[time-nuts] Oncore battery backup

[paul swed]

Really have to open the 3801 up and go find the magical header.

2011/4/6 Greg Broburg <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>  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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>>
>>
>
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