For fixed-station use, a low-noise 12-14 VDC
power supply or battery is recommended. (See
linear and switching power supplies in the
Glossary, pg. 49.) For lightweight portable
operation, the KX3’s internal 8-AA-cell battery
pack can be used. See Internal Batteries, pg. 23.
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Recommended Battery Types
Lithium non-rechargeable batteries (e.g., Energizer
L91) are expensive, but their flat discharge curve
and 3 amp-hour rating provides maximum operating
time. In receive, the pack voltage will be about 12
V. In transmit, it will drop to 9-10 V due to the
cells’ high internal series resistance. This voltage is
sufficient for operation at up to 5.0 W.
NiMH (nickel-metal hydride) batteries have a flat
discharge curve, like lithium cells, but a lower pack
voltage (typically 10 V receive, 8.5-9 V transmit).
Power output of 5.0 W is possible. The advantage
of NiMH cells is that they can be recharged
hundreds of times, either externally (in as little as 1
to 2 hours), or internally (typically 8-12 hours,
using the KXBC3 option module).
Alkaline batteries can be used if there’s no other
alternative, but they have several disadvantages.
They should always be used with power output set
to 3.0 W or less to minimize transmit current drain.
They have a steep discharge curve, so the pack will
drop from 12 V to 8 V in about half the time of
Lithium or NiMH cells. They’re also prone to
leakage, and should be removed after use.
Damage caused by battery leakage is not
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