Re: [time-nuts] time-nuts Digest, Vol 158, Issue 32 8 am GPS glitch Ideas

Something sitting on the antenna at certain times ? ie a pigeon or seagull.. Also electrical interference is a good possibility, I found that an SDR is a good general diagnostics method. Mine now has a chip antenna swiped from an ld Wifi dongle (2002) which helps a lot around 1 GHz and

Re: [time-nuts] HP-103AR frequency beyond adjustment

Thanks, Charles. I'll give it a try. Wanted to ask before attempting what will be for me a new procedure. I suppose I could also try replacing C117, the Fine Frequency Adjust capacitor, to see if that has any effect. C117 is a 6.8-99 pf variable geared to a shaft revolution counter. The counter

Re: [time-nuts] Better GPS coming to phones

On Thu, 28 Sep 2017 10:30:24 -0500 "Chris Caudle" wrote: > In a timing context, I would hope that having a more consistent solution > to the position/time equation would reduce the PPS jitter. It would be > really nice to see one of these low power, high precision

Re: [time-nuts] True Position GPSDP + Rb X72

On Sun, 24 Sep 2017 01:06:36 -0400 ewkehren via time-nuts wrote: > Starting with a 10 second clean up loop for a FEI 5680/GPSDO to now 600 > Seconds using Wenzel's j circuit for the Tbolt we have a variety of boards. Which one is Wenzel's j circuit? Google does not seem to

[time-nuts] Weird GPSDO behavior

It's not anything causing a GPS / tracking outage... the sat count plot does not drop to 0. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions

Re: [time-nuts] Weird GPSDO behavior

Hi If a simple GPS outage makes the GPSDO go bonkers, there is something else involved. Noise jamming or flying saucers over the antenna should just shut down the receiver. When it locks back up again, the disciplining should resume. If it goes into a death spiral that pretty strongly suggests

Re: [time-nuts] Weird GPSDO behavior

On 9/29/17 6:13 AM, Rob Kimberley wrote: I'd go with a power surge as it's so regular at 8AM. Rob Delivery truck with Jammer, as suggested by Graham also. There could be a RFI burst from something like a streetlight or storefront display turning on/off. Have you analyzed the timing of

Re: [time-nuts] Weird GPSDO behavior

Where I work, we had a high power system tripping and occasionally blowing up at 7:00 AM. It turned out that it was when the power company switched big capacitors across the lines as businesses got started to keep the power factor within their target range. It was creating just the kind of

Re: [time-nuts] Weird GPSDO behavior

How much jitter is there in the 8am number? If industrial, I could easily see the first shift coming in and all starting up at about the same time and shutting things off one by one as the jobs finish. But I would also expect it to not show up on weekends and/or holidays, etc. Same applies for

Re: [time-nuts] Weird GPSDO behavior

It makes me feel better (not good, just better) to know it's not just me... On Sep 29, 2017 7:19 AM, "Bob kb8tq" wrote: > Hi > > > > On Sep 28, 2017, at 6:59 PM, Mark Sims wrote: > > > > I suspect that it is either temperature related (the funkiness starts >

Re: [time-nuts] Weird GPSDO behavior

I'd go with a power surge as it's so regular at 8AM. Rob -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Skip Withrow Sent: 28 September 2017 21:18 To: time-nuts Subject: [time-nuts] Weird GPSDO behavior Hello Time-Nuts, I have a NTGS50AA GPSDO (close

Re: [time-nuts] Weird GPSDO behavior

Could be a delivery truck with a GPS jammer on it, that passes your location every morning at the same time. --- Graham == On Fri, Sep 29, 2017 at 7:18 AM, Bob kb8tq wrote: > Hi > > > > On Sep 28, 2017, at 6:59 PM, Mark Sims wrote: > > > > I suspect that it

Re: [time-nuts] Weird GPSDO behavior

Hi > On Sep 28, 2017, at 6:59 PM, Mark Sims wrote: > > I suspect that it is either temperature related (the funkiness starts around > when the temperature reaches a minimum) or related to the way the > disciplining parameters are hacked to get the extended time constant.

[time-nuts] Weird GPSDO behavior

I suspect that it is either temperature related (the funkiness starts around when the temperature reaches a minimum) or related to the way the disciplining parameters are hacked to get the extended time constant. Try setting up for say a 10,000 second time constant and see how things change.