La Crosse Technology T83721 Dimensions

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T83721 FAQS
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CONTENTS
T83721 FAQS............................................................................................................................ 1
Projection Alarm Factory Restart ........................................................................................... 2
Outdoor Temperature Sensor ................................................................................................. 2
Compatible Outdoor Sensors ................................................................................................. 2
Quick Connect........................................................................................................................ 2
Batteries ................................................................................................................................... 3
Power Requirements.............................................................................................................. 3
Dashes show for Outdoor Temperature.................................................................................. 3
Inaccurate Outdoor Temperature Reading ............................................................................. 3
Intermittent Outdoor Temperature .......................................................................................... 3
Outdoor Temperature is stuck or HH.H, LL.L.......................................................................... 4
Outdoor sensor drains batteries quickly.................................................................................. 4
Outdoor sensor fell. The sensor no longer works.................................................................... 4
Mounting/Positioning Outdoor sensor..................................................................................... 4
Position Projection Alarm........................................................................................................ 5
Distance/Resistance/Interference........................................................................................... 5
Projection Alarm ...................................................................................................................... 6
How tall are the time numbers?.............................................................................................. 6
Power Requirements.............................................................................................................. 6
12-Hour or 24-Hour time format.............................................................................................. 6
Fahrenheit/Celsius.................................................................................................................. 6
Dashes, HH.H, LL.L or stuck Indoor Temperature.................................................................. 6
Inaccurate Indoor Temperature Reading................................................................................ 6
Time is off by hours................................................................................................................ 6
Supported Time Zones........................................................................................................... 7
Manually Set Time/Date: Program Menu............................................................................... 7
Set Time Alarm....................................................................................................................... 7
Activate/Deactivate time alarm ............................................................................................... 8
Snooze Alarm......................................................................................................................... 8
USB Charge Port.................................................................................................................... 8
Clock resets when using USB charge port.............................................................................. 8
Projection not working............................................................................................................ 8

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Projection Adjustments........................................................................................................... 8
Daylight Saving Time.............................................................................................................. 9
No WWVB Tower Icon............................................................................................................ 9
Moon Phase........................................................................................................................... 9
Projection alarm is dim........................................................................................................... 9
Projection alarm has distorted or frozen display ....................................................................10
Projection alarm is blank: No letters, numbers or dashed lines..............................................10
Projection alarm drains batteries quickly................................................................................10
Projection alarm has missing segments.................................................................................10
Projection Alarm Factory Restart
Explanation: The factory restart returns the projection alarm and outdoor sensor to an “out-of-the-box”
state and often resolves an issue.
Factory Restart:
1. Remove all power (batteries and AC) from outdoor sensor and projection alarm.
2. Press one of the buttons on the projection alarm at least 20 times to clear all memory.
3. Verify that the projection alarm is blank before proceeding (some lines are painted on the screen and
will show with batteries out).
4. Leave unpowered for 15 minutes (very important).
5. Insert the AC cord into the wall outlet then into the projection alarm.
6. Insert fresh batteries into the outdoor sensor.
7. Press the TX button on the outdoor sensor to transmit RF signal.
8. Keep the outdoor sensor 5-10 feet from the projection alarm.
9. When RF connection is established, the temperature will appear on the station. Allow the outdoor
sensor and projection alarm to sit together for 15 minutes to establish a strong connection.
10. Do not press buttons for 15 minutes.
For optimum 433MHz transmission, place the outdoor sensor no more than 200 feet (60 meters, open
air) from the projection alarm.
See the section on mounting and distance/resistance/interference for details on mounting the outdoor
sensor.
Outdoor Temperature Sensor
Compatible Outdoor Sensors
The TX141-B outdoor sensor comes packaged with this projection alarm.
The TX141-B and TX141-A (433MHz) outdoor sensors are compatible with this projection alarm.
Quick Connect
Explanation: The quick connect is used for a projection alarm and outdoor sensor that have been
working but lost connection due to interference or low batteries. This is not a thorough factory reset.
1. Bring the outdoor sensor and projection alarm together inside and place the units 5-10 feet apart
with nothing between them.
2. Hold the +/TEMP button on the projection alarm. The outdoor temperature area will flash.
3. Remove battery cover from the outdoor sensor and press and release the TX button to send the
signal.
4. Wait for 2 minutes for the outdoor temperature to appear on the projection alarm.
Factory Restart: If the above procedure does not work, please try the factory reset.

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Batteries
Explanation: Many problems are resolved with fresh batteries of the appropriate voltage. Many items
sent in under warranty work when tested with fresh batteries. Batteries manufactured this year will have
an expiration date 10 years (or more) in the future. Battery technology has improved and batteries will
maintain voltage longer in storage. However, the environment the batteries reside in for the 10 years can
deplete the power.
Use Alkaline or Lithium batteries in the outdoor sensors.
A minimum voltage of 1.48V for each battery is necessary for proper performance.
Use batteries dated at least six years in advance of the current year. Batteries dated earlier than six
years from now may still work, but may be unstable in performance.
Good name brand batteries make less noise, which reduces the chance of RF (radio frequency)
interference from the battery compartment.
Power Requirements
2-AA batteries power the outdoor sensor.
We recommend Alkaline batteries for the outdoor sensor.
You may choose to use Lithium batteries for temperatures below -20°F/-28.8°C.
Dashes show for Outdoor Temperature
Explanation: Dashes mean the connection is lost between the projection alarm and the outdoor sensor.
Batteries often resolve the connection.
Distance/Resistance can cause loss of connection between the outdoor sensor and the projection
alarm.
Turn the projection alarm 90 degrees towards the outdoor sensor to provide better reception. This
allows more antenna surface to face the outdoor sensor signal.
Try the quick connect or factory restart.
Inaccurate Outdoor Temperature Reading
Explanation: High outdoor temperature readings are generally a location issue. Low outdoor temperature
readings are power related or a sensors going bad.
The outdoor sensor reads the environment where it is mounted. When mounted inside the home, it
will read inside temperature.
When the outdoor sensor reads high during the day, but not at night, it is a positioning problem.
Look for heat sources such as sunlight, door or window frames or reflected heat.
Side-by-side test: Bring the outdoor sensor in the house and place it next to the projection alarm for 2
hours.
Compare indoor and outdoor temperature. The temperatures should be within 4 degrees to be within
tolerance.
If the outdoor sensor reads correctly when next to the projection alarm, try a different location outside.
Intermittent Outdoor Temperature
Explanation: Intermittent problems are the hardest to resolve. RF (radio frequency) communication may
come and go occasionally. This can be normal in some environments (e.g. moister climates). If outdoor
sensor signal is lost, please wait 2-4 hours for the signal to reconnect on its own.
Move the outdoor sensor to a closer location.
Distance/Resistance can cause loss of outdoor sensor signal.
Check Batteries.

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Freezer test: Confirm the projection alarm is reading the correct outdoor sensor. Place the outdoor
sensor in the freezer for an hour and watch the temperature drop on the projection alarm.
Indoor distance test: Please complete the Restart with outdoor sensor and projection alarm 5-10 feet
apart and inside to establish a strong connection.
After 15 minutes, if there is a reading in the outdoor temperature area, move the outdoor sensor to
another room with one wall between the outdoor sensor and the projection alarm.
Observe to see if the temperature remains on consistently for 1 hour.
If the temperature remains on while in the house, then it is likely a distance/resistance issue.
Move the outdoor sensor to different locations outside to find a location where the temperature
reading will hold.
Outdoor Temperature is stuck or HH.H, LL.L
Explanation: These symbols are error messages indication the outdoor sensor is outside of its readable
range.
Check Batteries. Overpowered or underpowered batteries can cause this reading.
Replace outdoor sensor.
Note: The last outdoor reading may remain (not change) for several hours when connection is lost. The
outdoor temperature reading will flash when the connection is first lost or intermittent.
Outdoor sensor drains batteries quickly
Test a new set of alkaline batteries. Write down the date of installation and the voltage of the
batteries.
When the batteries fail, please note the date and voltage again.
Check the distance and resistance between the outdoor sensor and projection alarm. Outdoor
sensors at the end of the range may work while batteries are fresh but not after they drain a bit.
Check for leaking batteries, which may damage the outdoor sensor.
Battery life is over 24 months when using reputable battery brands for both Alkaline and Lithium
batteries.
Outdoor sensor fell. The sensor no longer works
Explanation: If there is no physical damage to the outdoor sensor, the fall may not have caused internal
damage. A fall can shock the outdoor sensor or the batteries in the outdoor sensor. Batteries that have
fallen on a hard surface may be damaged and unable to function properly.
Complete a Restart with fresh batteries.
Use Batteries dated at least six years in advance of the current year. Batteries dated earlier than six
years from now may still work, but may be unstable in performance.
Note: An outdoor sensor that has fallen into puddle, snow, or other standing water, will likely have water
damage and needs to be replaced. Outdoor sensors are water resistant, not waterproof.
Replacement Outdoor Sensors
Visit your local Retailer or La Crosse Technology® Store http://store.lacrossetechnology.com/
Note: Be sure to order the correct model and frequency to avoid receiving the incorrect item.
Call La Crosse Technology® Store at 608-785-7939 or e-mail from our website if you are unsure
about the correct item to order. Each item carries the original new product warranty and includes
access to La Crosse Technology technical support.
Mounting/Positioning Outdoor sensor
First: Place the outdoor sensor in the desired shaded location and the projection alarm in the home. Wait
approximately 1 hour before permanently mounting the outdoor sensor to ensure that there is proper
reception.

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POSITION
Mount outdoor temperature outdoor sensors vertically.
Protect the outdoor sensor from standing rain or snow and from the overhead sun, which can cause it
to read incorrectly.
Mounting under an eave or deck rail works well.
If you choose, you can construct a small roof or box for the outdoor sensor. Be sure a box has vents.
Mount the outdoor sensor on the North side where to prevent sun from causing incorrect readings.
Mount at least 6 feet in the air for a strong RF (radio frequency) signal.
Outdoor sensors are water resistant, not waterproof.
Avoid more than one wall between the outdoor sensor and the projection alarm.
The maximum transmitting range in open air is over 200 feet (60 meters).
Obstacles such as walls, windows, stucco, concrete and large metal objects can reduce the range.
Do not mount near electrical wires, transmitting antennas or other items that will interfere with the
signal.
RF (radio frequency) signals do not travel well through moisture or dirt.
Do not mount the outdoor sensor on a metal fence. This significantly reduces the effective range.
MOUNT
Option 1:
Install one mounting screw (not included) into a wall.
Place the outdoor sensor onto the screw (hanging hole on the backside).
Gently pull down to lock the screw in place.
Option 2:
Insert the mounting screw through the front of the outdoor sensor and into the wall.
Tighten the screw to snug (do not over tighten).
Position Projection Alarm
The projection alarm has a wide base to sit on a desk or table.
Place within range of the outdoor sensor.
The maximum transmitting range in open air is 200 feet (60 meters).
Obstacles such as walls, windows, stucco, concrete and large metal objects can reduce the range.
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.
Be aware of electrical wires and plumbing within a wall. This will interfere with RF (radio frequency)
signal reception.
Distance/Resistance/Interference
Distance:
The maximum transmitting range in open air is over 200 feet (60 meters) between the outdoor sensor
and the projection alarm. This range is in open air with ideal conditions.
Consider what is in the signal path between the projection alarm and the outdoor sensor.
Avoid placing electronic in the signal path between the projection alarm and the outdoor sensor.
Resistance:
Obstacles such as walls, windows, stucco, concrete and large metal objects can reduce the range.
When considering the distance between the outdoor sensor and the projection alarm (200 feet open
air), cut that distance in half for each wall, window, tree, bush or other obstruction in the signal path.
Closer is better.
Windows reflect the RF (radio frequency) signal.
Metal absorbs the signal and reduces the range.
Stucco has a metal mesh that absorbs the signal.
Do not mount the outdoor sensor on a metal fence. This significantly reduces the effective range.
Interference:
Consider items in the signal path between the outdoor sensor and the projection alarm.

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Sometimes a simple relocation of the outdoor sensor or the projection alarm will correct the
interference.
Windows can reflect the radio signal.
Metal will absorb the RF (radio frequency) signal.
Stucco has a metal mesh that absorbs signal.
Avoid transmitting antennas: (ham radios, emergency dispatch centers, airports, military bases, etc.)
Electrical wires (utilities, cable, etc.)
Vegetation is full of moisture and reduces signal.
It is difficult for RF (radio frequency) signal to travel through a hill.
Projection Alarm
How tall are the time numbers?
The time numbers are 0.75 inches tall.
Power Requirements
This projection alarm is powered by a 5 volt AC power adapter
Alternatively, optional 3-AAA alkaline batteries may be used.
12-Hour or 24-Hour time format
Time can display in 12-hour (am, pm) or 24-hour format.
Default is 12-hour time.
Use the Program Menu to switch time formats.
Fahrenheit/Celsius
Press and release the SET/°F/°C button to select temperature readings in Fahrenheit or Celsius.
Dashes, HH.H, LL.L or stuck Indoor Temperature
Explanation: These symbols are error messages indication the indoor sensor is outside of its readable
range. For indoor readings, this is generally a power related issue.
Batteries may be overpowered or underpowered. Remove batteries from the projection alarm.
Press any button 20 times. Leave the projection alarm unpowered for 1-2 hours.
Install fresh Alkaline batteries with correct polarity.
If the indoor temperature is still shows dashes, HH.H or LL.L, the projection alarm may need
replacement.
Inaccurate Indoor Temperature Reading
Explanation: When the indoor temperature is inaccurate, it is often due to the location of the display or
overpowered/under powered batteries. You can test the accuracy at you home.
Side-by-side test: Bring the outdoor sensor in the house and place it next to the projection alarm for 2
hours.
Compare indoor and outdoor temperature. The temperature should be within 4 degrees to be within
tolerance.
Look for heat sources such as sunlight, door or window frames or reflected heat or cold near the
projection alarm.
Check batteries.
Time is off by hours
Check to see if the WWVB Tower icon appears on the Atomic Projection Alarm. If not, the Atomic
Projection Alarm has not received a WWVB time signal in the past 24-hours.

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Reposition the Atomic Projection Alarm with the front or back facing Colorado.
Check that the Time Zone selected correctly reflects your location. Adjust the time zone in the
Program Menu.
Check that the DST indicator is correct for your location (most areas observe DST so this should be
ON). Adjust the DST indicator in the Program Menu.
Large buildings, metal roofed buildings and buildings or rooms full of electrical and/or radio equipment
make it difficult to receive the WWVB time signal.
Supported Time Zones
Explanation: This atomic projection alarm offers a choice of seven time zones:
AST=Atlantic
EST= Eastern
CST= Central
MST= Mountain
PST= Pacific
AKT= Alaska
HAT=Hawaiian
The atomic projection alarm works in North America. Outside of North America, the projection alarm will
not receive a WWVB signal, but will keep time like a quartz clock.
Manually Set Time/Date: Program Menu
The SET/°F/°C button will move through the program menu. The +/TEMP or -/TIME buttons will change a
value.
1. WWVB ON/OFF: Hold the SET/°F/°C button 5 seconds and WWVB and the word ON will flash. Press
and release the +/TEMP or -/TIME button to turn this to OFF if you do not wish WWVB reception.
Confirm with the SET/°F/°C button and move to the next item.
2. TIME ZONE: EST will flash. Press and release the +/TEMP or -/TIME button to select a different
Time Zone: AST=Atlantic, EST= Eastern, CST= Central, MST= Mountain, PST= Pacific, AKT= Alaska,
HAT=Hawaiian time zone. Confirm with the SET/°F/°C button and move to the next item.
3. DAYLIGHT SAVING TIME: DST will flash and the word ON. Press and release the +/TEMP or -/TIME
button to turn this to OFF if you do not observe DST. Confirm with the SET/°F/°C button and move to
the next item.
4. 12/24 HOUR TIME: 12H will flash. Press and release the +/TEMP or -/TIME button to select 24H.
Confirm with the SET/°F/°C button and move to the next item.
5. HOUR: The hour will flash. Press and release the +/TEMP or -/TIME button to select the correct hour.
Confirm with the SET/°F/°C button and move to the next item.
6. MINUTES: The minutes will flash. Press and release the +/TEMP or -/TIME button to select the
correct minutes. Confirm with the SET/°F/°C button and move to the next item.
7. YEAR: The year will flash. Press and release the +/TEMP or -/TIME button to select the correct year.
Confirm with the SET/°F/°C button and move to the next item.
8. MONTH: The month will flash. Press and release the +/TEMP or -/TIME button to select the correct
month. Confirm with the SET/°F/°C button and move to the next item.
9. DATE: The date will flash. Press and release the +/TEMP or -/TIME button to select the correct date.
Confirm with the SET/°F/°C button and exit the program menu.
10. Note: The Day of the Week will SET automatically after the year, month and date are set.
11. Note: If no buttons are pressed in a 20-second period the projection alarm will return to a live display
reflecting whatever adjustments were made before it timed out.
Set Time Alarm
In normal mode, hold the TIME ALARM button for three seconds to enter alarm set mode.
1. HOUR: The Hour will flash, use the ARROW buttons to set the hour, and press TIME ALARM button
to confirm and switch to minutes.
2. MINUTES: The Minutes will flash, use the ARROW buttons to set the minutes, and press TIME
ALARM button to confirm.
3. Press the SETTINGS button to return to normal mode.

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Note: When no buttons are pressed for ten seconds, the projection alarm will save the last change and
default back to normal mode
Activate/Deactivate time alarm
In normal mode, press and release the TIME ALARM button once to show alarm time.
Press and release the TIME ALARM button repeatedly to turn ON/OFF alarm.
The alarm icon appears when alarm is active.
Note: The alarm will ring for 2 minutes then turn off if no buttons are pressed.
Snooze Alarm
When the alarm sounds, press the HI/LOW/OFF button to snooze the alarm for 10 minutes.
The snooze option can repeat three times.
The alarm icon will flash while the snooze feature is active.
Note: while the alarm sounds press any button except the TIME ALARM button to turn the alarm off.
USB Charge Port
Explanation: The projection alarm has an integrated USB charging port (on back) that will charge a
device when the projection alarm is plugged into a power outlet.
Note: This is a power-output charging port. It does not supply power to the projection alarm.
Connect your external device’s USB charging cable (not included) to the USB charging port.
Charging times will vary.
USB Power Output: 0.5A maximum current. Charge 0.5A devices or devices that are self-regulating.
Note: Some USB cables are for data transfer only and cannot be used for charging. Make sure that the
USB cable you use will charge your device. Most USB cables included with mobile devices will work for
charging.
Note: Many devices may require more power to charge than provided by this projection alarm.
Clock resets when using USB charge port
Power output of this USB port is 0.5A.
The device you are trying to charge requires more than 0.5A to charge.
Projection not working
Projection only shows when SNOOZE/LIGHT button is pressed:
Check the Projection ON/OFF switch, to be sure it is in the ON position.
Check that the a/c cord is properly plugged in. Line it up and push it in. Once you are sure it is in
correctly, remove the batteries. If the display goes blank, the a/c cord needs adjustment.
Projection Adjustments
When operating on A/C power the projection will display constantly unless projection is turned off or when
the clock is searching for WWVB signal.
Operating on a/c power:
Projection ON/OFF: Use the PROJECTION ON/OFF slide switch on the back of the clock to turn
the projection off when operating on a/c power.
Rotate Projection: Press and release the PROJECTION/DIRECTION button to rotate projection
image 180 degrees as viewed on the wall or ceiling.
Focus Projection: Use the focus wheel on the projection arm to adjust the clarity of the
projection on the wall or ceiling.
Time/Outdoor Temperature Projection: The projection will alternate between time and
outdoor temperature every 5 seconds. This projection cannot change to just time or just
temperature. The projection will always alternate.

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Operating on battery power only:
Press and release the SNOOZE/LIGHT button on top of the Atomic Projection Alarm to show the
projection for 5 seconds.
Note: Projection will not display constantly when operating on battery power.
Daylight Saving Time
Dependent on your location, position of the clock in your home, and atmospheric interference, it may
take up to 5 nights for the change from Daylight Savings Time to Standard Time and vice-versa to
occur.
Check for a WWVB Tower Icon showing on your Clock. The tower icon indicates you have received
the WWVB signal from Ft Collins CO in the past 24-hours.
Check that the clock is in the correct Time Zone.
Check whether the DST indicator is ON or OFF. If the indicator is OFF the clock will not change.
Check for fresh batteries. Without proper batteries, the antenna will have a harder time picking up
the signal.
Position the Atomic Projection Alarm in a window (with the front or back) facing Ft. Collins, Colorado
and leave for up to five nights. If you do not have a window facing this direction, locate the Clock near
an outside wall and point the unit in this general direction.
No WWVB Tower Icon
The Atomic Projection Alarm has not received a WWVB time signal in the past 24-hours.
Position the Atomic Projection Alarm for better reception.
Hold the -/TIME button to send the Atomic Projection Alarm on a signal search at night.
Allow up to 5 nights to receive the time signal.
Moon Phase
The eight phases of the moon shown below are determined by the year, month, and date set on the
Atomic Projection Alarm.
Note: With the moon shown against a light colored background, the phases will show opposite to a paper
calendar. The segments that are highlighted portray the part of the moon that is lit. For instance, the
moon will be blank during a new moon and dark during a full moon.
New Moon occurs when the moon is between the earth and sun so the illuminated portion of the
moon is on the backside facing the sun and we cannot see it. After a new moon, the illuminated
portion will increase or wax until the full moon occurs.
Full Moon occurs when the earth, moon, and sun are in approximate alignment, with the moon and
the sun on opposite sides of the earth. The illuminated portion of the moon faces the earth, giving us
complete visibility of one side of the entire moon. After a full moon, the illuminated portion will
decrease or wane until the new moon occurs.
First Quarter and Last Quarter moons occur when the moon is at a 90-degree angle to the earth
and sun. Therefore, we see half of the moon illuminated and half is in shadow.
Waxing means growing or expanding illumination and happens after a new moon.
Waning means decreasing illumination and occurs after a full moon.
Crescent refers to the moon being less than half-illuminated. Crescents can be waning or waxing.
Gibbous describes a moon phase when more than half is illuminated. Gibbous can be waxing or
waning.
Projection alarm is dim
Explanation: Most projection alarms have a gray background. Place the projection alarm at eye level, to
determine if it is dim. Projection alarms that sit in the sunlight can develop a cloudy film over time.
This is generally a power related issue.
Batteries may be overpowered or underpowered. Remove batteries from projection alarm.
Press any button 20 times. Leave the projection alarm unpowered for 1-2 hours.
Install fresh alkaline batteries with correct polarity.

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Projection alarm has distorted or frozen display
Explanation: On a brand new projection alarm, check for thin plastic film of printed scratch guard that
may be on the screen of the projection alarm. This thin piece of plastic has printed numbers for store
displays. When the batteries are installed, the “real” numbers show behind the printed scratch guard and
create distortion.
With all power removed, the projection alarm should be blank.
If numbers still appear, please check for scratch guard.
Power:
Check that the batteries are installed correctly.
This is generally a power related issue.
Batteries may be overpowered or underpowered.
Remove batteries from projection alarm.
Press any button 20 times. Leave the batteries out of the display for 2 hours.
Insert batteries into the projection alarm.
Projection alarm is blank: No letters, numbers or dashed lines
Check that the batteries are installed correctly.
Batteries may be overpowered or underpowered.
Remove batteries from projection alarm.
Press any button 20 times. Leave the batteries out of the display for 2 hours.
Insert batteries into the projection alarm.
Projection alarm drains batteries quickly
Test a new set of alkaline batteries. Write down the date of installation and the voltage of the
batteries.
When the batteries fail, please note the date and voltage again. This is helpful in determining the
problem.
Check for leaking batteries, which may damage the projection alarm.
Battery life is over 12 months when using reputable battery brands.
Projection alarm has missing segments
Explanation: When parts of numbers, letters, or pictures are missing on the display, it is often power
related.
Batteries may be overpowered or underpowered. Remove batteries from projection alarm.
Press any button 20 times. Leave the projection alarm unpowered for 1-2 hours.
Install fresh alkaline batteries with correct polarity.