La Crosse Technology WT-3143A User manual

User Manual of Product 1:
La Crosse Technology WT-3143A-INT 14-Inch Atomic Wall
Clock, Black
User Manual of Product 2:
La Crosse Technology Atomic Analog Wall Clock, 10", Silver

Model: WT-3143A www.lacrossetechnology.com/support Page | 1
Model: WT-3143A
Instruction Manual
DC: 031716
14” Atomic Wall Clock
Get Started
1: Slide the switch to select a time zone and DST ON or OFF.
2: Insert 1 freshAA, LR6 1.5 volt ALKALINE battery according to the polarity
marked on the case.
OPTIONAL: To extend battery life (over 3 years), insert two batteries in the
compartment below the movement.
3: For the best reception, please place clock on a wall that faces Ft. Collins,
Colorado. During the night, your clock will automatically set itself.
Note: The hands will move to the 12:00 position and search for the radio signal.
If the radio signal is not received in the first 10 minutes, the clock will start
running from the 12:00 position and will continue to run. Do not attempt to
reset the hands manually even though the time on the clock is incorrect. The
clock is synchronizing to the WWVB signal and once the radio signal is decoded,
the hands will automatically adjust to the correct time. This may take up to 5
nights if there is atmospheric interference.
Position Clock
•Signal reception is at its peak when there is only one wall or window
between the clock and the outside.
•The antenna is best positioned for signal reception when the front or back of
the clock faces Colorado.
•Choose a location 6 feet or more from electronics such as cordless phones,
wireless gaming systems, televisions, microwaves, routers, baby monitors,
etc., which can prevent signal reception.
•Large office buildings, schools, or hospitals may not receive the WWVB time
signal in every room.
Time Zone
DST ON/OFF

Model: WT-3143A www.lacrossetechnology.com/support Page | 2
•Building with a metal roof may interfere with reception.
Reset:If the clock does not respond to the various function modes, reset the
clock by pressing the RESET button on the movement case.
Manual Set Time
On rare occasions in certain areas, the clock may not be
able to utilize the radio controlled function because of the
strength of the signal or the geographic location. In this
case, the clock can be set manually and used as a regular
quartz wall clock.
Note: Allow up to five nights for the clock to receive the WWVB signal before
manually setting the time.
Set the clock manually:
1. Press and hold the SET button for 3+ seconds to activate the manual mode.
Once the clock is in manual mode, there are two ways to move the minute
hand forward.
2. Hold the SET button down to move the minute hand forward consistently.
3. Alternatively, press the SET button rapidly (more than once per second) to
move the minute hand forward step by step (in minute increments).
4. Use these features to move the minute hand forward until the correct time is
set. The clock will automatically leave manual mode after the SET button is
not pressed for 6+ seconds.
Troubleshooting
The wonderful advantage of owning a radio-controlled clock is that it is virtually
trouble free. If the clock receives a clear time signal, it will set itself perfectly. If it
does not receive a time signal, consider the following:
•Battery – The clock must have a fresh battery to receive and process the
time signal.
•Location – Try a different location, ideally near a window. Your clock should
be at least six feet from computers, TVs, air conditioners, other radio-
controlled clocks and other electrical appliances that cause interference.
•Weather – Electrical storms between you and Colorado during the night will
interfere with the WWVB signal.
Daylight Saving Time:
The National Institute of Standards and Technology and WWVB encode a special
DST “bit” in the WWVB transmission for DST. Your clock will read this information
and automatically advance the hands one hour in the spring and eleven hours in
the fall.
Arizona
If you live in an area that does not recognize DST, you must slide the DST switch
OFF. To reactivate the DST program simply slide the switch to the ON position.

Model: WT-3143A www.lacrossetechnology.com/support Page | 3
Manual WWVB Time Signal Search
For information about WWVB, visit: www.nist.gov/pml/div688/grp40/wwvb.cfm
Manual Signal Search:
The WWVB signal is strongest at night.
•Hold the WAVE button down for 3+ seconds.
•The hands will automatically reset to the 12:00 position, and the movement
will search for the WWVB time signal from Fort Collins, CO.
•If the movement successfully receives the signal, the clock will reset
automatically to the correct time. The signal search takes approximately 3-8
minutes.
•Set the clock manually, and the movement's micro-CPU will control the time
keeping function.
Internal Synchronization:
Once the clock has set correctly by the radio signal, the clock’s CPU operates
continuously. To ensure accuracy, the clock synchronizes the position of the
second and minute hands to the time calculated by the CPU every day. Second
hand synchronization occurs at 1:30 a.m. and 9:30 a.m. and minute hand
synchronization occurs between 1:50 and 2:01 am every day.
Signal Interference:
In some cases, the signal is affected by weather conditions and electrical
interferences, or the location of the clock itself may result in poor reception. If the
clock has not synchronized to the correct time within a few days of activation, you
may need to move the clock to a different location.
Frequently Asked Questions
Q. How long will the battery last?
A.One good AAalkaline battery will last over 12 months, and over 3 years with
the optional, 2 additional batteries.
Q: Can I wire a control timing circuit to the La Crosse Technology® atomic
clock?
A: No, the clock cannot work on a timing circuit. Opening the clock voids the
warranty.
Q: Is there a booster antenna to receive the WWVB signal in a difficult
location?
A: No, the clock cannot work with a booster antenna. Opening the clock or
movement voids the warranty.
Q: Can I shut off the WWVB signal?
A: No. If you manually set the time, when the clock receives a WWVB signal,
that signal will override the manual set. The WAVE button will temporarily
stop a WWVB search, but will not permanent stop the clock from receiving a
WWVB time signal.

Model: WT-3143A www.lacrossetechnology.com/support Page | 4
Q: Is there a version of analog clock with more than the four continental US
times zones?
A: La Crosse Technology® does not make an analog clock with more than four
time zones. These time zones are P (Pacific Time), M (Mountain Time), C
Central Time), and E (Eastern Time).
Q: Why do the hands spin?
A: When the hands spin about the same time every day the clock is auto-
correcting the time. The hour hand should not spin more than twice around
the clock.
A: Hands may spin if the battery is under powered or over powered. Use only
Alkaline batteries in the clock.
Care and Maintenance
•Do not mix old and new batteries
•Do not mix Alkaline, Standard, Lithium or Rechargeable Batteries
•Always purchase the correct size and grade of battery most suitable for
intended use.
•Replace all batteries of a set at the same time.
•Clean the battery contacts and also those of the device prior to battery
installation.
•Ensure the batteries are installed with correct polarity (+and -).
•Remove batteries from equipment which is not to be used for an extended
period of time.
•Remove expired batteries promptly.
Warranty and Support Information
La Crosse Technology, Ltd. provides a 1-year limited time warranty (from date of
purchase) on this product relating to manufacturing defects in materials &
workmanship.
Before returning a product, please contact our friendly customer support
with questions or visit our online help (manuals and FAQS):
Phone: [phone]
Online Product Support: www.lacrossetechnology.com/support
Product Registration:
www.lacrossetechnology.com/support/register
View full warranty details online at:
www.lacrossetechnology.com/warranty_info.pdf
Warranty Address:
La Crosse Technology, Ltd
2830 S. 26th St.
La Crosse, WI 54601

Model: WT-3102S www.lacrossetechnology.com/support Page | 1
Model: WT-3102S
Instruction Manual
DC: 033115
10” Atomic Wall Clock
Get Started
Step 1: Slide the switch to select a time zone.
Step 2: Insert 1 fresh AA, Alkaline battery according to the
polarity marked on the case.
Step 3: For the best reception, please place clock on a wall that
faces Ft. Collins, Colorado. During the night, your clock
will automatically set itself.
When the battery is installed, the hands will move to the 12:00
position and search for the radio signal.
If the radio signal is not received in the first 10 minutes, the
clock will start running from the 12:00 position and will
continue to run.
Do not attempt to reset the hands manually even though the
time on the clock is incorrect. The clock is synchronizing to
the WWVB signal and once the radio signal is decoded, the
hands will automatically adjust to the correct time. This may
take up to 5 nights if there is atmospheric interference.
Reset: If the clock does not respond to the various function
modes, press the RESET button on the movement case.

Model: WT-3102S www.lacrossetechnology.com/support Page | 2
Position Clock
For the best reception, please place clock on a wall that faces
Ft. Collins, Colorado. The antenna is best positioned for signal
reception when there is only one wall or window between the
clock and outside.
Choose a location 6 feet or more from electronics such as
cordless phones, wireless gaming systems, televisions,
microwaves, routers, baby monitors, etc., which can prevent
signal reception.
Large office buildings, schools, or hospitals may not receive
the WWVB time signal in every room.
Buildings with a metal roof may interfere with reception.
Note: We recommend that you change the battery every 24
months to maintain accuracy. Remove the battery when the clock
will not be in use for an extended period.
Manual Set Time
On rare occasions, the clock may
not be able to utilize the radio
controlled function because of the
strength of the signal or the
geographic location. In this case,
the clock can be set manually and
used as a regular quartz wall clock.
Note: Allow up to five nights for the clock to receive the WWVB
signal before manually setting the time.
Set the clock manually:
1. Hold the SET button for 3+ seconds to activate the manual
mode. There are two ways to move the minute hand forward.
Hold the SET button down to move the minute hand
forward consistently.
Alternatively, press the SET button rapidly (more than once
per second) to move the minute hand forward step by step
(in minute increments).
Use these features to move the minute hand forward until
the correct time is set. The clock will automatically leave
manual mode after the SET button is not pressed for 6+
seconds.

Model: WT-3102S www.lacrossetechnology.com/support Page | 3
Troubleshooting
The wonderful advantage of owning a radio-controlled clock is that
it is virtually trouble free. If the clock receives a clear time signal, it
will set itself perfectly. If it does not receive a time signal, consider
the following:
Battery – The clock must have a fresh battery to receive and
process the time signal.
Location – Try a different location, ideally near a window that
faces Colorado.
 Weather – Electrical storms between you and Colorado
during the night will interfere with the WWVB signal.
Hands Spin- When the hands spin about the same time every
day the clock is auto-correcting the time. The hour hand
should not spin more than twice around the clock. Hands may
spin if the battery is under powered or over powered.
Daylight Saving Time:
The National Institute of Standards and Technology and WWVB
encode a special DST “bit” in the WWVB transmission for DST.
Your clock will read this information and automatically advance the
hands one hour in the spring and eleven hours in the fall.
If you live in an area that does not recognize DST, you must slide
the DST switch OFF. To reactivate the DST program simply slide
the switch to the ON position.
Manual WWVB Time Signal Search
For WWVB information: www.nist.gov/pml/div688/grp40/wwvb.cfm
Manual Signal Search:
The WWVB signal is strongest at night.
Hold the WAVE button down for 3+ seconds.
The hands will automatically reset to the 12:00 position, and
the clock will search for the WWVB time signal.
If the clock receives the signal, the clock will set automatically
to the correct time. The signal search takes approximately 3-8
minutes.
Set the clock manually, and the movement's micro-CPU will
control the time keeping function.

Model: WT-3102S www.lacrossetechnology.com/support Page | 4
Frequently Asked Questions
Q. How long will the battery last?
A. A good AA alkaline battery will last over 24 months.
Q: Can I wire a control timing circuit to the La Crosse Technology® atomic
clock?
A: The clock cannot work on a timing circuit. Opening the clock voids the warranty.
Q: Is there a booster antenna to receive the WWVB signal in a difficult location?
A: The clock cannot work with a booster antenna. Opening the clock or movement
voids the warranty.
Q: Can I shut off the WWVB signal?
A: No. If you manually set the time, when the clock receives a WWVB signal, that
signal will override the manual set. The WAVE button will temporarily stop a WWVB
search, but will not permanent stop the clock from receiving a WWVB time signal.
Care and Maintenance
Do not mix old and new batteries
Do not mix Alkaline, Standard, Lithium or Rechargeable Batteries
Always purchase the correct size and grade of battery suitable for intended use.
Replace all batteries of a set at the same time.
Clean the battery contacts and also those of the device prior to battery
installation.
Ensure the batteries are installed with correct polarity (+and -).
Remove batteries from clock which is not to be used for an extended period of
time.
Remove expired batteries promptly.
Warranty and Support Information
La Crosse Technology, Ltd. provides a 1-year limited time warranty (from date of
purchase) on this product relating to manufacturing defects in materials &
workmanship.
Before returning a product, please contact our friendly customer support with
questions or visit our online help:
Phone: [phone]
Online Product Support: www.lacrossetechnology.com/support
Product Registration:
www.lacrossetechnology.com/support/register
View full warranty details online at:
www.lacrossetechnology.com/warranty_info.pdf
Warranty Address:
La Crosse Technology, Ltd
2830 S. 26th St.
La Crosse, WI 54601