Alexander Sack wrote:
On Mon, Dec 7, 2009 at 5:20 PM, Bruce Griffiths
<[email protected]> wrote:
Alexander Sack wrote:
Hi Everybody:
First post, be gentle. I did some mail-list archive searching and it
seems
that a lot of folks have used the Garmin 18x LVC as their 1PPS sync for
the
desktop with varied success (5V via USB port and RS-232 for 1PPS?). At
work, I have experience with an Endrun Cf/Ct receiver connected to a small
CDMA antennae (as well as GPS receiver) which works pretty well (I suppose
its more relative to my crappy motherboard oscillator than anything). I
have no idea how much they run (I think the CDMA one was like $200 and
something).
What are my options in this realm? Surprisingly enough, Googling for over
an hour didn't yield much results. There are tons of companies that offer
various solutions but with little pricing information. I'd be happy to
hear
some suggestions OTHER THAN the Garmin 18x LVC?
(btw is there such a thing as a desktop rubidium atomic clock with 1 PPS?)
Thanks!
-aps
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A Soekris 4501 running nanobsd using an M12+T or M12M GPS timing receiver
works very well.
Failing that an M12+T or M12M GPS timing receiver also works well with a
desktop machine that runs FreeBSD.
Yeah I'm running FBSD (actually that's my day job). What's the
M12+T/M12M, is that a Motorola substance? Linky-link?
-aps
The M12+T is a Motorola GPS timing receiver (can be picked up on ebay)
but requires an CMOS- to RS232 transceiver chip and a few other parts as
well as an active GPS antenna.
The iLotus M12M is the replacement and can be purchased from Synergy GPS
complete with a suitable motherboard and puck style antenna.
A GPS timing antenna (eg VIC100) with integral 1575MHz bandpass filters
is more resistant to interference.
http://www.synergy-gps.com/index.php?option=com_content&task=blogcategory&id=32&Itemid=116
<http://www.synergy-gps.com/index.php?option=com_content&task=blogcategory&id=32&Itemid=116>
for the M12M timing starter kit which has everything needed to get you
started.
later depending on your location you may want to upgrade to a timing
antenna:
http://www.synergy-gps.com/index2.php?option=com_content&do_pdf=1&id=139
<http://www.synergy-gps.com/index2.php?option=com_content&do_pdf=1&id=139>
I have an M12+T currently serving as the ref clock for a Soekris4501 ntp
server (runs nanobsd generated from FreeBSD 7.20 I am about to upgrade
to a version derived from FreeBSD 8.0 ).
It has previously been used as the ref clock for an old desktop Pentium
ntp server running FreeBSD 6.0
Bruce
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