On 06/11/2012 04:04 PM, Ryan Wolfarth wrote:
> 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.
>
>
>