[time-nuts] PPS for NTP Server - How Close Is "Good Enough"?

M. George m.matthew.george at gmail.com
Sat Jun 13 17:14:45 UTC 2015

Hal, what stopped me from going down the BBB path was the reports of RF
noise, they supposedly create a lot of noise.  Not acceptable in an HF
environment.  Google around about the RF noise with the BBB. mg NG7M

On Sat, Jun 13, 2015 at 12:02 AM, Hal Murray <hmurray at megapathdsl.net>

> eds_equipment at verizon.net said:
> > Is it possible to modify the kernel so the USB is polled more often, and
> > would that significantly reduce the jitter?
> Modifying the kernel may not be enough if the timing parameters are in the
> microcode for the USB device.
> Whether any improvement is significant probably depends upon your goals.
> It's unlikely to become a great NTP server.
> If I wanted a good low power NTP server, I'd probably start with a
> BeagleBone
> Black.  I haven't seen a low cost no-assembly-required GPS board for the
> (There is at least one GPS board for the BBB, but it includes a cell phone
> modem which doubles the cost.)  I'd probably try the GPS breakout board
> from
> SparkFun.  It should take 5 wires: power, ground, trans, recv, and PPS.
> (and
> then the appropriate software hacking)
> --
> These are my opinions.  I hate spam.
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M. George

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