There is a Garmin GPS 18x High-Sensitivity LVC Sensor 010-00321-36 for sale
on eBay here:
http://www.ebay.com/itm/Garmin-GPS-18x-High-Sensitivity-LVC-Sensor-010-00321
-36-/222277215324?hash=item33c0c1245c:g:L-gAAOSwOyJX-6Dn&vxp=mtr for only
$45.86 USD, $59.99 C in Canada.  I bought one from eBay for $39 not too long
ago, so all you really have to do is look.

The Sure device works, but for me it was too difficult to make the PPS work.
I bought two and was unable to make either one output a detectable PPS.  The
PPS was there, my scope told me so, but I could not make the computer detect
it.  On the other hand, I am very clumsy, and have little experience with
electronics.

Charles Elliott

-----Original Message-----
From: questions
[mailto:questions-bounces+elliott.ch=comcast....@lists.ntp.org] On Behalf Of
William Unruh
Sent: Thursday, February 2, 2017 1:06 AM
To: questions@lists.ntp.org
Subject: Re: [ntp:questions] Time syncing with something other than ntpd

On 2017-02-02, sean <s...@sean.eternal-september.org> wrote:
> On 2017-02-01, David Taylor <david-tay...@blueyonder.co.uk.invalid> wrote:
>>
>> Sean,
>>
>> Thanks for your comments - much of the Web site is comprised of my 
>> own notes to remind me what to do next time!  Still waiting for one 
>> minor operation, and then to see if (or should it be when?) the Crohn's
returns.
>>
>
> Well your self made notes for yourself have proven to have a rich 
> amount of helpful information. :) Keep the faith with your healing.
>
>> Unfortunately I can't be part of the pool as my ISP doesn't offer 
>> static addresses.
>>
>
> I posted a followup whether a hostname could be used in lieu leui of 
> an IP address. I understand it can't change every few hours/days. Does 
> your changed that frequently?
>
>> I don't know whether FreeBSD is better than Linux any more, others 
>> will need to answer that.  My FreeBSD box refused to update from 
>> FreeBSD 7 to FreeBSD 8, so I stuck Linux on it in desperation!
>
> Wow, those versions are well before my time with FreeBSD. I'm not sure 
> if I'll be that concerned about the OS, and rather focus on the GPS 
> equipment you linked to below.
>
>>
>> Another low-cost device is the Sure evaluation board:
>>
>>    http://www.satsignal.eu/ntp/Sure-GPS.htm
>>
>>  
>> http://www.ebay.com/itm/SKG16A-Bluetooth-RS232-USB-UART-GPS-Module-De
>> mo-Board-/230844194302
>>
>
> Thanks for the link! That's about half the price of the garmin and 
> would likely get me better precision than just syncing to the NTP pool.

Yes.
>
>> Windows uses NTP but not with the reference implementation, so of 
>> unknown quality, and not manageable in the same way.  It used to be 
>> lousy, and I've not tested since then.
>>
>
> I think I'll install the ntp client on my windows machine and see what 
> kind of time I can get.

You would probably be better off syncing a linux machine to the gps board
and then syncing the windows machine to that over the local Lan.


>
>> What will be good enough depends on your needs.  The lowest cost 
>> might be the Sure board attached to an existing FreeBSD box, running 
>> 24 x 7 and in as stable a thermal environment as necessary.  Both the 
>> Raspberry Pi and BeagleBone Black are low-power devices and therefore 
>> low-cost to run 24 x 7, with the BBB having a slightly better 
>> Ethernet implementation if you need to get down to the tens of 
>> microseconds level, but with the Raspberry Pi have a much wider 
>> support even though it might offer (approx) fifties of microseconds.
Judge for yourself here:
>>
>>    http://www.satsignal.eu/ntp/BBB-vs-RPi.html
>>
>> If you already have an RPi doing something, adding a NTP server to 
>> its tasks will make little extra load for an environment with a 
>> thousand or more clients....
>>
>
> Incidentally I do have a BBB and a few raspberry pis. The BBB goes 
> back and forth to/from work so I won't be able to use that as the NTP
host.
>
> As an aside, have you done anything with SDR? You may be interested in
> this:
> https://github.com/flightaware/piaware
>

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