[ntp:questions] Re: All my servers rejected
Richard B. Gilbert
rgilbert88 at comcast.net
Fri Jan 9 01:53:12 UTC 2004
I believe that the RadioShack GPS receivers are navigation rather than
timing. Synergy Systems sells a Motorola M12 Timing Evaluation kit for
$198. This includes a circuit board with the M12 and support
components, a wall wart for DC power, a hockey puck antenna with cable
and an RS232 cable. It has a one PPS output in addition to choice of
NMEA or Motorola Binary output formats. You need to mount the circuit
board in a box of some sort and hook it up to a computer.
I had hoped to have the one I've ordered in hand by now but no such
luck; I just talked to Synergy and they haven't shipped it yet. <sigh>
The RadioShack receiver would still be far superior to a satellite
connection with two to three second latency. A lot depends on how
closely he needs to synchronize.
Harlan Stenn wrote:
>I recommend the following:
>- Can you afford $200 for a GPS clock? I gathern RadioShack is closing out
> some (apparently tolerable) GPS receivers for about $30...
>- do what you can to get a local, reliable frequency source, so you can
> continue to have stable time when your link is down.
>- use iburst and burst (in your specific case - in most cases
> burst is Unfriendly)
>- use your pppup/pppdown scripts (or whatever) to handle enabling and
> disabling your ntp associations as your connection goes up and down
>This is somewhat discussed on twiki.ntp.org . I would be Happy to see
>more info there. Please help.
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