Software Defined Radio
On Wednesday, July 19, 2017 8:40 AM, "m.roth at 5-cent.us"
<m.roth at 5-cent.us> wrote:
Chris Olson wrote:>
> Several weeks ago, we posted a message seeking information about
> time sources.? There were many helpful and educational responses.
> An excerpt from one of the responses is included below.? We have
> been following up with regard to how SDR capabilities might be
> used for obtaining time using SDR dongles as well as using the
> time source product referenced in that response.
<snip>
I missed that one, so a clarification, please: is that
software-defined-radio, or the SDR that ipmitool offers info on, or....
? ? mark
--
The great thing about standards is that there are so many of them....
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On 7/19/2017 11:41 AM, Chris Olson wrote:> Software Defined Radio >I wouldn't want to use SDR as a simple time source.... SDR uses a /lot/ of CPU to make up for the lack of radio hardware. It would make far more sense to get a dedicated WWV or GPS reciever to use as a time reference, unless you're going to dedicate a server just to be a software radio. -- john r pierce, recycling bits in santa cruz
On Wed, July 19, 2017 1:57 pm, John R Pierce wrote:> On 7/19/2017 11:41 AM, Chris Olson wrote: >> Software Defined Radio >> > > > I wouldn't want to use SDR as a simple time source.... SDR uses a /lot/ > of CPU to make up for the lack of radio hardware. It would make far > more sense to get a dedicated WWV or GPS reciever to use as a time > reference, unless you're going to dedicate a server just to be a > software radio.I would second that and also would add that SDR adds latency to what gets on its output, the last grossly depends on system load, and is affected by system scheduler etc, hence, IMHO SDR is poor device to time synchronization in general. Valeri> > > > > > -- > john r pierce, recycling bits in santa cruz > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++