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Battery Installation 

• 

When the batteries in the MFJ-124 become drained, a low battery symbol will 
appear on the LCD display. 

• 

Remove the battery cover (8) and insert two fresh AAA batteries.  Be sure to insert 
the batteries with the correct polarity as shown inside the battery compartment. 

• 

Replace the battery cover (8) after installing the new batteries. 

 

Initial Start-Up 

After inserting new batteries into the MFJ-124, the clock will automatically begin searching 
for the radio signal.  The LCD display (6) will initially read: 

• 

L:0~5: This indicates the strength of the signal received.  Level 5 indicates the 
signal strength is OK.  Levels 0~4 indicate the signal is weak. 

• 

00~59: seconds counting. 

• 

OFF: Alarm off mode. 

• 

The receiving tower symbol will begin to blink.  This indicates the MFJ-124 has 
entered the time signal receiving mode. 

 

If the MFJ-124 has received and locked into the signal, the tower symbol will stop 

blinking and remain steady.  The LCD display (6) will show the correct time and continue 
working.  The MFJ-124 will search for the time signal four times a day to auto-adjust the time 
and date. 
 

If the MFJ-124 is out of the signal area and cannot receive time signal, the MFJ-124 must 

be set manually.  Please follow the instructions under Manual Time Setting. 
 

Time Zone Setting 

• 

Hold the SET button (5) for two seconds to enter the set mode.  Press the SET 
button (5) four times to enter the time zone setting mode.  When the LCD display 
(6) shows the map flashing, press the ? (2) or ? (4) buttons to select your US time 
zone. 

• 

To enter the Daylight Savings Time Set-up, press the MODE button (1) while the 
map is still flashing.  Press the ? (2) or ? (4) buttons to turn this feature on or off. 

• 

To enter the Hour Offset Set-up, press the MODE button (1) again.  Press the ? (2) 
or ? (4) buttons to select the offset.  The offset can be adjusted between –12 to +12 
hours offset. 

• 

To return to the normal clock display mode, press the MODE button (1) or the SET 
button (5) once. 

 

Manual Date Setting 

• 

To set the year, month, and date manually, press and hold the SET button (5) for 2 
seconds. 

• 

Year will begin to flash on the LCD display (6).  Press the ? (2) or ? (4) buttons to 
change the year. 

• 

Press the MODE button (1) once and the month will begin to flash.  Press the ? (2) 
or ? (4) buttons to change the month. 

• 

Press the MODE button (1) again and the date will begin to flash.  Press the ? (2) or 
? (4) buttons to change the date. 

 
 
 

Manual Time Setting 

• 

To set the time manually, press and hold the SET button (5) for 2 seconds. 

• 

When the year begins to flash, press the SET button (5) once.  The hour digits will 
begin to flash. 

• 

Press the ? (2) or ? (4) buttons to change the hour. 

• 

Press the MODE button (1) once and the minute digits will flash.  Press the ? (2) or 
? (4) buttons to change the minutes. 

• 

Press the MODE button (1) to return to normal time display. 

 

Alarm Setting 

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To set the alarm, press and hold the SET button (5) for 2 seconds. 

• 

When the year begins to flash, press the SET button (5) two times to set ALARM 1.  
The 

U

 1 symbol will be displayed and the hour digits will begin to flash. 

• 

Press the ? (2) or ? (4) buttons to change the hour. 

• 

Press the MODE button (1) once and the minute digits will flash.  Press the ? (2) or 
? (4) buttons to change the minutes.  

• 

Press the MODE button (1) to return to normal time display or press the SET button 

(5) again to set ALARM 2.  The 

U

 2 symbol will be displayed and the hour digits 

will begin to flash. 

• 

Press the ? (2) or ? (4) buttons to change the hour. 

• 

Press the MODE button (1) once and the minute digits will flash.  Press the ? (2) or 
? (4) buttons to change the minutes. 

• 

Press the MODE button (1) to return to normal time display. 

 

Selecting 1-5 Alarm / 1-7 Alarm 

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Press the 1-5/1-7 Alarm button (3) to toggle between the 1-5 or 1-7 alarm. 

 

12/24 Hour Format 

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Press and hold down the SNOOZE/LIGHT button (7) for 5 seconds to toggle 
between 12 Hour time display and 24 Hour time display. 

 

Backlight 

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Press the SNOOZE/LIGHT button (7) once.  The LCD display will be illuminated 
for 5 seconds. 

 

WARNING

 

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This clock is designed for consumer use and not a scientific instrument.  The success 
of time reception is not guaranteed and subject to the condition of the environment 
and distance from the signal source. 

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This clock is designed for indoor use only. 

• 

Please avoid exposure to high humidity, high temperatures, vibration, shock, and 
direct sunlight. 

 

FCC Statement 

The MFJ-124 might cause TV or radio interference when operating properly.  To 

determine whether the MFJ-124 is causing interference, take out the batteries to turn it off.  If 
the interference goes away, the MFJ-124 is causing the interference.  Try to eliminate the 
interference by reorienting the MFJ-124 and/or increasing the separation between your 
equipment and the MFJ-124.  If you cannot eliminate the interference, the FCC requires that 
you stop using the clock.

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