[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system

Bob Camp kb8tq at n1k.org
Fri Oct 31 22:22:13 EDT 2014


Hi

I sort of doubt that a GPS aux supply is quite that low current. I have seen some RTC’s that won’t last a month on a coin cell. My recollection is that the Oncore backup is closer to that category than the “many years on a cap” group.

Bob


> On Oct 31, 2014, at 9:26 PM, Brooke Clarke <brooke at pacific.net> wrote:
> 
> Hi Bob:
> 
> When HP came out with the 300 series Rocky Mountain Basic computers they were fitted with a super cap to power the RTC.
> I will keep time for some months.
> http://www.prc68.com/I/HPIB.shtml#300
> 
> Mail_Attachment --
> Have Fun,
> 
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
> http://www.prc68.com/I/DietNutrition.html
> Bob Camp wrote:
>> Hi
>> 
>> The ultra cap is a pretty small one (physical small). You might be able to find a larger (more farads) one that would fit in the same space. It’s not going to help for a hours and hours sort of outage. It might get you from dying in 15 minutes to dying in a half hour.
>> 
>> Bob
>> 
>>> On Oct 31, 2014, at 12:42 PM, Tom Miller <tmiller11147 at verizon.net> wrote:
>>> 
>>> I thought so too. There is an ultracap in each unit.
>>> 
>>> 
>>> Tom
>>> 
>>> ----- Original Message ----- From: "Mike Seguin" <n1jez at burlingtontelecom.net>
>>> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
>>> Sent: Friday, October 31, 2014 12:19 PM
>>> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
>>> 
>>> 
>>>> I have both of my units sitting on the bench. I found that I needed to connect them together to get the REF1 unit to come out of standby.
>>>> 
>>>> I am using GPSCon to monitor and it appears to work fine.
>>>> 
>>>> One thing on my units, when I power cycled them, it started a 'survey' over! I didn't expect that. Are others seeing this. There must be a way to store the surveyed position....
>>>> 
>>>> Tnx,
>>>> Mike
>>>> 
>>>> On 10/30/2014 3:59 PM, Bob Stewart wrote:
>>>>> Hi Anthony,
>>>>> Did you power cycle both units as part of connecting them together at J5 to J5?  And can you remind me whether you are using the supplied interface cable, or are you using something else?  After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit.  While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON.  There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
>>>>> 
>>>>> Bob     From: Anthony Roby <aroby at antamy.com>
>>>>>  To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
>>>>>  Sent: Thursday, October 30, 2014 2:24 PM
>>>>>  Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
>>>>> 
>>>>> I'm still having no luck with mine.  When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash.  When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
>>>>> 
>>>>> When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
>>>>> 
>>>>> Do you see the same?  I don't know what to infer from the Fault light since there is no supplemental data to work from.
>>>>> 
>>>>> Anthony
>>>>> 
>>>>> 
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>>>>> 
>>>> -- 
>>>> 
>>>> 73,
>>>> Mike, N1JEZ
>>>> "A closed mouth gathers no feet"
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