we're studying GNSS signals. Any
help is appreciated. I know this list usually hits it out of the
park, so I'm looking forward to your responses!
Thank you,
Ryan
Setup: Dell PowerEdge R510 running UHD 3.4.2 on Ubuntu 12.04 server.
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After splitting your 10Mhz reference, what is the power going to each N210?
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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