Why there are distribution amps? If there are other non-Resolution receivers (co-located and driven by the same antenna/distribution amp), what are they experiencing when there is the outage reported by the Resolution boards? Less-than-usual satellite count? Poor C/N? Can you log data?
On Mon, Sep 14, 2015 at 1:28 PM, Wojciech Owczarek <[email protected]> wrote: > Hello Time Nuts, > > I was wondering if other people have seen this. 20+ receivers and they all > use different variants of the Resolution boards - majority are the old > Resolution T.We have observed sudden GPS loss of signal occurring. > Seemingly nothing unusual, these things happen, that's what holdover is > for, etc... however: > > - All devices are connected via decent distribution amps, > - All installations use roof-mounted antennas with unobstructed 180 degree > sky view > - All devices see about 11 birds most of the time > - None of these events coincided with known GPS SV outages > > And here's the fun part: > > - This is happening in multiple locations in the US, AND in the UK > - The log timestamps (UTC) for the alarms, are *exactly the same* across > all sites, down to the second. This happens twenty to ten seconds before > midnight, and usually recovers within two or three minutes. > > The last event was on 5th September, at 23:59:37 UTC. We have seen this > happening anywhere between once every month to once every two months. Time > may differ by a few seconds, but it's the same across all devices. > > I'm trying to establish whether the issue is with Trimble or with the > vendor who embedded Trimble. Because of what I refer to as "vendor > anal-digital decoupling delay", I have to investigate in parallel. > > Has anyone seen this with Resolution? Unfortunately I have no visibility > into firmware versions in the Resolution boards. > > Any pointers welcome. > > Many thanks, > Wojciech > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
