AD
Arthur Dent
Fri, Aug 4, 2017 9:13 PM
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
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
PS
paul swed
Fri, Aug 4, 2017 10:10 PM
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
On Fri, Aug 4, 2017 at 5:13 PM, Arthur Dent golgarfrincham@gmail.com
wrote:
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
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 there.
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
On Fri, Aug 4, 2017 at 5:13 PM, Arthur Dent <golgarfrincham@gmail.com>
wrote:
> 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
> _______________________________________________
> 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 there.
>
CW
Chris Waldrup
Fri, Aug 4, 2017 10:27 PM
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
On Aug 4, 2017, at 4:13 PM, Arthur Dent golgarfrincham@gmail.com wrote:
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
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 there.
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
> On Aug 4, 2017, at 4:13 PM, Arthur Dent <golgarfrincham@gmail.com> wrote:
>
> 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
> _______________________________________________
> 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 there.
CW
Chris Waldrup
Sat, Aug 5, 2017 4:00 AM
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
On Aug 4, 2017, at 5:27 PM, Chris Waldrup kd4pbj@gmail.com wrote:
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
On Aug 4, 2017, at 4:13 PM, Arthur Dent golgarfrincham@gmail.com wrote:
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
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 there.
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
> On Aug 4, 2017, at 5:27 PM, Chris Waldrup <kd4pbj@gmail.com> wrote:
>
> 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
>
>> On Aug 4, 2017, at 4:13 PM, Arthur Dent <golgarfrincham@gmail.com> wrote:
>>
>> 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
>> _______________________________________________
>> 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 there.
PS
paul swed
Sat, Aug 5, 2017 2:47 PM
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.
On Sat, Aug 5, 2017 at 12:00 AM, Chris Waldrup kd4pbj@gmail.com wrote:
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
On Aug 4, 2017, at 5:27 PM, Chris Waldrup kd4pbj@gmail.com wrote:
Thanks guys.
I've opened up my T bolt and noticed a SOT23 packaged part has the top
The PPS BNC jack has U19 beside it.
The next part is blown. Could someone take a closeup of the five parts
The intact parts are marked:
5Dz
1AM
and two 2Az parts.
Chris
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
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
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
20bottom%201_zpschvruppt.jpg
mailman/listinfo/time-nuts
and follow the instructions there.
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.
On Sat, Aug 5, 2017 at 12:00 AM, Chris Waldrup <kd4pbj@gmail.com> wrote:
> 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
>
> > On Aug 4, 2017, at 5:27 PM, Chris Waldrup <kd4pbj@gmail.com> wrote:
> >
> > 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
> >
> >> On Aug 4, 2017, at 4:13 PM, Arthur Dent <golgarfrincham@gmail.com>
> wrote:
> >>
> >> 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
> >> _______________________________________________
> >> 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 there.
> _______________________________________________
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> and follow the instructions there.
>
AK
Attila Kinali
Sat, Aug 5, 2017 7:23 PM
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
On Sat, 5 Aug 2017 10:47:40 -0400
paul swed <paulswedb@gmail.com> wrote:
> 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
CS
Charles Steinmetz
Sat, Aug 5, 2017 8:07 PM
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
Arthur wrote:
> 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
CW
Chris Waldrup
Sun, Aug 6, 2017 8:56 PM
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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and follow the instructions there.
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
> On Aug 5, 2017, at 3:07 PM, Charles Steinmetz <csteinmetz@yandex.com> wrote:
>
> Arthur wrote:
>
>> 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>
> _______________________________________________
> 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 there.
V
Vlad
Tue, Aug 8, 2017 3:53 PM
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.
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.
MC
Mike Cook
Tue, Aug 8, 2017 5:09 PM
Le 8 août 2017 à 17:53, Vlad time@patoka.org a écrit :
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.
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 .
This is normal . The wizard has corrected the bad data.
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.
"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw
> Le 8 août 2017 à 17:53, Vlad <time@patoka.org> a écrit :
>
>
> 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.
>
> 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 .
>
>
> 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.
>
> 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
>
> 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.
>
> What else could be done to resurrect the device ? Thanks !
>
>
> --
> WBW,
>
> V.P.
> _______________________________________________
> 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 there.
"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw
