[time-nuts] Anybody have experience with TimeMachines TM1000AGPS Time Server

[Rick Thomas]

Hi Lizeth,

I’ve noticed that it’s very quick to come to a preliminary lock — though the lock is often exactly 1.000 sec off for 5-10 minutes.  Eventually that fixes itself.

Do you know if the NMEA output (once enabled, and once there is a listener to record it) would tell which satellites are visible and at what signal strength?

Mine is also just for home use for the time being.  I’m planning to get another one for use at the community radio station I volunteer at.

They are cheap enough that, with a grant from e.g. the NSF, we could get a bunch of them and scatter them all over the Internet.  With enough of them and some open software for monitoring, we could map one-way (as opposed to round-trip) times on various Internet routes — thus giving some hard data on route asymmetry.  This might prove to be interesting or even useful in diagnosing problems.

Just a thought…

Rick

On Nov 9, 2014, at 2:07 PM, Lizeth Norman <normanlizeth at gmail.com> wrote:

> Reading the manual, (page 8) the device can be set up to output NMEA
> over the serial port. There are a few different pieces of code to
> display that data.
> Have had mine two weeks. It got gps lock before I could point the
> browser at it's ip.
> Just syncing a bunch of cameras as well being the "house" time standard.
> 
> On Sun, Nov 9, 2014 at 4:49 PM, Rick Thomas <rbthomas at pobox.com> wrote:
>> 
>> Right.  I did the reset to factory defaults jumper thing and it came back to life.  I’m using it now with the default setup.
>> 
>> I got a reply from somebody named Doug at css-timemachines suggesting that I use a different browser (I had been using Safari on my desktop Mac) so I switched to Chrome (still on the Mac) and now it seems to be a bit more friendly.
>> 
>> In particular, it reports:
>> 
>>     Signal Strength: Satellite 1: 32 dB, Satellite 2: 31 dB, Satellite 3: 30 dB
>> 
>> Can anybody tell if that’s good or bad?  I have the antenna taped up against a window with a good view of the sky to the North-East: not too many trees in the way of a clear view out over the ocean — but somewhat occluded to the North-West: a low tree-covered ridge up to about 15 degrees above the horizon — and the bulk of the house in the way to the South.  Is there a better way?
>> 
>> I’ll report here as I explore further over the next week.
>> 
>> Rick
>> 
>> On Nov 9, 2014, at 2:21 AM, David C. Partridge <david.partridge at perdrix.co.uk> wrote:
>> 
>>>> If you’re referring to this:
>>> 
>>> I think he’s referring to section 4.3 "Resetting to Factory Defaults"
>> 
>>>> You also have to reboot after a PW change ...
>>> 
>>> Regards,
>>> David Partridge
>> 
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