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

[Azelio Boriani]

The iLotus M12M is the direct successor of the Motorola M12+ evolution of
the  OnCore series, for what I know. I have designed the first GPSDO for my
company based on the OnCore UT (1999), then just before going into full
production we switched to the M12+ (2000) meanwhile Motorola had become
iLotus (for the GPS stuff).

On Wed, Oct 17, 2012 at 9:50 AM, Sarah White <kuzetsa at gmail.com> wrote:

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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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