[time-nuts] Re: Symmetricom XLi question

[Mark G Thomas]

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 BOOTLOADERÂ  192-8000
 Â Â Â  SOFTWAREÂ Â Â  192-8001
 Â Â Â  FILE SYSTEM 192-8002V2-4
 Â Â Â  PROJ REV #Â  2-4
 Â Â Â  FPGA #Â Â Â Â Â  184-8000V65

 >F72
F72 CLOCK PLLÂ Â Â Â Â Â Â Â Â Â Â Â Â  LOCKED
 Â Â Â  CLOCK STATUSÂ Â Â Â Â Â Â Â Â Â  UNLOCKEDÂ Â Â  GPS PRI
 Â Â Â  PRIMARY POWER SUPPLYÂ Â  OK
 Â Â Â  SECONDARY POWER SUPPLY OK
 Â Â Â  RUBIDIUM OSCÂ Â Â Â Â Â Â Â Â Â  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