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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