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 <[email protected]> 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 <[email protected]> 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 < >> [email protected]> 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, [email protected] >>> 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 >>> <[email protected]> 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, >> [email protected] >>>> 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 <[email protected]> >>> 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. >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
