Scott Mace wrote:
On 12/07/2009 04:13 PM, 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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I'm using soekris net4501s that I modified with phk's TMR1IN hack and
running nanobsd 7.2. One is fed with a trimble thunderbolt, one with
a z3801a, and another with either a Fury (which is usually running
with a LPRO-101 Rb unit) or whatever I happen to be experimenting with
at the time.
There is a write up here:
http://www.febo.com/pages/soekris/
I did mine similar to this except, I used a mini-din for the second
serial instead of the d-sub, external sma connectors for 10MHz and
1-PPS inputs, and built the clock synthesizer and pulse stretcher on
'surf board' prototype PCBs.
Scott
The clock stretcher isn't required with an M12M or M12+T as its PPS
pulse width is 200millisec.
Bruce
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