What do the "@" signs mean?
And what is FFF?

I have never seen these used before.

Glenn

On 9/3/2019 11:16 AM, victor smith wrote:

@Steve H., great story...
@Paul B : I got what appears to be FFF identical to the original battery here:??

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license" 

At 2019-09-02 04:50 PM, Richard Knoppow wrote:

?? Assuming the battery test shows the voltage under load I wonder if the old battery got noisy. Batteries do sometimes. I was taught that putting a capacitor across a battery may be good practice because it shorts out the noise. Perhaps does not apply to this device.

This may or may not be relevant to your situation, but I recall a bizarre problem quite a while back (this would have been in the late 1980's) where a purchased CPU board we used in a design as a subcontractor to a prime contractor for NASA, used a primary lithium coin cell as a memory backup battery. After the unit ran continuously and flawlessly for a couple of months, at somewhat elevated temperatures, it started having random resets, becoming worse over time, until it wouldn't boot at all. Since it took months to duplicate, you can well imagine it was tedious to troubleshoot.

It turned out that the designers of that CPU board also used the backup battery as a reference voltage for the power-fail comparator. Running at elevated temps (around 100F / 30C or thereabouts as I recall), the diode used to switch in the backup battery leaked about 1 ?A. This was enough to slowly "charge" the non-rechargeable battery, causing its output voltage to slowly rise, over a period of months. Eventually it got high enough to make the comparator see the main supply voltage pretty close to the reference, and all it took was a little noise to trigger a power-fail reset. As the battery voltage continued to rise, it took less and less noise, so resets became more frequent until they became continuous.

IIRC our solution was to add a 1 megohm resistor across the battery, guaranteeing that it was never charged by diode leakage. This of course meant that under most conditions it had a slightly increased discharge rate, but the battery was way over-specified, with a theoretical lifetime in centuries, so we didn't care about the additional discharge.

Steve Hendrix

There were no Republicans when The United States of America was founded, so how can it be 'Republican Politics'?.

On Mon, Sep 2, 2019 at 9:14 PM Richard Hill via Groups.Io <primemage=[email protected]> wrote:

Why are we mixing politics on a tech board??

Especially republican politics?

On Mon, Sep 2, 2019 at 21:05, jyelmgren

<jyelmgren@...> wrote:

the electoral college was not a quirk but an effective design for a Republic so that even the smallest of States has some voice and? impact ...other wise they never would have joined to start with.

even over two hundred years ago it was intended to balance out the less populated states ( or colonies at the time ) with the few heavily populated ones.

Everyone thinks we are a democracy ....we are not ...it's a Republic.? That's how it's supposed to work as opposed to being a quirk.


?

There was an engineering change at some point in the production of these that resulted in premature death of the RAM Battery. Subsequently a fix was released to correct that.



(In case you hadn't already known about this)

regards

Vic