I did the same to extend the back up time of a couple servers, I used 2
car batteries because the UPS runs on 24 V.
But be careful, aside for the live battery connection (I couldn't figure
it out and learned that in the rude way, 220 V here), you can go into
another problem: some UPSs, mainly th
700
> From: WB6BNQ
> To: Discussion of precise time and frequency measurement
>
> Subject: Re: [time-nuts] Oncore battery backup (answer to question)
>
>
> First, which Oncore receiver is he using ? If it is the older series such as
> a GT+ or UT+ they are designed
To effectively charge a battery it needs a given amount of current for the
plate area.
Thats why larger batteries actually start in constant current mode.
We are getting slowly but surely off topic.
Regards
On Wed, Apr 6, 2011 at 5:13 PM, Hal Murray wrote:
>
> paulsw...@gmail.com said:
> > The c
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
Onbo
paulsw...@gmail.com said:
> The charger does not deliver enough current to effectively charge the
> battery set if its larger then the original design. As such the battery life
> is effected up to 50% and certainly the operating capacity.
I'm missing something. I'd expect it to just charge slowe
percap. It will directly replace the ni-cad Just make
> sure the voltage rating is high enough, e.g. 5V
> Ebay item 160495558462 looks good.
>
> Robert G8RPI.
>
> --- On Wed, 6/4/11, Joseph Gray wrote:
>
> From: Joseph Gray
> Subject: [time-nuts] Oncore battery backup
>
Really have to open the 3801 up and go find the magical header.
2011/4/6 Greg Broburg
> 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 th
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 so
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 5.2
Well some good comments about the UPS ability to handle the heat from
running for a long time. Absolutely true. The charger does not deliver
enough current to effectively charge the battery set if its larger then the
original design. As such the battery life is effected up to 50% and
certainly the
On 4/6/11 11:25 AM, Murray Greenman wrote:
Why not just put a bigger battery in your UPS? I have a couple of old
ones, and they run just fine with an old car battery, and thus give me
many hours of backup for my Trimble/Nortel GPSDO.
Just be careful though - in some UPS units the battery is live
paulsw...@gmail.com said:
> The chargers on the small UPS's 70-100 watt class are not really set up to
> do a good job on a much larger battery set.
What's the problem and/or what do the larger units do differently?
--
Several/many years ago, I got a UPS when somebody on this list (I th
Hi Joe,
Yes you can use a supercap. It will directly replace the ni-cad Just make sure
the voltage rating is high enough, e.g. 5V
Ebay item 160495558462 looks good.
Robert G8RPI.
--- On Wed, 6/4/11, Joseph Gray wrote:
From: Joseph Gray
Subject: [time-nuts] Oncore battery backup
To
You could. But its funny I have been reading over the last year or so thats
its actually not simply attaching a resistor and diode to charge the super
cap effectively. Yes it will charge but to what effective level.
Give it a try if it works it works hopefully well enough. Me I just need to
find th
Oh there you go.
You have made me think. Indeed there are commands that would easily be sent
from a small basic language program on a Basic stamp or SXB or Pic etc etc.
I think its only 2-3 commands also.
But I just need to get off my *()& and add the battery before getting silly.
Regards
Paul
On
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 h
On Wed, Apr 6, 2011 at 11:25 AM, Murray Greenman
wrote:
> Why not just put a bigger battery in your UPS? I have a couple of old
> ones, and they run just fine with an old car battery, and thus give me
> many hours of backup for my Trimble/Nortel GPSDO.
Because with an Oncore you can't even move i
At 12:15 PM 4/6/2011, Jim Lux wrote...
Isn't your real problem going to be that the oven on the oscillator
has cooled off? Or does the GPS lose the whole almanac, so the time
to first fix is forever?
The more significant problem is that it loses its surveyed position, so
it takes even more
My 2 cents is that a UPS is very inefficient on power conversion. If all you
want to do is preserver the almanac. Lets say a 10 ua need. If on the other
hand you want to keep everything running then larger batteries make sense.
Accept for one gotcha. The chargers on the small UPS's 70-100 watt clas
Why not just put a bigger battery in your UPS? I have a couple of old
ones, and they run just fine with an old car battery, and thus give me
many hours of backup for my Trimble/Nortel GPSDO.
Just be careful though - in some UPS units the battery is live to the
mains! The APC ones seem to be OK.
M
On Wed, Apr 6, 2011 at 9:00 AM, Joseph Gray wrote:
> Recently, the local area had an extended power outage. I have the
> Z3801A on a UPS, but the outage lasted over an hour and the UPS
> didn't. I have the information about adding a battery to the Oncore to
> allow for faster startup. Is it safe t
This will be interesting.
I have not added a battery to my 3801. Have the same issue annoying but in
general not enough to get me to do something.
But believe it may be as simple as taking a cr3026 lithium as an example and
holder.
Slap it on the back and change the battery every so often. Doing s
> Isn't your real problem going to be that the oven on the oscillator has
> cooled off? Or does the GPS lose the whole almanac, so the time to first
> fix is forever?
Yes, the Oncore looses the almanac.
Joe Gray
W5JG
___
time-nuts mailing list -- time
On 4/6/11 9:00 AM, Joseph Gray wrote:
Recently, the local area had an extended power outage. I have the
Z3801A on a UPS, but the outage lasted over an hour and the UPS
didn't. I have the information about adding a battery to the Oncore to
allow for faster startup. Is it safe to use a supercap ins
Recently, the local area had an extended power outage. I have the
Z3801A on a UPS, but the outage lasted over an hour and the UPS
didn't. I have the information about adding a battery to the Oncore to
allow for faster startup. Is it safe to use a supercap instead of a
battery?
Joe Gray
W5JG
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