Discussion:
Thunderbolt question
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Chris Waldrup
2017-08-04 02:22:16 UTC
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Hi,

I just noticed the laptop that is always connected to my Thunderbolt had a yellow block under COM1 on the Tboltmon program where it normally is green. Also the date up on the screen was in early July. Satellites were still shown.
The counter I leave connected still shows a 10 Mhz output.
I reset the program and this time all fields are ??? and com not detected.
I had thought maybe the laptop hung up.
I'll look at my system tomorrow. I'm trying to do a divide and conquer. If the Thunderbolt loses satellites, does it still put out a 10 Mhz signal?

Thank you.

Chris
KD4PBJ
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Didier Juges
2017-08-04 03:05:55 UTC
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"If the Thunderbolt loses satellites, does it still put out a 10 Mhz
signal?"

Yes of course. When that happens, the Thunderbolt is said to be in holdover.
Post by Chris Waldrup
Hi,
I just noticed the laptop that is always connected to my Thunderbolt had a
yellow block under COM1 on the Tboltmon program where it normally is green.
Also the date up on the screen was in early July. Satellites were still
shown.
The counter I leave connected still shows a 10 Mhz output.
I reset the program and this time all fields are ??? and com not detected.
I had thought maybe the laptop hung up.
I'll look at my system tomorrow. I'm trying to do a divide and conquer. If
the Thunderbolt loses satellites, does it still put out a 10 Mhz signal?
Thank you.
Chris
KD4PBJ
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Chris Waldrup
2017-08-04 03:21:30 UTC
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Thank you Didier.
I'll check tomorrow for further issues.

Chris
Post by Didier Juges
"If the Thunderbolt loses satellites, does it still put out a 10 Mhz
signal?"
Yes of course. When that happens, the Thunderbolt is said to be in holdover.
Post by Chris Waldrup
Hi,
I just noticed the laptop that is always connected to my Thunderbolt had a
yellow block under COM1 on the Tboltmon program where it normally is green.
Also the date up on the screen was in early July. Satellites were still
shown.
The counter I leave connected still shows a 10 Mhz output.
I reset the program and this time all fields are ??? and com not detected.
I had thought maybe the laptop hung up.
I'll look at my system tomorrow. I'm trying to do a divide and conquer. If
the Thunderbolt loses satellites, does it still put out a 10 Mhz signal?
Thank you.
Chris
KD4PBJ
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Chris Waldrup
2017-08-04 05:13:11 UTC
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Couldn't wait till morning on this as it was on my mind this evening. I unplugged the Thunderbolt from the wall and plugged it back in. Immediately the frequency counter attached went from 9.9999..... to zero then when it was powered back up went to the other side of 10 MHz at 10.000.... and "Disciplining" came up on the control program. I measured the voltage on the coax and it was 0.5V.
So no voltage out to antenna. I do have one of those 6V max polyphasers but we did get some really close strikes recently.
I've had to change the Oncore UT Plus receiver board once in my Datum Starloc II and it was easy. Hope this is a similar Motorola Oncore. I'll open it up tomorrow and see. I need to find a better source of the Oncore UT Plus modules rather than waiting for the Chinese slow boat.

Chris
Post by Chris Waldrup
Thank you Didier.
I'll check tomorrow for further issues.
Chris
Post by Didier Juges
"If the Thunderbolt loses satellites, does it still put out a 10 Mhz
signal?"
Yes of course. When that happens, the Thunderbolt is said to be in holdover.
Post by Chris Waldrup
Hi,
I just noticed the laptop that is always connected to my Thunderbolt had a
yellow block under COM1 on the Tboltmon program where it normally is green.
Also the date up on the screen was in early July. Satellites were still
shown.
The counter I leave connected still shows a 10 Mhz output.
I reset the program and this time all fields are ??? and com not detected.
I had thought maybe the laptop hung up.
I'll look at my system tomorrow. I'm trying to do a divide and conquer. If
the Thunderbolt loses satellites, does it still put out a 10 Mhz signal?
Thank you.
Chris
KD4PBJ
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Scott Newell
2017-08-04 12:49:51 UTC
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Post by Chris Waldrup
So no voltage out to antenna. I do have one of those 6V max
polyphasers but we did get some really close strikes recently.
Oh. As someone who lost a tbolt to lightning last year, I feel your pain.
Post by Chris Waldrup
I've had to change the Oncore UT Plus receiver board once in my
Datum Starloc II and it was easy. Hope this is a similar Motorola
Oncore. I'll open it up tomorrow and see. I need to find a better
source of the
There's no replaceable GPS module as such in the tbolt.
--
newell N5TNL

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Arthur Dent
2017-08-04 13:34:04 UTC
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The Thunderbolt is a single board with the GPS receiver in the lower right
between the oscillator case and the connectors in the photo in this link.

https://www.eevblog.com/forum/testgear/trimble-thunderbolt-gps-disciplined-oscillator/?action=dlattach;attach=102948;image
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paul swed
2017-08-04 13:45:49 UTC
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Arthur
Thanks for the picture. I have a TBolt also and its working just fine at
the moment.
But one day it may not. As several people have mentioned lightnings an
issue.

So going down the crazy thought path for a moment.
It appears from your pix you can figure out what the GPS receiver chip set
is.
The thought would be understand the chip set.
Locate the TX RX and 1pps and plug another receiver in.
Yes its a kluge and maybe a separate board level GPS receiver can not be
found...
But at least an approach.

One other comment. If it is lightning then just maybe its the preamp chip.
They are typically 3 pin soics and replaceable.
Regards
Paul
WB8TSL
Post by Arthur Dent
The Thunderbolt is a single board with the GPS receiver in the lower right
between the oscillator case and the connectors in the photo in this link.
https://www.eevblog.com/forum/testgear/trimble-thunderbolt-
gps-disciplined-oscillator/?action=dlattach;attach=102948;image
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Bob kb8tq
2017-08-04 15:38:20 UTC
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Hi
Post by paul swed
Arthur
Thanks for the picture. I have a TBolt also and its working just fine at
the moment.
But one day it may not. As several people have mentioned lightnings an
issue.
So going down the crazy thought path for a moment.
It appears from your pix you can figure out what the GPS receiver chip set
is.
The thought would be understand the chip set.
Locate the TX RX and 1pps and plug another receiver in.
Yes its a kluge and maybe a separate board level GPS receiver can not be
found...
But at least an approach.
On the TBolt … much more complex. The device looks at code phase to discipline
the OCXO. The “guts” of the TBolt need to work closely with the receiver. If you really
want to resurrect a dead one, it’s probably best to trace out the RF section and start
replacing this and that. This of course *assumes* it’s not blown someplace like the
RS-232 end of things … Most of the RF front end bits appear to be fairly generic. With
care, you should be able to swap them out.

Bob
Post by paul swed
One other comment. If it is lightning then just maybe its the preamp chip.
They are typically 3 pin soics and replaceable.
Regards
Paul
WB8TSL
Post by Arthur Dent
The Thunderbolt is a single board with the GPS receiver in the lower right
between the oscillator case and the connectors in the photo in this link.
https://www.eevblog.com/forum/testgear/trimble-thunderbolt-
gps-disciplined-oscillator/?action=dlattach;attach=102948;image
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Arthur Dent
2017-08-04 21:13:47 UTC
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Actually that isn't my photo I linked to but one I just Googled. That is
probably a board revision most people don't have but it was the first one
I saw so I used it just to show that the GPS receiver is part of the
only circuit board and not another easily replaceable board like in some
other units.

I just took a couple of photos of the later revision of the board for
anyone interested in seeing what might be fried. In the photo of the
top of the board the signal comes into a filter then to a 25db amp
marked AM50002 by Macom. Above the filter near the input is where the
decoupled +5VDC for the antenna is connected. If you are only reading
0.5VDC, if your're lucky it might only be the amp is fried and that
could be an easy fix. If the 5VDC is ok with the amp input pin lifted,
it might be the only problem. I wouldn't bet on it though. The 4031 I
believe is a 1575.42 SAW filter

The photo of the bottom of the receiver area shows a Sawtek filter and
other parts. At the bottom of the photo is C460, a feedthrough capacitor
and that might be where the receiver output is but where my Tbolts are
working I don't feel the need to look into whether you could connect
the output of a seperate GPS receiver there to make it work.

I do have one Tbolt that has no oscillator. I brought the EFC and 10Mhz
connections to SMA connectors on the back so I can test other oscillators
or GPSDOs that don't have an easy way to monitor of graph the stability
of those units and using Lady Heather gives me a good way to compare the
graphs to ones I'm used to. You might possibly be able to replace the
built-in receiver but it might be easier to buy a working Thunderbolt.


Loading Image...

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paul swed
2017-08-04 22:10:55 UTC
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Looked at the pix and yes the ant power are the caps and traces on the left.
Hard to get lightning through most saw filters. There is an inductor to the
right of the am50002 preamp and that would also be a great check. Open
shorted the V should be 1-3V approx. 0 or 5 is bad.
I looked to see if am50002 were available a quick search didn't show
anything.
Regards
Paul
WB8TSL
Post by Arthur Dent
Actually that isn't my photo I linked to but one I just Googled. That is
probably a board revision most people don't have but it was the first one
I saw so I used it just to show that the GPS receiver is part of the
only circuit board and not another easily replaceable board like in some
other units.
I just took a couple of photos of the later revision of the board for
anyone interested in seeing what might be fried. In the photo of the
top of the board the signal comes into a filter then to a 25db amp
marked AM50002 by Macom. Above the filter near the input is where the
decoupled +5VDC for the antenna is connected. If you are only reading
0.5VDC, if your're lucky it might only be the amp is fried and that
could be an easy fix. If the 5VDC is ok with the amp input pin lifted,
it might be the only problem. I wouldn't bet on it though. The 4031 I
believe is a 1575.42 SAW filter
The photo of the bottom of the receiver area shows a Sawtek filter and
other parts. At the bottom of the photo is C460, a feedthrough capacitor
and that might be where the receiver output is but where my Tbolts are
working I don't feel the need to look into whether you could connect
the output of a seperate GPS receiver there to make it work.
I do have one Tbolt that has no oscillator. I brought the EFC and 10Mhz
connections to SMA connectors on the back so I can test other oscillators
or GPSDOs that don't have an easy way to monitor of graph the stability
of those units and using Lady Heather gives me a good way to compare the
graphs to ones I'm used to. You might possibly be able to replace the
built-in receiver but it might be easier to buy a working Thunderbolt.
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%
20top%201_zpslgxunnyw.jpg
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%
20bottom%201_zpschvruppt.jpg
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Chris Waldrup
2017-08-04 22:27:28 UTC
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Thanks guys.
I've opened up my T bolt and noticed a SOT23 packaged part has the top blown off.
The PPS BNC jack has U19 beside it.
The next part is blown. Could someone take a closeup of the five parts around U19?
The intact parts are marked:
5Dz
1AM
and two 2Az parts.


Chris
Post by Arthur Dent
Actually that isn't my photo I linked to but one I just Googled. That is
probably a board revision most people don't have but it was the first one
I saw so I used it just to show that the GPS receiver is part of the
only circuit board and not another easily replaceable board like in some
other units.
I just took a couple of photos of the later revision of the board for
anyone interested in seeing what might be fried. In the photo of the
top of the board the signal comes into a filter then to a 25db amp
marked AM50002 by Macom. Above the filter near the input is where the
decoupled +5VDC for the antenna is connected. If you are only reading
0.5VDC, if your're lucky it might only be the amp is fried and that
could be an easy fix. If the 5VDC is ok with the amp input pin lifted,
it might be the only problem. I wouldn't bet on it though. The 4031 I
believe is a 1575.42 SAW filter
The photo of the bottom of the receiver area shows a Sawtek filter and
other parts. At the bottom of the photo is C460, a feedthrough capacitor
and that might be where the receiver output is but where my Tbolts are
working I don't feel the need to look into whether you could connect
the output of a seperate GPS receiver there to make it work.
I do have one Tbolt that has no oscillator. I brought the EFC and 10Mhz
connections to SMA connectors on the back so I can test other oscillators
or GPSDOs that don't have an easy way to monitor of graph the stability
of those units and using Lady Heather gives me a good way to compare the
graphs to ones I'm used to. You might possibly be able to replace the
built-in receiver but it might be easier to buy a working Thunderbolt.
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%20top%201_zpslgxunnyw.jpg
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%20bottom%201_zpschvruppt.jpg
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Chris Waldrup
2017-08-05 04:00:18 UTC
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Hi,

I've changed the blown MMBT3904 in the antenna sense circuit and I still have no 5V to the antenna. I measure 0.5V DC on the F connector.
There are two Murata filters (F2 and F3) on the RF path to the antenna. In between the two silver colored filters is a 6 lead SOT package marked 51A. The PCB silkscreen says Q13.
I have measured the following voltages on this part:
Pin 1= 0v
Pin 2= 0v
Pin 3= 0.749V
Pin 4= 4.892v
Pin 5= 0v
Pin 6= 3.417v

The trace from pin 3 of this part goes to the F2 filter and the output of F2 goes to the F connector. I'm getting 0.5V on the output of this filter. I'm suspecting this Q13 part may be bad but I'm not sure what the part is. Searching the net for 51A marking came up with a large 2 pin shottky which this isn't.

Chris
KD4PBJ
Post by Chris Waldrup
Thanks guys.
I've opened up my T bolt and noticed a SOT23 packaged part has the top blown off.
The PPS BNC jack has U19 beside it.
The next part is blown. Could someone take a closeup of the five parts around U19?
5Dz
1AM
and two 2Az parts.
Chris
Post by Arthur Dent
Actually that isn't my photo I linked to but one I just Googled. That is
probably a board revision most people don't have but it was the first one
I saw so I used it just to show that the GPS receiver is part of the
only circuit board and not another easily replaceable board like in some
other units.
I just took a couple of photos of the later revision of the board for
anyone interested in seeing what might be fried. In the photo of the
top of the board the signal comes into a filter then to a 25db amp
marked AM50002 by Macom. Above the filter near the input is where the
decoupled +5VDC for the antenna is connected. If you are only reading
0.5VDC, if your're lucky it might only be the amp is fried and that
could be an easy fix. If the 5VDC is ok with the amp input pin lifted,
it might be the only problem. I wouldn't bet on it though. The 4031 I
believe is a 1575.42 SAW filter
The photo of the bottom of the receiver area shows a Sawtek filter and
other parts. At the bottom of the photo is C460, a feedthrough capacitor
and that might be where the receiver output is but where my Tbolts are
working I don't feel the need to look into whether you could connect
the output of a seperate GPS receiver there to make it work.
I do have one Tbolt that has no oscillator. I brought the EFC and 10Mhz
connections to SMA connectors on the back so I can test other oscillators
or GPSDOs that don't have an easy way to monitor of graph the stability
of those units and using Lady Heather gives me a good way to compare the
graphs to ones I'm used to. You might possibly be able to replace the
built-in receiver but it might be easier to buy a working Thunderbolt.
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%20top%201_zpslgxunnyw.jpg
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%20bottom%201_zpschvruppt.jpg
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paul swed
2017-08-05 14:47:40 UTC
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The .5 on the f connector is an issue and thats through the filter on top
of the board made of traces and 3 caps. From Arthur's digging I would agree
he found the chip or one that would work. But that chips voltages seem to
match so most likely not the issue. What does the F connector measure to
ground? A strike could have burned the internals of the F connector. Above
the DC filer will be some form of current limiting. Maybe an inductor or
resistor.
Post by Chris Waldrup
Hi,
I've changed the blown MMBT3904 in the antenna sense circuit and I still
have no 5V to the antenna. I measure 0.5V DC on the F connector.
There are two Murata filters (F2 and F3) on the RF path to the antenna. In
between the two silver colored filters is a 6 lead SOT package marked 51A.
The PCB silkscreen says Q13.
Pin 1= 0v
Pin 2= 0v
Pin 3= 0.749V
Pin 4= 4.892v
Pin 5= 0v
Pin 6= 3.417v
The trace from pin 3 of this part goes to the F2 filter and the output of
F2 goes to the F connector. I'm getting 0.5V on the output of this filter.
I'm suspecting this Q13 part may be bad but I'm not sure what the part is.
Searching the net for 51A marking came up with a large 2 pin shottky which
this isn't.
Chris
KD4PBJ
Post by Chris Waldrup
Thanks guys.
I've opened up my T bolt and noticed a SOT23 packaged part has the top
blown off.
Post by Chris Waldrup
The PPS BNC jack has U19 beside it.
The next part is blown. Could someone take a closeup of the five parts
around U19?
Post by Chris Waldrup
5Dz
1AM
and two 2Az parts.
Chris
Post by Arthur Dent
Actually that isn't my photo I linked to but one I just Googled. That is
probably a board revision most people don't have but it was the first
one
Post by Chris Waldrup
Post by Arthur Dent
I saw so I used it just to show that the GPS receiver is part of the
only circuit board and not another easily replaceable board like in some
other units.
I just took a couple of photos of the later revision of the board for
anyone interested in seeing what might be fried. In the photo of the
top of the board the signal comes into a filter then to a 25db amp
marked AM50002 by Macom. Above the filter near the input is where the
decoupled +5VDC for the antenna is connected. If you are only reading
0.5VDC, if your're lucky it might only be the amp is fried and that
could be an easy fix. If the 5VDC is ok with the amp input pin lifted,
it might be the only problem. I wouldn't bet on it though. The 4031 I
believe is a 1575.42 SAW filter
The photo of the bottom of the receiver area shows a Sawtek filter and
other parts. At the bottom of the photo is C460, a feedthrough capacitor
and that might be where the receiver output is but where my Tbolts are
working I don't feel the need to look into whether you could connect
the output of a seperate GPS receiver there to make it work.
I do have one Tbolt that has no oscillator. I brought the EFC and 10Mhz
connections to SMA connectors on the back so I can test other
oscillators
Post by Chris Waldrup
Post by Arthur Dent
or GPSDOs that don't have an easy way to monitor of graph the stability
of those units and using Lady Heather gives me a good way to compare the
graphs to ones I'm used to. You might possibly be able to replace the
built-in receiver but it might be easier to buy a working Thunderbolt.
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%
20top%201_zpslgxunnyw.jpg
Post by Chris Waldrup
Post by Arthur Dent
http://i906.photobucket.com/albums/ac262/rjb1998/GPS%
20bottom%201_zpschvruppt.jpg
Post by Chris Waldrup
Post by Arthur Dent
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Post by Arthur Dent
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Attila Kinali
2017-08-05 19:23:24 UTC
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On Sat, 5 Aug 2017 10:47:40 -0400
Post by paul swed
The .5 on the f connector is an issue and thats through the filter on top
of the board made of traces and 3 caps. From Arthur's digging I would agree
he found the chip or one that would work. But that chips voltages seem to
match so most likely not the issue. What does the F connector measure to
ground? A strike could have burned the internals of the F connector. Above
the DC filer will be some form of current limiting. Maybe an inductor or
resistor.
Not necessarily. You need quite a bit of energy to leave visible
burn marks on a connector. It's more likely that the spike at the
input just reached a couple 100V. Too little to damage the connector,
but enough to fry a few components and make them go *pop*.


Attila Kinali
--
You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering. -- The Doctor
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Charles Steinmetz
2017-08-05 20:07:07 UTC
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I’d say it would be an MMIC amp similar to this device [Avago MGA-87563]
If a chip similar to the Avago part Arthur referenced is what is
installed, which seems plausible, the 0.749v on the RF input (Pin 3) is
a fault and is caused by an external source of voltage (3.417v) imposed
on the RF output (Pin 6) through the internal feedback resistor to Pin
3, attenuated by the gate resistor.

Avago says this particular chip needs to have 0vDC at Pins 3 and 6, so
if the connected parts would impose any DC voltage on those pins,
external blocking capacitors must be used on Pins 3 and 6. You might
check to see if there are blocking caps (at least at Pin 6), and if they
are good. (Alternatively, the internal output capacitor from Pin 6 back
to the output FET source may be bad.)

Of course, don't expect a bad external cap to be the only other problem
-- if it is bad, the 6-pin amp may well be bad, as well as whatever is
connected to the other side of the cap.

Best regards,

Charles
Chris Waldrup
2017-08-06 20:56:33 UTC
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Thanks everyone. This has given me a lot of things to check as I further investigate over the next few evenings. I'll let you know what I find.

Chris
I’d say it would be an MMIC amp similar to this device [Avago MGA-87563]
If a chip similar to the Avago part Arthur referenced is what is installed, which seems plausible, the 0.749v on the RF input (Pin 3) is a fault and is caused by an external source of voltage (3.417v) imposed on the RF output (Pin 6) through the internal feedback resistor to Pin 3, attenuated by the gate resistor.
Avago says this particular chip needs to have 0vDC at Pins 3 and 6, so if the connected parts would impose any DC voltage on those pins, external blocking capacitors must be used on Pins 3 and 6. You might check to see if there are blocking caps (at least at Pin 6), and if they are good. (Alternatively, the internal output capacitor from Pin 6 back to the output FET source may be bad.)
Of course, don't expect a bad external cap to be the only other problem -- if it is bad, the 6-pin amp may well be bad, as well as whatever is connected to the other side of the cap.
Best regards,
Charles
<Avago_MGA-87563_equiv_circ.png>
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Vlad
2017-08-08 15:53:27 UTC
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Hello Netizens,

After the power outage, my TB start to shows some strange behavior.

As I start LH, the screen shows like this (You could see the date stamp
as Dec 1997_

Loading Image...


Then, few seconds after, the date will be corrected

Loading Image...

And after another few seconds, I have a almost dark screen like this

Loading Image...

I tried to use ThunderBolt Monitor software to reset my TB to factory
settings. It didn't helps. This monitor always shows me correct time,
but date back from 1997. And its always no sats.

What else could be done to resurrect the device ? Thanks !
--
WBW,

V.P.
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paul swed
2017-08-08 17:11:42 UTC
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Vlad
I do not have all of the answers but the TBolt gps weeks rolled over
recently that is why the date is 1997 1024 weeks ago. LH is smart enough to
correct for the rollover and display correctly as many have mentioned on
time nuts.
But the TBolt will not ever on its own be correct.
For frequency and 1 pps not an issue. For NTP unfortunate.
By the way my TBolt fired up and tracked satellites without any trouble at
all.
Wrong date but other then that just fine.
Regards
Paul
WB8TSL
Post by Vlad
Hello Netizens,
After the power outage, my TB start to shows some strange behavior.
As I start LH, the screen shows like this (You could see the date stamp as
Dec 1997_
https://www.patoka.ca/OCXO/TBT0.png
Then, few seconds after, the date will be corrected
https://www.patoka.ca/OCXO/TBT1.png
And after another few seconds, I have a almost dark screen like this
https://www.patoka.ca/OCXO/TBT3.png
I tried to use ThunderBolt Monitor software to reset my TB to factory
settings. It didn't helps. This monitor always shows me correct time, but
date back from 1997. And its always no sats.
What else could be done to resurrect the device ? Thanks !
--
WBW,
V.P.
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Vlad
2017-08-08 23:38:41 UTC
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I solved an issue connecting TBolt directly to the PCIe Serial Card.
Previously I was using DigiKey PortServer device. Strange that it was
working OK for long period of time.
May be some recent MS update did something for the driver. Will
investigate it later.

Now I could see the sat. information on LH screen. As well there is no
"empty screen" any more ! Thanks everyone for support !

Regarding the date/time - personally I am using "chronyd" with 1PPS
interface via RS232. This setup works perfectly fine for my lab.


210 Number of sources = 5
.- Number of sample points in measurement
set.
/ .- Number of residual runs with same
sign.
| / .- Length of measurement set
(time).
| | / .- Est. clock freq error
(ppm).
| | | / .- Est. error in
freq.
| | | | / .- Est.
offset.
| | | | | | On
the -.
| | | | | |
samples. \
| | | | | |
|
Name/IP Address NP NR Span Frequency Freq Skew Offset
Std Dev
==============================================================================
PPS0 6 3 81 -0.000 0.029 -2ns
208ns
ntp2.torix.ca 13 9 224m +0.097 0.285 -1578us
1085us
ntp3.torix.ca 20 9 327m +0.219 0.142 -1167us
951us
time.allover.co.za 6 5 85m -0.368 2.634 +1947us
1074us
206.108.0.134 6 5 102m -0.149 0.735 -3899us
422us
Post by paul swed
But the TBolt will not ever on its own be correct.
For frequency and 1 pps not an issue. For NTP unfortunate.
By the way my TBolt fired up and tracked satellites without any trouble at
It would be nearly trivial to write a t-bolt specification reference
clock for NTP. The driver would correct the date the same way LH
does. Maybe six lines of C code max.
--
Chris Albertson
Redondo Beach, California
--
WBW,

V.P.
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Mike Cook
2017-08-08 17:09:26 UTC
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Post by Vlad
Hello Netizens,
After the power outage, my TB start to shows some strange behavior.
Was it a normal power outage , or lightning strike ? Mine just went through a normal power outage without issue.
Post by Vlad
As I start LH, the screen shows like this (You could see the date stamp as Dec 1997_
https://www.patoka.ca/OCXO/TBT0.png
This is normal now that the GPS week rollover has occurred for these devices.
Strange that there are no sat stats as the antenna status looks ok, there is an almanac and it would appear that the date and time are being retrieved for some sat .
Post by Vlad
Then, few seconds after, the date will be corrected
https://www.patoka.ca/OCXO/TBT1.png
This is normal . The wizard has corrected the bad data.
Post by Vlad
And after another few seconds, I have a almost dark screen like this
https://www.patoka.ca/OCXO/TBT3.png
I haven’t seen this
Post by Vlad
I tried to use ThunderBolt Monitor software to reset my TB to factory settings. It didn't helps. This monitor always shows me correct time, but date back from 1997. And its always no sats.
Tboltmon has no date fix. Again strange that no sat data is available, like the receiver is not reporting sv data to the application.
Post by Vlad
What else could be done to resurrect the device ? Thanks !
--
WBW,
V.P.
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"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw

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Arthur Dent
2017-08-05 12:23:21 UTC
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Pin 1= 0v
Pin 2= 0v
Pin 3= 0.749V
Pin 4= 4.892v
Pin 5= 0v
Pin 6= 3.417v

I’d say it would be an MMIC amp similar to this device. It

has the same pin-out so it is a possibility. The Amp In

my newer version is an 23 db gain device but 8-pin so I

Suspect your version may have similar specs. Here is a

Datasheet on the MGA-87563 6-pin device.



http://www.efo.ru/components/avago/catalog/files/pdf/AV01_0200EN.PDF
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