[USRP-users] Fwd: N200 stability

Nick Foster bistromath at gmail.com
Wed Apr 22 12:26:57 EDT 2015


How long was the GPSDO operating before, and then after, the power
interruption, when the measurements were made? GPSDOs require some time to
settle in and lock their clocks.

--n
On Apr 22, 2015 9:09 AM, "Dan Sego via USRP-users" <
usrp-users at lists.ettus.com> wrote:

> Resending the question below. With an addition. Operating both units,
> laptop and signal generator off a single power strip, I changed from lab
> power to an inverter (looking at/for any degradation that might result from
> noisy power). The inverter could not supply sufficient power, the signal
> gen tripped off line as did the laptop. Measurements made subsequently show
> an order of magnitude degradation
>
> Question: is the GPSDO susceptible to damage in low voltage/low power
> instance? If so is there a repair option from Ettus (emails to Ettus tech
> support have not been returned)
>
>
> vr. Dan
>
>
> thank you
> ---------- Forwarded message ----------
> From: Dan Sego <bubbadoradar at gmail.com>
> Date: Fri, Apr 17, 2015 at 6:08 AM
> Subject: N200 stability
> To: usrp-users at lists.ettus.com
>
>
> Good morning the list.
>
> I have 2 N200s w/ WBX connected via MIMO cable with an internal GPSDO on
> the master. I have attached calculated intra-channel and inter-channel
> phase stability calculations on from a tone generator. The results over
> approximately 100 seconds demonstrate about 0.15 radians of drift with
> a fair amount of low frequency noise. The low frequency noise (1 Hz-ish) is
> common to both channels.
>
> Are these results consistent with expectations? I have also attached the
> two channel code as I'm still not completely sure that I have configured
> the clock correctly (and by coincidence just seeing hanwen's posted query,
> in particular the option of GPSDO or? MIMO).
>
> Any and all advice is appreciated. Thanks
> Dan Sego
>
>
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