[time-nuts] Re: Symmetricom XLi question

[Steve Krull]

Mark,

My XL took a good 24 hours to lock after it had been unpowered for who knows how long and moved half way across the country. It also has the 87-8028-2 gps receiver and was not affected by the week 1024 rollover. 
It’s a shame if the rb is dead; as many have said there’s no information on them.

If anyone has one to let go of, I am looking for an 87-8028-2 gps receiver for an XLi SAASM that I got without the receiver. A list member offered me one pre-pandemic but he  then seems to have gone silent. 

Steve K.

> On Sep 21, 2022, at 1:34 PM, Mark G Thomas via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hi,
> 
> I just received an XLi from e-bay. It unexpectedly has the Rubidium standard, in addition to the GPS receiver 87-8028-2.
> 
> I have not yet determined if my 87-8028-2 is affected by the week 1024 rollover bug. After 12 hours it has finally transitioned from "SITE SURVEY" to "TRAIM ACTIVE", but still not GPS locked.
> 
> Claude -- which exact Jackson Labs part did you use?
> 
> Unfortunately the X72 RUBIDIUM OSC is in FAULT state.
> 
> I am interested in any recommendations about what to do about the failed rubidium. My next steps will be to check supply voltages and pull out the 87-8028-2 to see which GPS module it has, but I was hoping it would get GPS lock before I shut it down again.
> 
> >F18
> F18 BOOTLOADER  192-8000
>     SOFTWARE    192-8001
>     FILE SYSTEM 192-8002V2-4
>     PROJ REV #  2-4
>     FPGA #      184-8000V65
> 
> >F72
> F72 CLOCK PLL              LOCKED
>     CLOCK STATUS           UNLOCKED    GPS PRI
>     PRIMARY POWER SUPPLY   OK
>     SECONDARY POWER SUPPLY OK
>     RUBIDIUM OSC           FAULT
> 
> >F108
> F108 OSCILLATOR CONFIG RUBIDIUM
> 
> >f60 b1 tracked
> F60 B1 prn2 good tracked -153dBW
> F60 B1 prn5 good tracked -154dBW
> F60 B1 prn6 good tracked -155dBW
> F60 B1 prn9 good tracked -157dBW
> F60 B1 prn11 good tracked -154dBW
> F60 B1 prn12 good tracked -154dBW
> F60 B1 prn13 good tracked -196dBW
> F60 B1 prn19 good tracked -162dBW
> F60 B1 prn20 good tracked -154dBW
> F60 B1 prn25 good tracked -156dBW
> F60 B1 prn29 good tracked -156dBW
> 
> >f60 b1 current
> F60 B1 prn2 good current -154dBW
> F60 B1 prn5 good current -154dBW
> F60 B1 prn6 good current -155dBW
> F60 B1 prn9 good current -158dBW
> F60 B1 prn11 good current -153dBW
> F60 B1 prn12 good current -155dBW
> F60 B1 prn20 good current -154dBW
> F60 B1 prn25 good current -157dBW
> F60 B1 prn29 good current -156dBW
> 
> Mark
> 
> 
>> On 11/25/21 5:45 PM, va2hdd at ebox.net wrote:
>>  
>> Hi Martin.
>> 
>> In my XLi the GPS is in option bay 1.
>> 
>> As far as I know you can put it in any free option bay, you will
>> configure it in software at start up.
>> 
>> In my case I had to replace the GPS receiver that was on the 87-8028-2
>> option card, there was a week 1024 rollover bug issue on it.
>> 
>> Personally I would take the time to test it with an antenna, as the late
>> production units have a more recent GPS receiver card that has no
>> rollover bug.
>> 
>> In my case I used the Jackson Labs replacement board, and I warmly
>> recommend it, it works flawlessly.
>> 
>> Have fun with your XLi !
>> 
>> Claude VA2 HDD
>> 
>>> On 2021-11-25 16:41, Martin Flynn wrote:
>>> Picked up a Symmetricom XLi with two A/C supplies and two empty slots.
>>> 
>>> Question #1
>>> Is there a preference which of the two empty slots the GPS C/A
>>> Receiver (87-8028-2) is placed in?
>>> 
>>> Question #2
>>> 
>>> Anyone have slot covers sitting around?
>>> 
>>> Martin
> 
> -- 
> Mark G Thomas <Mark at Misty.com>, KC3DRE
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