Re: [time-nuts] Z3801A recovering

[Art Sepin]

Joe,

In a way, the VP Service Note: 
http://www.synergy-gps.com/images/stories/ShopTalk/vp_service_note.pdf ties 
into the VP Oncore Startup Note because it is associated with the VP Oncore's 
Pendulum oscillator.

Back in the late nineties, some customers noted that VP Oncore signal strength 
diminished over time when operating 24/7/365. Motorola determined that the 
decreased sensitivity was caused by crystal aging which is normally corrected 
every time the VP is power-cycled. Power-cycling lets the VP write the 
appropriate, aged, oscillator characteristics to EEPROM to reset the VP to its 
expected performance range. If you note signal strengths being reduced over 
time, then it would be wise to power-cycle your VP -  Otherwise, just let it 
run.

Art



-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray
Sent: Tuesday, April 26, 2016 2:14 PM
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Subject: Re: [time-nuts] Z3801A recovering

Art,

Thanks for the link. Very useful information. I also read the 'VP Service note" 
posted there. Is that note also referring to the oscillator, or some other 
component that needs periodic recalibration.
In any case, it seems that they are recommending that we power down our GPSDO 
units every few months. Not something I'd like to do, considering it would take 
a while to stabilize again.

Joe Gray
W5JG


On Tue, Apr 26, 2016 at 12:39 PM, Art Sepin <a...@synergy-gps.com> wrote:
> Joe,
>
> There is a "VP Oncore Startup" note here that's worth a try:
>
> https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fwww.sy
> nergy-gps.com%2findex.php%3foption%3dcom_content%26task%3dview%26id%3d
> 42%26Itemid%3d89=01%7c01%7cart%40synergy-gps.com%7c1cb76a2494c44f
> 59344908d36e1e9356%7cc81f9fdec0e04d8c95779afaa0cad9ed%7c1=voZraL
> rW%2bW827wV3qF8HsbZaRda09LAvawpb3DCk4wg%3d
>
> Please note that if the above link expands to more than one line after it 
> leaves our server it is due to our use of MS SafeLinks app in Outlook. If the 
> link is not active, just go to:
> Synergy-gps.com\Tech Support\ Shop Talk and scroll down to the start-up note.
>
> Art Sepin
>
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Re: [time-nuts] Z3801A recovering

[Joseph Gray]

After about three hours:
https://dl.dropboxusercontent.com/u/19599147/Z3801A%203hr.png

Ignore the graph discontinuity at the beginning. I had to power cycle
to change to UTC.


Joe Gray
W5JG


On Sun, May 1, 2016 at 1:30 AM, Joseph Gray  wrote:
> In past discussions about replacing a 6-channel Oncore in a Z3801A
> with an 8-channel VP Oncore, some claimed that the VP had to first be
> put into 6-channel mode, others indicated this was not necessary.
> Earlier tonight, I put a VP (still in 8-channel mode) into my
> malfunctioning Z3801A. Monitoring with Z38xx, I see no signs that this
> is a problem. Even the logs look clean.
>
> In reading the VP documentation, I saw that there were several
> 6-channel commands, along with similar 8-channel commands. That is why
> I thought I'd try using the VP without setting it to 6-channel mode.
> It was an experiment that seems to have succeeded.
>
> I don't want to jinx things, but so far, my formerly flaky Z3801A is
> working normally, after replacing the GPS module. The self survey
> finished in two hours (about 25 minutes ago). The EFC and PPS TI/s
> graphs are no longer going wild.
>
> I'm going to monitor this for quite a while before I call it fixed.
> Then it's on to repairing the Z3801A that I traded for.
>
> In addition to replacing the GPS module, I also replaced three caps on
> the power supply board. On initial inspection, C108 and C110 had a
> faint white ring around them, on the PCB, as though they had out
> gassed. There was also some corrosion on pin TP104, which sits between
> C108 and C110. The caps checked fine with my LCR meter, but I thought
> I'd replace them while I had things apart. I also replaced C111, which
> is nearby. When I removed the caps, there was no corrosion on the PCB.
>
> When I inspected the other Z3801A which is awaiting repair, I saw the
> same faint white rings around C108 and C110. There was no corrosion on
> TP104, however. I will replace those caps as well, when I get to it.
>
>
> Joe Gray
> W5JG
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Re: [time-nuts] Z3801A recovering

[Joseph Gray]

In past discussions about replacing a 6-channel Oncore in a Z3801A
with an 8-channel VP Oncore, some claimed that the VP had to first be
put into 6-channel mode, others indicated this was not necessary.
Earlier tonight, I put a VP (still in 8-channel mode) into my
malfunctioning Z3801A. Monitoring with Z38xx, I see no signs that this
is a problem. Even the logs look clean.

In reading the VP documentation, I saw that there were several
6-channel commands, along with similar 8-channel commands. That is why
I thought I'd try using the VP without setting it to 6-channel mode.
It was an experiment that seems to have succeeded.

I don't want to jinx things, but so far, my formerly flaky Z3801A is
working normally, after replacing the GPS module. The self survey
finished in two hours (about 25 minutes ago). The EFC and PPS TI/s
graphs are no longer going wild.

I'm going to monitor this for quite a while before I call it fixed.
Then it's on to repairing the Z3801A that I traded for.

In addition to replacing the GPS module, I also replaced three caps on
the power supply board. On initial inspection, C108 and C110 had a
faint white ring around them, on the PCB, as though they had out
gassed. There was also some corrosion on pin TP104, which sits between
C108 and C110. The caps checked fine with my LCR meter, but I thought
I'd replace them while I had things apart. I also replaced C111, which
is nearby. When I removed the caps, there was no corrosion on the PCB.

When I inspected the other Z3801A which is awaiting repair, I saw the
same faint white rings around C108 and C110. There was no corrosion on
TP104, however. I will replace those caps as well, when I get to it.


Joe Gray
W5JG
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Re: [time-nuts] Z3801A recovering

[Joseph Gray]

Art,

Thanks for the link. Very useful information. I also read the 'VP
Service note" posted there. Is that note also referring to the
oscillator, or some other component that needs periodic recalibration.
In any case, it seems that they are recommending that we power down
our GPSDO units every few months. Not something I'd like to do,
considering it would take a while to stabilize again.

Joe Gray
W5JG


On Tue, Apr 26, 2016 at 12:39 PM, Art Sepin  wrote:
> Joe,
>
> There is a "VP Oncore Startup" note here that's worth a try:
>
> http://www.synergy-gps.com/index.php?option=com_content=view=42=89
>
> Please note that if the above link expands to more than one line after it 
> leaves our server it is due to our use of MS SafeLinks app in Outlook. If the 
> link is not active, just go to:
> Synergy-gps.com\Tech Support\ Shop Talk and scroll down to the start-up note.
>
> Art Sepin
>
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Re: [time-nuts] Z3801A recovering

[Art Sepin]

Joe,

There is a "VP Oncore Startup" note here that's worth a try:

http://www.synergy-gps.com/index.php?option=com_content=view=42=89

Please note that if the above link expands to more than one line after it 
leaves our server it is due to our use of MS SafeLinks app in Outlook. If the 
link is not active, just go to:
Synergy-gps.com\Tech Support\ Shop Talk and scroll down to the start-up note.

Art Sepin

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray
Sent: Tuesday, April 26, 2016 6:25 AM
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Subject: Re: [time-nuts] Z3801A recovering

Now that I finally have some replacement Oncore VP modules, I've been able to 
do some tests and comparisons. Using WinOncore 12, I tested the VP's that I got 
from Pete. Then I compared the old module from the Z3801A. The old module seems 
to be deaf. It reports that it sees plenty of satellites, but didn't lock onto 
any when left running overnight.

Either tonight or tomorrow night, I'm going to put one of the tested VP modules 
into the Z3801A and see how things go. I will also be replacing a few caps that 
tested good, but looked suspicious. There were signs of outgassing on the power 
supply board.

While waiting for Pete to make the VP modules available, I bought two
UT+ modules from ebay. After reading various documentation, I found
out that you can't use a UT+ in a Z3801A. It's a shame, because the
UT+ seems much more sensitive and locks much quicker than the VP
modules. I may be able to use the UT+ modules elsewhere.


Joe Gray
W5JG


On Fri, Mar 18, 2016 at 8:21 AM, John Green <wpxs...@gmail.com> wrote:
> Joe, I'd be interested in knowing what you find out. My Z3801 is 
> acting a lot like yours. It is currently locked, but.
>
> On Thu, Mar 17, 2016 at 8:15 AM, Joseph Gray <jg...@zianet.com> wrote:
>
>> Dave,
>>
>> I power cycled it about 20 days ago, which did no good. That is the
>> 496 hours holdover time. This time, I did just the survey once 
>> command. I'll try your suggestion before attacking the hardware. I'm 
>> currently using Z38xx.exe.
>>
>> Joe Gray
>> W5JG
>>
>>
>> On Thu, Mar 17, 2016 at 4:30 AM, Artek Manuals 
>> <manu...@artekmanuals.com>
>> wrote:
>> > Joe
>> >
>> > I am confused by the fact that it shows the unit has been in 
>> > HOLDOVER for
>> > 496 hours if you did a fresh survey
>> >
>> > Did you do a SYSTEM:PRESET: and GPS:POS:SURVEY:ONCE commands to 
>> > initiate
>> the
>> > new survey or just the survey command or  What software are you
>> running?
>> >
>> > I would power the unit down and let it sit for 24 hours and then do 
>> > the
>> two
>> > commands above.
>> >
>> > What software are you running?
>> >
>> > Dave
>> > NR1DX
>> >
>> >
>> >
>> >
>> >
>> > On 3/16/2016 7:38 PM, Joseph Gray wrote:
>> >>
>> >> As I mentioned a while back, my trusty Z3801A, which has worked 
>> >> well for several years, went into holdover some time ago and stayed there.
>> >> Until recently, I haven't had time to look into this. About 20 
>> >> days ago, I did power cycle it to see if that made a difference. 
>> >> It did not.
>> >>
>> >> In the middle of the night, last night (couldn't sleep), I decided 
>> >> to see what initiating a new survey would do. Since the unit 
>> >> doesn't lock to as many satellites as my Lucent with the newer 
>> >> Oncore, it took quite a while for the survey to finish.
>> >>
>> >> I just got home from work and this is what I am seeing:
>> >>
>> >> https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fd
>> >> l.dropboxusercontent.com%2fu%2f19599147%2fZ3801A.png=01%7c01%
>> >> 7cart%40synergy-gps.com%7c806e79510b664f4468de08d36de38cd0%7cc81f9
>> >> fdec0e04d8c95779afaa0cad9ed%7c1=EoghTK2%2fgWHqF%2bSob3KljLru
>> >> wIeKclGiNc0AJ4%2bRYF0%3d
>> >>
>> >> The good news is that the unit no longer telling me the PPS is 
>> >> invalid. It looks like it will be another long while before it 
>> >> comes out of Recovery (assuming the PPS stays locked).
>> >>
>> >> I'm not the best at interpreting these graphs. At this point, 
>> >> should I be concerned abouth the spikey nature of the EFC graph, 
>> >> or will things calm down eventually? I assume that the PPS graph 
>> >&

Re: [time-nuts] Z3801A recovering

[Joseph Gray]

Now that I finally have some replacement Oncore VP modules, I've been
able to do some tests and comparisons. Using WinOncore 12, I tested
the VP's that I got from Pete. Then I compared the old module from the
Z3801A. The old module seems to be deaf. It reports that it sees
plenty of satellites, but didn't lock onto any when left running
overnight.

Either tonight or tomorrow night, I'm going to put one of the tested
VP modules into the Z3801A and see how things go. I will also be
replacing a few caps that tested good, but looked suspicious. There
were signs of outgassing on the power supply board.

While waiting for Pete to make the VP modules available, I bought two
UT+ modules from ebay. After reading various documentation, I found
out that you can't use a UT+ in a Z3801A. It's a shame, because the
UT+ seems much more sensitive and locks much quicker than the VP
modules. I may be able to use the UT+ modules elsewhere.


Joe Gray
W5JG


On Fri, Mar 18, 2016 at 8:21 AM, John Green  wrote:
> Joe, I'd be interested in knowing what you find out. My Z3801 is acting a
> lot like yours. It is currently locked, but.
>
> On Thu, Mar 17, 2016 at 8:15 AM, Joseph Gray  wrote:
>
>> Dave,
>>
>> I power cycled it about 20 days ago, which did no good. That is the
>> 496 hours holdover time. This time, I did just the survey once
>> command. I'll try your suggestion before attacking the hardware. I'm
>> currently using Z38xx.exe.
>>
>> Joe Gray
>> W5JG
>>
>>
>> On Thu, Mar 17, 2016 at 4:30 AM, Artek Manuals 
>> wrote:
>> > Joe
>> >
>> > I am confused by the fact that it shows the unit has been in HOLDOVER for
>> > 496 hours if you did a fresh survey
>> >
>> > Did you do a SYSTEM:PRESET: and GPS:POS:SURVEY:ONCE commands to initiate
>> the
>> > new survey or just the survey command or  What software are you
>> running?
>> >
>> > I would power the unit down and let it sit for 24 hours and then do the
>> two
>> > commands above.
>> >
>> > What software are you running?
>> >
>> > Dave
>> > NR1DX
>> >
>> >
>> >
>> >
>> >
>> > On 3/16/2016 7:38 PM, Joseph Gray wrote:
>> >>
>> >> As I mentioned a while back, my trusty Z3801A, which has worked well
>> >> for several years, went into holdover some time ago and stayed there.
>> >> Until recently, I haven't had time to look into this. About 20 days
>> >> ago, I did power cycle it to see if that made a difference. It did
>> >> not.
>> >>
>> >> In the middle of the night, last night (couldn't sleep), I decided to
>> >> see what initiating a new survey would do. Since the unit doesn't lock
>> >> to as many satellites as my Lucent with the newer Oncore, it took
>> >> quite a while for the survey to finish.
>> >>
>> >> I just got home from work and this is what I am seeing:
>> >>
>> >> https://dl.dropboxusercontent.com/u/19599147/Z3801A.png
>> >>
>> >> The good news is that the unit no longer telling me the PPS is
>> >> invalid. It looks like it will be another long while before it comes
>> >> out of Recovery (assuming the PPS stays locked).
>> >>
>> >> I'm not the best at interpreting these graphs. At this point, should I
>> >> be concerned abouth the spikey nature of the EFC graph, or will things
>> >> calm down eventually? I assume that the PPS graph won't show until
>> >> Recovery is done?
>> >>
>> >> If this unit loses PPS lock again, or otherwise acts up, then I would
>> >> assume it is a hardware problem, and I'll have to put it on the bench.
>> >>
>> >> Joe Gray
>> >> W5JG
>> >> ___
>> >> 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.
>> >>
>> >
>> >
>> > --
>> > Dave
>> > manu...@artekmanuals.com
>> > www.ArtekManuals.com
>> >
>> > ---
>> > This email has been checked for viruses by Avast antivirus software.
>> > https://www.avast.com/antivirus
>> >
>> >
>> > ___
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>> > and follow the instructions there.
>> >
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Re: [time-nuts] Z3801A recovering

[Artek Manuals]

Joe

I am confused by the fact that it shows the unit has been in HOLDOVER 
for 496 hours if you did a fresh survey


Did you do a SYSTEM:PRESET: and GPS:POS:SURVEY:ONCE commands to initiate 
the new survey or just the survey command or  What software are you 
running?


I would power the unit down and let it sit for 24 hours and then do the 
two commands above.


What software are you running?

Dave
NR1DX




On 3/16/2016 7:38 PM, Joseph Gray wrote:

As I mentioned a while back, my trusty Z3801A, which has worked well
for several years, went into holdover some time ago and stayed there.
Until recently, I haven't had time to look into this. About 20 days
ago, I did power cycle it to see if that made a difference. It did
not.

In the middle of the night, last night (couldn't sleep), I decided to
see what initiating a new survey would do. Since the unit doesn't lock
to as many satellites as my Lucent with the newer Oncore, it took
quite a while for the survey to finish.

I just got home from work and this is what I am seeing:

https://dl.dropboxusercontent.com/u/19599147/Z3801A.png

The good news is that the unit no longer telling me the PPS is
invalid. It looks like it will be another long while before it comes
out of Recovery (assuming the PPS stays locked).

I'm not the best at interpreting these graphs. At this point, should I
be concerned abouth the spikey nature of the EFC graph, or will things
calm down eventually? I assume that the PPS graph won't show until
Recovery is done?

If this unit loses PPS lock again, or otherwise acts up, then I would
assume it is a hardware problem, and I'll have to put it on the bench.

Joe Gray
W5JG
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--
Dave
manu...@artekmanuals.com
www.ArtekManuals.com

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Re: [time-nuts] Z3801A recovering

[Bob Camp]

Hi

If you look at the scale on the EFC plot, it’s likely showing you a 1 LSB 
change on the dac….

Bob

> On Mar 16, 2016, at 7:38 PM, Joseph Gray  wrote:
> 
> As I mentioned a while back, my trusty Z3801A, which has worked well
> for several years, went into holdover some time ago and stayed there.
> Until recently, I haven't had time to look into this. About 20 days
> ago, I did power cycle it to see if that made a difference. It did
> not.
> 
> In the middle of the night, last night (couldn't sleep), I decided to
> see what initiating a new survey would do. Since the unit doesn't lock
> to as many satellites as my Lucent with the newer Oncore, it took
> quite a while for the survey to finish.
> 
> I just got home from work and this is what I am seeing:
> 
> https://dl.dropboxusercontent.com/u/19599147/Z3801A.png
> 
> The good news is that the unit no longer telling me the PPS is
> invalid. It looks like it will be another long while before it comes
> out of Recovery (assuming the PPS stays locked).
> 
> I'm not the best at interpreting these graphs. At this point, should I
> be concerned abouth the spikey nature of the EFC graph, or will things
> calm down eventually? I assume that the PPS graph won't show until
> Recovery is done?
> 
> If this unit loses PPS lock again, or otherwise acts up, then I would
> assume it is a hardware problem, and I'll have to put it on the bench.
> 
> Joe Gray
> W5JG
> ___
> time-nuts mailing list -- time-nuts@febo.com
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Re: [time-nuts] Z3801A recovering

[Joseph Gray]

Dave,

I power cycled it about 20 days ago, which did no good. That is the
496 hours holdover time. This time, I did just the survey once
command. I'll try your suggestion before attacking the hardware. I'm
currently using Z38xx.exe.

Joe Gray
W5JG


On Thu, Mar 17, 2016 at 4:30 AM, Artek Manuals  wrote:
> Joe
>
> I am confused by the fact that it shows the unit has been in HOLDOVER for
> 496 hours if you did a fresh survey
>
> Did you do a SYSTEM:PRESET: and GPS:POS:SURVEY:ONCE commands to initiate the
> new survey or just the survey command or  What software are you running?
>
> I would power the unit down and let it sit for 24 hours and then do the two
> commands above.
>
> What software are you running?
>
> Dave
> NR1DX
>
>
>
>
>
> On 3/16/2016 7:38 PM, Joseph Gray wrote:
>>
>> As I mentioned a while back, my trusty Z3801A, which has worked well
>> for several years, went into holdover some time ago and stayed there.
>> Until recently, I haven't had time to look into this. About 20 days
>> ago, I did power cycle it to see if that made a difference. It did
>> not.
>>
>> In the middle of the night, last night (couldn't sleep), I decided to
>> see what initiating a new survey would do. Since the unit doesn't lock
>> to as many satellites as my Lucent with the newer Oncore, it took
>> quite a while for the survey to finish.
>>
>> I just got home from work and this is what I am seeing:
>>
>> https://dl.dropboxusercontent.com/u/19599147/Z3801A.png
>>
>> The good news is that the unit no longer telling me the PPS is
>> invalid. It looks like it will be another long while before it comes
>> out of Recovery (assuming the PPS stays locked).
>>
>> I'm not the best at interpreting these graphs. At this point, should I
>> be concerned abouth the spikey nature of the EFC graph, or will things
>> calm down eventually? I assume that the PPS graph won't show until
>> Recovery is done?
>>
>> If this unit loses PPS lock again, or otherwise acts up, then I would
>> assume it is a hardware problem, and I'll have to put it on the bench.
>>
>> Joe Gray
>> W5JG
>> ___
>> 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.
>>
>
>
> --
> Dave
> manu...@artekmanuals.com
> www.ArtekManuals.com
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
>
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Re: [time-nuts] Z3801A recovering

[Joseph Gray]

The saga continues. Last night, I hooked up the second Z3801A that I
got recently. At first, it was having a hard time finding satellites
and then locking. I did a PRESET and started a new survey late last
night. All day and this evening, it has been operating flawlessly.
Tonight, I did a quick power cycle to get the date set correctly.

https://dl.dropboxusercontent.com/u/19599147/Z3801A%20%232.png

>From the graph, you can see where I restarted it at the left. It then
runs fine for several hours. But look at the latest. And of course, it
keeps going into holdover. During all of this, it has been tracking
from 2-6 satellites, mostly about 4-5. So, unit #2 definitely has a
problem.

It's late, so I'm going to leave it alone until tomorrow, when I'll
open it up and probe around a bit. I'll pay particular attention to
the tantalum caps, which someone mentioned. As old as these things
are, it wouldn't surprise me if some were bad.

Joe Gray
W5JG

On Fri, Mar 18, 2016 at 8:21 AM, John Green  wrote:
> Joe, I'd be interested in knowing what you find out. My Z3801 is acting a
> lot like yours. It is currently locked, but.
>
> On Thu, Mar 17, 2016 at 8:15 AM, Joseph Gray  wrote:
>
>> Dave,
>>
>> I power cycled it about 20 days ago, which did no good. That is the
>> 496 hours holdover time. This time, I did just the survey once
>> command. I'll try your suggestion before attacking the hardware. I'm
>> currently using Z38xx.exe.
>>
>> Joe Gray
>> W5JG
>>
>>
>> On Thu, Mar 17, 2016 at 4:30 AM, Artek Manuals 
>> wrote:
>> > Joe
>> >
>> > I am confused by the fact that it shows the unit has been in HOLDOVER for
>> > 496 hours if you did a fresh survey
>> >
>> > Did you do a SYSTEM:PRESET: and GPS:POS:SURVEY:ONCE commands to initiate
>> the
>> > new survey or just the survey command or  What software are you
>> running?
>> >
>> > I would power the unit down and let it sit for 24 hours and then do the
>> two
>> > commands above.
>> >
>> > What software are you running?
>> >
>> > Dave
>> > NR1DX
>> >
>> >
>> >
>> >
>> >
>> > On 3/16/2016 7:38 PM, Joseph Gray wrote:
>> >>
>> >> As I mentioned a while back, my trusty Z3801A, which has worked well
>> >> for several years, went into holdover some time ago and stayed there.
>> >> Until recently, I haven't had time to look into this. About 20 days
>> >> ago, I did power cycle it to see if that made a difference. It did
>> >> not.
>> >>
>> >> In the middle of the night, last night (couldn't sleep), I decided to
>> >> see what initiating a new survey would do. Since the unit doesn't lock
>> >> to as many satellites as my Lucent with the newer Oncore, it took
>> >> quite a while for the survey to finish.
>> >>
>> >> I just got home from work and this is what I am seeing:
>> >>
>> >> https://dl.dropboxusercontent.com/u/19599147/Z3801A.png
>> >>
>> >> The good news is that the unit no longer telling me the PPS is
>> >> invalid. It looks like it will be another long while before it comes
>> >> out of Recovery (assuming the PPS stays locked).
>> >>
>> >> I'm not the best at interpreting these graphs. At this point, should I
>> >> be concerned abouth the spikey nature of the EFC graph, or will things
>> >> calm down eventually? I assume that the PPS graph won't show until
>> >> Recovery is done?
>> >>
>> >> If this unit loses PPS lock again, or otherwise acts up, then I would
>> >> assume it is a hardware problem, and I'll have to put it on the bench.
>> >>
>> >> Joe Gray
>> >> W5JG
>> >> ___
>> >> 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.
>> >>
>> >
>> >
>> > --
>> > Dave
>> > manu...@artekmanuals.com
>> > www.ArtekManuals.com
>> >
>> > ---
>> > This email has been checked for viruses by Avast antivirus software.
>> > https://www.avast.com/antivirus
>> >
>> >
>> > ___
>> > 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.
>> >
>> ___
>> 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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Re: [time-nuts] Z3801A recovering

[John Green]

Joe, I'd be interested in knowing what you find out. My Z3801 is acting a
lot like yours. It is currently locked, but.

On Thu, Mar 17, 2016 at 8:15 AM, Joseph Gray  wrote:

> Dave,
>
> I power cycled it about 20 days ago, which did no good. That is the
> 496 hours holdover time. This time, I did just the survey once
> command. I'll try your suggestion before attacking the hardware. I'm
> currently using Z38xx.exe.
>
> Joe Gray
> W5JG
>
>
> On Thu, Mar 17, 2016 at 4:30 AM, Artek Manuals 
> wrote:
> > Joe
> >
> > I am confused by the fact that it shows the unit has been in HOLDOVER for
> > 496 hours if you did a fresh survey
> >
> > Did you do a SYSTEM:PRESET: and GPS:POS:SURVEY:ONCE commands to initiate
> the
> > new survey or just the survey command or  What software are you
> running?
> >
> > I would power the unit down and let it sit for 24 hours and then do the
> two
> > commands above.
> >
> > What software are you running?
> >
> > Dave
> > NR1DX
> >
> >
> >
> >
> >
> > On 3/16/2016 7:38 PM, Joseph Gray wrote:
> >>
> >> As I mentioned a while back, my trusty Z3801A, which has worked well
> >> for several years, went into holdover some time ago and stayed there.
> >> Until recently, I haven't had time to look into this. About 20 days
> >> ago, I did power cycle it to see if that made a difference. It did
> >> not.
> >>
> >> In the middle of the night, last night (couldn't sleep), I decided to
> >> see what initiating a new survey would do. Since the unit doesn't lock
> >> to as many satellites as my Lucent with the newer Oncore, it took
> >> quite a while for the survey to finish.
> >>
> >> I just got home from work and this is what I am seeing:
> >>
> >> https://dl.dropboxusercontent.com/u/19599147/Z3801A.png
> >>
> >> The good news is that the unit no longer telling me the PPS is
> >> invalid. It looks like it will be another long while before it comes
> >> out of Recovery (assuming the PPS stays locked).
> >>
> >> I'm not the best at interpreting these graphs. At this point, should I
> >> be concerned abouth the spikey nature of the EFC graph, or will things
> >> calm down eventually? I assume that the PPS graph won't show until
> >> Recovery is done?
> >>
> >> If this unit loses PPS lock again, or otherwise acts up, then I would
> >> assume it is a hardware problem, and I'll have to put it on the bench.
> >>
> >> Joe Gray
> >> W5JG
> >> ___
> >> 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.
> >>
> >
> >
> > --
> > Dave
> > manu...@artekmanuals.com
> > www.ArtekManuals.com
> >
> > ---
> > This email has been checked for viruses by Avast antivirus software.
> > https://www.avast.com/antivirus
> >
> >
> > ___
> > 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.
> >
> ___
> 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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