[Elecraft] My KX3 Battery Approach

[hb9brj]

Using 8 internal eneloop cells, I measured battery voltage versus current (as
shown on the KX3 display) during RX and different TX pwr levels, created an
Excel scatter chart and fitted a linear trend line. The result: 1.15 Ohms,
R^2 = 0.95.

A single eneloop cell has around 0.035 Ohms of internal resistance (measured
with a 4-connector battery DC resistance meter forcing current pulses thru
the cell under test).

My conclusion: 25% of the 1.15 Ohms are due to the 8 cells, 75% originate in
the battery holder and additional wiring.

Markus HB9BRJ



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