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GET LONGER BATTERY LIFE FROM YOUR
REGENCY MX-4000 OR MX-4200 SCANNER
by Bob Parnass, AJ9S
The discontinued Regency MX-4000 and MX-4200 are battery
operated, 20 channel scanners manufactured in Japan by
AOR. Both scanners contain a low battery warning circuit
which disables the scanner when the battery voltage falls
below a preset level.
A freshly charged battery pack should last at least 5
hours before needing a recharge. Ron Smithberg, of
Joliet, IL, complained of getting only 2 hours use from a
set of freshly charged NiCd batteries in his MX-4200.
This article describes how we increased his usage to over
7 hours between charges.
Both MX models are powered by a pack of 4 AA sized NiCd
batteries. The battery pack is nominally 4.8 volts and
has a rated capacity of about 500 mAh. The scanner draws
about 100 mA when squelched. A good rule of thumb is
that a NiCd should be recharged when its voltage falls
below 1.0 volts per cell. Using this heuristic, the MX-
4200 battery pack should be recharged when it falls below
4.0 volts under load.
CONTINUED IN FILE MX4000.3