MFJ-266B HF/VHF/UHF Antenna Analyzer
Instruction Manual
2012 MFJ Enterprises, Inc.
Version 1D
3
2.2 External Power Supply
To operate the MFJ-266B on an external power supply open up the unit
and move the EXT PWR-BAT jumper from to EXT PWR. The MFJ-
266B will not run on external power and batteries at the same time.
Powering the MFJ-266B 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-266B! 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.