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

[Bob Camp]

Hi

The 15 pin cable is:


Pair 		End A		End B

A		1			9
B		2			10
C		3			11
D		4			12
E		5			13
F		6			14
G		7			15

ground 	8			8

C above appears to be a CMOS signal.
My guess is that D is 1/2 of an RS-422 pair.

The rest are a “to be discovered” at this point. 

Treasure map (all voltages approximate):

2.5 V = RS-422 input
1.5 V = RS-422 output
3.5 V = RS-422 output (other half of the pair)
O or 5 V = CMOS output 

Bob

> On Nov 2, 2014, at 4:55 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> 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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