[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

GandalfG8 at aol.com GandalfG8 at aol.com
Sun Nov 2 16:12:38 EST 2014


Ah, just found an Engineering Note in my files that again quotes 5uA at  
2.5V but also quotes 100uA at 5.0V, perhaps not too relevant at 3.1V but 
that's  quite an increase.
 
The same document quotes the following specs for the optional onboard  
lithium battery...
 
Voltage -- 3V
Capacity -- 15mAh
                  approximately  3 months between charges
Recharge -- approximately 8 hours for a full charge
Lifetime -- 5 Years minimum.
 
So I guess an onboard battery conversion might still be a viable  option.
 
Regards
 
Nigel
GM8PZR  
 
 
In a message dated 02/11/2014 21:01:55 GMT Standard Time, kb8tq at n1k.org  
writes:

Hi

So then the question becomes - What is the real cutoff  voltage?

Your pair of AA’s will start off at 3.1V, but they will get to  2.5 long 
before they are truly dead. Is the RAM gone at 2.5000 or 2.4 or  “about 2 volts
” ….

Bob

> On Nov 2, 2014, at 3:54 PM,  GandalfG8--- via time-nuts 
<time-nuts at febo.com> wrote:
> 
>  Hi Bob
> 
> The UT+ data sheet from 1998 quotes an external backup  supply of 2.5 to  
> 5.35V with a drain of 5uA typical at 2.5  Volts.
> 
> Regards
> 
> Nigel
> GM8PZR
>  
> 
> In a message dated 02/11/2014 20:41:44 GMT Standard Time,  kb8tq at n1k.org  
> writes:
> 
> Hi
> 
> The  numbers quoted earlier (and they sound right) were 20  uA at 2.5V. 
That  
> would be well under your 100uA. My *guess* is that self   discharge / 
aging 
> on a normal AA is going to limit things faster than  a 20 uA  drain. 
> 
> Now, if you have the more normal tiny  coin cell involved  with  1/10 or 
> 1/100 that capacity and  much lower self discharge  ….
> 
> Bob
> 
>>  On Nov 2, 2014, at 3:17 PM, Hal Murray  <hmurray at megapathdsl.net>  
wrote:
>> 
>>> By the way the  z3801 is off most of  the year so the drains quite 
small.
>> 
>> I  think  that's backwards.  The battery is only used when there is no 
>  power  to 
>> the GPS module.
>> 
>> AAs are  roughly 2800 mA  hours.  There are 8760 hours in a year.   
That's 
> 319 
>> microamp years.  (How's that for a SI  unit?)  So that's 3 years if  
your 
> GPS 
>> module  takes 100 uA.  I think that's way high.   Anybody measured  it?  
> There 
>> is probably a strong temperature   component.
>> 
>> 
>> -- 
>> These are my  opinions.   I hate spam.
>> 
>> 
>>  
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