I guess it could be
zero usable satellites every day at about 8am for several days.
Lars
Från: Skip Withrow<mailto:skip.with...@gmail.com>
Skickat: den 4 oktober 2017 03:17
Till: time-nuts<mailto:time-nuts@febo.com>
Ämne: [time-nuts] Weird GPSDO behavior - update
Hello Time-Nu
There is apparently a way to update the Tbolt firmware. Several years ago a
Chinese seller of Tbolts was selling units that he upgraded the firmware from
v2.xx to v3.xx He may have pulled a new firmware chip and dumped the image
and re-programmed the older ones externally or used JTAG,
Is there a way you can force your currently disciplined oscillator to
free-run, and log the phase difference between oscillator and GPS over a
couple of days?
Tim N3QE
On Tue, Oct 3, 2017 at 2:15 PM, Skip Withrow wrote:
> Hello Time-Nuts,
>
> Well, I think I know a
19:15 (GMT+00:00) To: time-nuts <time-nuts@febo.com>
> Subject: [time-nuts] Weird GPSDO behavior - update
> Hello Time-Nuts,
>
> Well, I think I know a little more about my GPSDO problem, but
> probably have more questions now than before. Thanks for all the
> replies to
time-nuts@febo.com>
Subject: [time-nuts] Weird GPSDO behavior - update
Hello Time-Nuts,
Well, I think I know a little more about my GPSDO problem, but
probably have more questions now than before. Thanks for all the
replies to the first post with thoughts and suggestions.
I first tried res
Hello Time-Nuts,
Well, I think I know a little more about my GPSDO problem, but
probably have more questions now than before. Thanks for all the
replies to the first post with thoughts and suggestions.
I first tried restarting Lady Heather and doing a cold boot on the
NTGS50AA (then entering
den 28 september 2017 22:25
To: time-nuts<mailto:time-nuts@febo.com>
Subject: [time-nuts] Weird GPSDO behavior
Hello Time-Nuts,
I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt)
with the OCXO removed and a SRS PRS-10 rubidium oscillator in its
place. I have been running
A couple of things to try...
Turn on the OSC plot (G O) and see what that looks like... usually like a lot
of noise. Try with the display filter turned on (like F D 60).
The "&" menu lets you set the disciplining parameters. It will also bring up a
display of all the parameters. You can
den 28 september 2017 22:25
Till: time-nuts<mailto:time-nuts@febo.com>
Ämne: [time-nuts] Weird GPSDO behavior
Hello Time-Nuts,
I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt)
with the OCXO removed and a SRS PRS-10 rubidium oscillator in its
place. I have been running
Skip wrote:
I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt)
with the OCXO removed and a SRS PRS-10 rubidium oscillator in its place.
Once per day (about 8am) something disturbs the system. So, the GPSDO
spends much of its time recovering and never gives me anywhere near
I would have thought the easy test is to run the GPSDO on battery power
(perhaps with a UPS). Maybe that's not so easy?
--jh...@mit.edu
John Hawkinson
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It's not anything causing a GPS / tracking outage... the sat count plot does
not drop to 0.
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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
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
erley" <robkimber...@btinternet.com>
wrote:
> 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
>
wer 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,
&g
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
>
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
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
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.
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.
Hello Time-Nuts,
I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt)
with the OCXO removed and a SRS PRS-10 rubidium oscillator in its
place. I have been running Lady Heather 5.0 and have changed the
damping, gain, and time constant to give me a 20,000 second time
constant
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