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

paul swed paulswedb at gmail.com
Sun Nov 2 16:55:23 EST 2014


Good conversation
I am accurate in what I am saying about the z3801. Its off most of the time
so it is drawing against the the AA batteries most of the time. One more
note my bad, they are AAAs.
Like Bob says most likely self discharge and such will get them first. No
matter they get changed next year anyhow since I really don't want to enjoy
some leakage and it takes just a few easy seconds to change while the
system is on.

I may have missed it but was curious on the 15 pin cable if it was 1 to 1.
Regards
Paul
WB8TSL



On Sun, Nov 2, 2014 at 4:20 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> It’s those little onboard batteries that I have the experience with. After
> a while, you are doing well to get a month out of them. Play for a bit
> longer and they are down to a couple weeks. That’s not a surprising thing,
> the charging circuit on some of this stuff is often less than perfect. You
> get a lot of cycles / long life out of a properly handled battery. Abuse
> the poor thing and not so long a life.
>
> Bob
>
> > On Nov 2, 2014, at 4:12 PM, GandalfG8--- via time-nuts <
> time-nuts at febo.com> wrote:
> >
> > 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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