[time-nuts] Oncore battery backup

[Greg Broburg]

 From XTOncore Engineering Note

"Keep Alive" BATT Power . 4.75 - 16 Vdc; 0.3 mA (max) or
. 3V onboard battery; 15 uA typ., 60 uA max.

 From UT Plus

Backup Power
Externally applied backup power
Voltage 2.5V to 5.25V
Current 5 μA typical @ 2.5 V
100 μA typical @ 5.0 V
Optional Lithium Battery

Onboard rechargeable cell is charged when main power is on
Voltage 3 V
Capacity 15 mAh
approximately 3 months between charges
Recharge approximately 8 hours for a full charge

 From GT

. External 2.5 Vdc to 5.25 Vdc; 5 mA (typ.) @ 2.5 Vdc






On 4/6/2011 2:51 PM, paul swed wrote:
> Really have to open the 3801 up and go find the magical header.
>
> 2011/4/6 Greg Broburg <semiflex at comcast.net <mailto:semiflex at comcast.net>>
>
>     I would vote for a lithium AA.
>
>     Something like a Tadiran TL5104 3V6 @ 2A10 hrs
>
>     Greg
>
>
>     On 4/6/2011 2:43 PM, Chris Albertson wrote:
>
>         I remember reading in one of the docs I have for the Oncore that
>         Motorolla recommended a battery over a cap mainly for practical
>         reasons.  But now all I can find is some basic specs for what
>         you need
>         to conect to pin-1 on the header
>
>         BATTERY (Externally applied backup power)
>         Voltage:   2.5 V to 5.25 V
>         Current:   5 μA typical @ 2.5 V
>                    100 μA typical @ 5.0 V
>
>
>         On Wed, Apr 6, 2011 at 12:54 PM, Joseph Gray<jgray at zianet.com
>         <mailto:jgray at zianet.com>>  wrote:
>
>             Yes, a UPS isn't the most efficient method of running the
>             GPSDO. It
>             was an expedient until the day I run it on batteries.
>
>             As for backing up the Oncore, power outages are not the
>             only reason. I
>             may need to power down the GPSDO to add mods or other
>             reasons may
>             arise. Having the almanac stored will help.
>
>             I would still like to know if using a supercap is ok. They
>             are made
>             for memory backup, so why couldn't I use one for the
>             Oncore? I have a
>             few different values on hand.
>
>             Joe Gray
>             W5JG
>
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