MFJ-266C HF/VHF/UHF Antenna Analyzer
Instruction Manual
Version 2A
3
2012 MFJ Enterprises, Inc
18650 pack.
2.2 External Power Supply
To operate the MFJ-266C on an external power supply open up the unit and
move the EXT PWR-BAT jumper from to EXT PWR. The MFJ-266C will
not run on external power and batteries at the same time.
Powering the MFJ-266C externally requires a well-filtered 12V DC supply
such as the MFJ-1312D capable of delivering
12
to
15 VDC
under varying
load conditions. Current drain ranges from 30 mA to 180 mA, depending on
operating mode, frequency range, and whether or not the display backlight is
on. The unit's external power jack is located on the front panel and accepts a
standard 2.1-mm power plug.
Positive voltage (+) must be applied to the
connector's center pin
.
+
-
+
-
2.1 mm
Important Warnings: Reverse polarity or excessive voltage could
permanently damage the MFJ-266C! To avoid damage:
1. Never connect an AC transformer or positive-ground power source
2. Never install or remove batteries with external power connected
3.0 OPERATING MODE
Once you have suitable power (battery or external), you're ready to explore
the analyzer's basic operating features. Begin by pressing the red
PWR
button on.
BAND-MODE
SELECT
Up Down
ANT Counter
Bk Lite
PWR
ON
OFF
3.1 Display Backlight
When the analyzer comes on, the screen displays a brief 1-second prompt
before automatically switching to the main menu. This prompt allows you to
turn on the optional display backlight. If you elect to use it, press the
Up
button
immediately,
before the screen changes to the main menu and hold it
down until the backlight comes on. If you ignore the prompt, the backlight
will remain off. Off is the default setting to reduce battery drain.
