[time-nuts] FEI Nanosync 2

[Dave B]

Hi.

Firstly, I don't "know" the device you've got, but it may only be possible to intercept the timecode and correct it there "on the fly".

Unless, you can update the firmware on the FEI device, if such is available.  (You could contact FEI-Zyfer and ask?)

It may be easier just replace it with a Pi, or other PC hardware (anything from a Pentium-1 class box or later) running a bare bones FreeBSD with a generic GPS RX that can also supply a PPS signal, and have that work as your local NTP time source, internally correcting for the roll-over(s) (if the GPS can't handle it itself.)

It can also be configured to use external (if access is available) NTP time sources in the event your local GPS RX dies, someone covers it up, is killed & eaten by a passing dragon or whatever.

Lots of info here ( http://satsignal.eu/ntp/Raspberry-Pi-NTP.html ) for example...   No affiliation.

Or, replace it with a Nanosync 4  ( http://www.fei-zyfer.com/time_sync.htm )  If those later devices do the right thing, & funds are available etc etc.

Or, a LeoNTP device.  ( https://store.uputronics.com/index.php?route=product/product&product_id=92 )  Again, no affiliation, but I hear they are good.

Regards.

Dave G8KBV.



From: Eric Scace <eric at scace.org>
To: Time Nuts email list <time-nuts at lists.febo.com>
Subject: [time-nuts] FEI Nanosync 2
Message-ID: <8C9BBBEC-197D-4766-BD71-8A41B85CB7EC at scace.org>
Content-Type: text/plain;	charset=utf-8

Hi ?

   In a parallel life I work as a broadcast radio engineer. An AM transmitter's hybrid digital control system contains an embedded FEI Nanosync 2 GPS receiver. The GPS time data appears to suffer from a week 1024 rollover problem, causing the control system to believe (and broadcast) a date around 2000 November (if I remember correctly).

   I can get access to the serial port to the FEI Nanosync 2 card. Does anyone have experience or suggestions as to how to force this receiver to the proper date?

   Thanks for any help.

? Eric

p.s.: I apologize if the information requested below is in the archives somewhere. Is there an alternative search other than month-by-month?



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