MFJ-266B HF/VHF/UHF Antenna Analyzer
Instruction Manual
2012 MFJ Enterprises, Inc.
Version 1D
2
2.0 POWER SOURCES
The MFJ-266B may be powered with internal AA batteries or with an
external DC supply. To avoid needless damage and ensure top
performance, please follow the guidelines below when choosing a
voltage source.
2.1 Internal Batteries
To access the jumpers and battery compartments, remove all four screws
securing the analyzer's back cover and carefully open the case. To
operate the MFJ-266B on batteries put the EXT PWR-BAT jumper on
the PC board in the BAT position and install the batteries.
Battery power requires 4 (four) AA-size 1.5-volt alkaline cells. Batteries
are installed in a fully encased 4-cell plastic trays mounted inside the
analyzer enclosure. Slide the battery box covers sideways to unlatch, and
then lift vertically to expose the cells.
Slide and
Lift
When replacing old batteries, be sure to follow the manufacturer's
environmental guidelines for safe disposal. For longest battery life,
always replace with a matched set of factory-fresh cells. The MFJ-266B
will not charge batteries in the AA cell pack. Do not use rechargeable
AA cells in the pack.
The MFJ-266B can also hold an optional rechargeable 18650 battery.
This battery is inserted into a holder that is at the bottom of the case.
Disassemble the case as listed above and insert the battery into the holder
making sure the polarity is correct. This battery is recharged from the
external supply through a special charging circuit built into the MFJ-
266B. Charging time is about 10 hours using the MFJ-1312B. The
18650 battery will only
charge when the MFJ-
266B is off. For
charging the position of
the EXT PWR-BAT
jumper does not matter.
It will charge in either
position.
To switch between the
AA cell pack and the
rechargeable
18650
unplug the 3 pin header
from the AA cell pack and plug in the 3 pin header from the 18650 pack.