[time-nuts] Heol Design N024 GPS receiver

Sean Gallagher sean at wetstonetech.com
Mon Jun 15 14:35:01 EDT 2015

It also has better performance than the original board and some newer 
NTP servers that use older GPS. This is just based off of data that I'm 
reading. I'm not proficient enough to do testing and analysis on it 
other than the data sheet and what my TymServe display tells me.

If anyone has any questions I'd be more than happy to try and answer 
them however I don't really know all the technical stuff as well as most 
of you do.


Sean Gallagher
Malware Analyst

------ Original Message ------
From: "Sean Gallagher" <sean at wetstonetech.com>
To: "time-nuts at febo.com" <time-nuts at febo.com>
Sent: 6/15/2015 2:31:02 PM
Subject: Heol Design N024 GPS receiver

>So we finally got in our test Heol N024 GPS replacement board for the 
>Trimble Ace III that ran into the 1995 rollover and most notably 
>affected just about everyone with a Datum/Symmetricom/Microsemi 
>TymServe 2100.
>As Olivier Descoubes (the contact at Heol) posted I can confirm that 
>their firmware has corrected both the 1995 rollover and the 1 second 
>UTC offset that has been plaguing us since winter. I tried it in the 
>oldest Firmware that is the backup on the 2100 in case of failure (v 
>2.84 I think) along with versions 3.1 and currently running back up on 
>Also the board works with the Datum BC635pci cards as well for anyone 
>that uses those.
>Finally I am getting good time again to my servers without a mad 
>scientist setup going on.
>Full disclaimer though the price has increased. The original N024 
>boards were I believe 95 euro and are still available as such. However 
>these will not work with the TS2100 or bc635pci cards. It looked like 
>it was getting the location data right when I looked through some 
>settings on the 2100 but it won't translate the timing data right. The 
>V2 has the updated firmware that corrects the issues and works properly 
>but the price has gone up to something like 245 euro. Plus it's 
>shipping from France so you're looking at over $300 for this solution. 
>This was due to them putting in about 2-3 weeks of development and they 
>also purchased a 2100 for testing. They hope that after they sell some 
>units and offset those costs they can lower the price gradually down 
>again. I must say however that this $300 solution for us is far 
>superior to the $7,000 3xxx series replacement solution that Microsemi 
>was trying to sell me. Also Heol is stating a 1 year hardware warranty 
>and supporting the software to 2035. I must say that with this support 
>and maybe replacing my oscillator ( I think the original factory is 
>still in mine) that I can get years of service out of this still and 
>not break the bank.
>Sean Gallagher
>Malware Analyst

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