MFJ-269D Instruction Manual LF/HF/VHF/UHF SWR Analyzer
6
Never attempt to charge alkaline (or any other non-rechargeable cells) using the MFJ-269D's internal
charger circuit!
2.5 “Voltage Low” display warning
When the analyzer's supply or battery voltage drops below 11 volts, a blinking Voltage Low warning
will be displayed. Pressing Mode during a low-voltage warning will disable the on-screen alert and allow
you to continue operating. However, measurements may not be reliable when operating the analyzer with
insufficient supply voltage!
2.6 Sleep Mode “Power Saving”
Typical current drain for the MFJ-269D is around 150 mA for HF operation (250 mA for UHF). Battery
operating time is (by default) extended significantly through the use of Sleep Mode. Sleep mode reduces
current drain to less than 15 mA when it is engaged during periods of non-activity. Power-saving is a
default setting for the MFJ-269D unless you defeat it when you turn on the analyzer (instructions below).
Normally, the analyzer's processor looks for manual activation of the Mode switch or for any change in
Frequency greater than 50 kHz. If neither event occurs during any given three-minute interval, Sleep
mode automatically kicks in and places the analyzer in standby. A blinking SLP message in the display
screen lower-right corner indicates power-saving mode (see below):
To pull the unit out of SLP, momentarily press either the Mode or Gate button to resume operation.
To disable Sleep, first turn the unit Off and then press and hold the Mode button when reapplying
power. Continue holding Mode until after the copyright message appears on the LCD screen, then
release. If the “Power Saving” mode has been is successfully disabled, the message shown below will
appear as soon as Mode is released.
Sleep Mode is a default function and will reset automatically each time the analyzer is turned OFF. To
restore Sleep, simply turn the analyzer Off and then On again.
3.0 MAIN MENU AND DISPLAY
WARNING: NEVER APPLY RF OR ANY OTHER EXTERNAL VOLTAGE TO THE ANTENNA PORT.
THE MFJ-269D USES ZERO BIAS DETECTOR DIODES THAT MAY BE DAMAGED BY
EXTERNAL VOLTAGES. ALSO, READ SECTION 2.0 BEFORE APPLYING POWER.
INCORRECT SUPPLY VOLTAGE OR REVERSED POLARITY CAN CAUSE DAMAGE.
3.1 General Connections
The N-female Antenna connector on top of the unit is the primary RF-measurement connection. It is
used for all functions except frequency counter measurements.
The Power connector (2.1 mm) is described in section 2.0. Please read the power-source section
carefully before attempting to operate the analyzer! Improper voltage application, the wrong battery
charger setting, or reversed polarity could permanently damage your unit.
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