KX3 Charging question

[Gerry Miller]

My KX3 is acting strange while charging.  Near the end of the charge cycle, the display starts to flicker between the remaining charge time and "LO SPPLY".  Any idea what the cause might be?
Gerry Miller, AA2ZJ
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[Matt Zilmer-3]

You might want to check the charging source voltage when this happens.
A low input voltage to the KX3 will cause LO SPPLY to pop up while
charging.

From p4 of the KXBC3's instllation manual, Error Message Table:
The external power supply voltage is too low for charging the internal
battery. If this occurs when trying to start a charging cycle, tap any
switch to clear the message. If this occurs during a charging cycle,
the charging cycle will resume automatically when the condition is
corrected.

73,
matt W6NIA


On Tue, 13 May 2014 22:18:45 GMT, you wrote:

>My KX3 is acting strange while charging.  Near the end of the charge cycle, the display starts to flicker between the remaining charge time and "LO SPPLY".  Any idea what the cause might be?
>Gerry Miller, AA2ZJ
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Matt Zilmer, W6NIA
--
"Give me six hours to chop down a tree and I will
spend the first four sharpening the axe." -A. Lincoln
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[Nr4c]

My guess is insufficient voltage "overhead" in the power supply as the charge nears the end.

Sent from my iPhone
...nr4c. bill

> On May 13, 2014, at 6:18 PM, "Gerry Miller" <[hidden email]> wrote:
>
> My KX3 is acting strange while charging.  Near the end of the charge cycle, the display starts to flicker between the remaining charge time and "LO SPPLY".  Any idea what the cause might be?
> Gerry Miller, AA2ZJ
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Please help support this email list: http://www.qsl.net/donate.html
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[DL6OAP]

Hi Gerry,

The charger is a constant current source (which adapts its voltage to supply a constant current) and my guess would be that, at the end of the charging process, the difference between the voltages of power supply and batteries is not high enough for the charger to supply its current.
Either the power supply voltage is not high enough or there is an additional voltage drop (higher than normal battery internal resistance or higher contact resistance in the battery holder perhaps?)

Greetings

Ralf, DL6OAP


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