[Elecraft] KX3 won't go above 10W

[Mark Goldberg]

Go with LiFePO4 cells. Four cells will keep the voltage between 12 and 14.4
V from 10% to 100% state of charge and most of the time the voltage is
between 13 and 13.5 V. I use small ones (3 AH )for backpack portable
operation, 20 AH for fixed portable and my RV has 400 Ah to run the rig
forever! The KX3 stays at the max 15W almost all of the time. No fuss, just
works, and they keep their charge for months. Small ones start at about $50.

Regards,

Mark


On Mon, Jun 24, 2019 at 12:40 PM Fred Soop <fgstcf at gmail.com> wrote:

> I have looked at the power issue (even though I'm not yet a KX3 owner) and
> with NiMH cells at 1.2 V, the 8 cell internal battery holder would only be
> 9.6 V. I'm considering an external battery pack with (2) 6 cell holders for
> 12 cells total. That would be 14.4 V total. A single series diode would
> bring that down to 13.7 V. The NiMH cells do start at 1.5 V with full
> charge for a short time, so some additional series diodes would be needed
> with a fresh charge and could be switched out as the cell voltage drops to
> 1.2 V. A voltmeter and rotary switch with 5 diodes would do the job.
>
> 73
> Fred Soop AC9RQ
>
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