[time-nuts] Z3801A recovering

Tue Apr 26 18:39:56 UTC 2016

Joe,

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

http://www.synergy-gps.com/index.php?option=com_content&task=view&id=42&Itemid=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-bounces at 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 at 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 <wpxs472 at 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 <jgray at 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 
>> <Manuals at 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&data=01%7c01%
>> >> 7cart%40synergy-gps.com%7c806e79510b664f4468de08d36de38cd0%7cc81f9
>> >> fdec0e04d8c95779afaa0cad9ed%7c1&sdata=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 
>> >> 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
>> > Manuals at ArtekManuals.com
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>> >
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