I have one of these units running here under Red Hat Fedora Core 9 as
follows based on a collection of a number of the on-line docs I've
looked at. What I'd like to know is as follows:
1) Is this working well or poorly?
2) Is there any way I can use both the GPS time data AND the PPS
signal without having to recompile the kernel as on FC9 its not that
easy to do as it comes down as an RPM and I don't think the patches
are built for it...
3) I'd like to share the GPS/PPS signals via gpsd with another Linux
system if possible would that be usable or accurate enough or should I
just synch off this one at stratum 2?
3) Any other suggestions that anyone would care to make, I don't claim
to be an expert here:
Thank you very much.
George
sym links from
/dev/gps0 -> /dev/ttyS0
/dev/pps0 -> /dev/ttyS0
running the gpsd and the 18LVC off ttyS0 at 4800 baud settings on
18LVC done as per quan web page docs to set NEMA and PPS auto Off etc.
setserial /dev/ttyS0 uart 16550A port 0x03f8 irq 4 baud_base 115200
spd_normal skip_test low_latency
/usr/sbin/gpsd -b -n /dev/ttyS0
./shmpps -d /dev/ttyS0 -s -l DCD -u 0 -c
my ntpd.conf looks like:
server 127.127.28.0 minpoll 4 prefer
fudge 127.127.28.0 refid PPS flag3 1
server 0.us.pool.ntp.org
server 1.us.pool.ntp.org
server 2.us.pool.ntp.org
And looking at ntpq stats shows me:
# ntpq -p
remote refid st t when poll reach delay offset
jitter
==============================================================================
*SHM(0) .PPS. 0 l 13 16 377 0.000 -0.056
0.013
-mighty.poclabs. 64.202.112.75 2 u 800 1024 377 12.243 2.336
0.316
-clock3.redhat.c 66.187.233.4 2 u 946 1024 257 59.126 2.760
42.876
-192.157.38.60 192.36.143.150 2 u 807 1024 377 119.111 1.110
0.037
# ntpdc -c kern
pll offset: -5.7e-05 s
pll frequency: 111.071 ppm
maximum error: 0.009019 s
estimated error: 1.3e-05 s
status: 0001 pll
pll time constant: 10
precision: 1e-06 s
frequency tolerance: 500 ppm
--
===[George R. Kasica]=== +1 262 677 0766
President +1 206 374 6482 FAX
Netwrx Consulting Inc. Jackson, WI USA
http://www.netwrx1.com
[email protected]
ICQ #12862186
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