[time-nuts] Followup (still want a GPS-type NTP refclock)

[Sarah White]

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Hi again everyone :)

Originally I was hoping for a thunderbolt. The control / diagnostic
software looked cool, but I couldn't afford the pricetag on one.

...Here's my followup now:

Determined I'd love to get my hands on an iLotus m12m.
That's just a statement. My heart is set on getting this.

Would it be possible to find a kit (new, used or otherwise) with:

1) iLotus M12M timing mode GPS (serial port version)
2) Aprox 10 meter antenna cable with apropriate connector(s)
3) active antenna which can handle being 10 meters from the module
4) power supply for above list, and much needed luck, all for under
$100 USD


Discovered something amusing about my sirf III GPS "mouse / puck" ---
uses the same prolific 2303 chip internally (same driver) as the USB
<---> Serial converter I dug out of my storage area and tested in the
past 24 hours... At least I know it works with the various operating
systems I'll be trying to time on...

Speaking of my ugly little $6 usb gps not-timing-mode module... I've
been playing with:

setupSiRFDemo.exe ((installer package dated from 2007))
6.37 MB (6,680,594 bytes)
CRC32: 147BF6E1
MD5: 2C1DC21831CC131AFFF3F6AEE6F392FF
SHA-1: 6A5F7940922A8360347784BC532CD67F39F387F3

Works fine for my crappy NMEA / sirf-binary GPS thingy... will this
also work for the iLotus M12M or is there a new or comparable version
of the same? (similar to the thunderbolt or sirf thingy) ...

Is the iLotus M12M actually sirf-based? Not quite sure based on a few
seemingly conflicting statements I've seen from diferent vendors.

Are these iLotus M12M basically aftermarket motorola oncore?

That's all I guess.

((digitally signed))
Sarah White

- --- Original post quoted below ---

Date: Sun, 19 Aug 2012 00:25:51 -0400
From: Sarah White <kuzetsa at gmail.com>
Subject: re: L1 GPS timing (followup)
Hi, this is my first post.

First off. Windows 7 USB connection to the GPS (no serial ports / modern
computer) and I'm pretty sure that is my main problem.

Past few months, I've been trying to figure out my timing issues. Lots
of reading & trying to figure out how to best configure everything. I'm
typically still off (randomly) by 20-100 miliseconds. I'd like to at
least get to within 50 microseconds (nanoseconds would be wonderful)

1) I need a computer with a serial port. The curent GPS module I'm using
is INTERNALLY RS232 --> USB converter, and recognized by my windows 7
computer as: "Prolific USB-to-Serial Comm Port (COM3)" ... the latency
and jitter is horrible, and both are seemingly random.

2) I need to run my stratum 1 clock (connected to the stratum 0 time
source via old-school RS232 serial) on linux or a form of BSD with
support for kernel timestamps, and a version of NTP with a driver to
supports my reference clock... points 1 and 2 seem fine.

3) I'm clueless about mounting an antenna, running cable, grounding /
lightning protection, etc... Really want an easy to install one.

For software, I've used 4.2.6 (stable / production) as well as 4.2.7
(dev version) NTP and haven't been able to tell any difference.
Just using the generic NMEA driver / this is a no-name cheapo SIRF module.

Also, trying to wrap my head around these:

http://linuxpps.org/wiki/index.php/LinuxPPS_installation
http://linuxpps.org/wiki/index.php/LinuxPPS_NTPD_support

And here is where I give up. As the subject line suggests:

HELP!!! I'd like to convert L1 GPS timing signal(s) into local time on
computer(s)
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