La Crosse Technology EH-21G User Manual

Analog Watch Instruction Manual

Welcome to the world of radio-controlled timekeeping
technology. We hope you will enjoy the convenience of
never having to set your watch again and the confidence of
knowing exactly what time it is. Your new radio-controlled
watch is a special edition produced by La Crosse
Technology specifically for E. Howard. It will provide you
with years of trouble free, easy operation and the most
accurate time in the world.

1. Description of WWVB

The most accurate clock in the United States is the
atomic cesium clock located at:
U.S. Department of Commerce
National Institute of Standards and Technology

(NIST)
Boulder, Colorado
Your atomic watch receives time signals on long wave
radio (60 kHz) from the NIST operated WWVB time
signal transmitter located in Fort Collins, CO and
coupled with the atomic cesium clock in Boulder. Until
recently, the transmitter was used predominantly by
telephone companies, radio and television stations,
navigations of planes and ships and for scientific
purposes in laboratories. Now this precise signal can
be received by the atomic watch technology.

Your atomic watch receives the WWVB time signal via
its built-in antenna system. The proper function of the
receiver contained in this product has been tested as a
prototype with regard to its sensitivity and range of
reception in different places throughout the United
States.

Any claim for warranty – express or implied – due to the
watch’s failure to properly receive the radio signal due
to interference, whatever may be the source of this
interference, are hereby expressly excluded in all
respects. For more information about the WWVB­Radio signal please visit the NIST website at:

www.boulder.nist.gov

For actual signal coverage in North America please
visit:

www.boulder.nist.gov/timefreq/stations/wwvbcoverage.
htm.

.

The atomic watch’s internal computer processes the
received time signals and automatically synchronizes
the hands, date and the change over between daylight
saving time and standard time as well as the leap year
accordingly. The signal reception and synchronization
occur automatically every night and manually upon
demand.

Even outside of the reception range your atomic watch
will continue to keep excellent time. The highly
accurate 32 kHz quartz movement will ensure precise
time keeping.

2. Functional Description
T1 Button (mode):

The T1 button has two functions:

1. Switches the digital display between date (for

example 12.19) and seconds (for example 32).

2. Receives the WWVB time signal and synchronizes

the time automatically if you press it for longer
than 3 seconds.

T2 button (adjust):

Depending on the mode the T2 button either:

1. Indication of adjusted time zone (T2 < 3 sec).

2. Advances the time zone in 1-hour increments

when setting the time zones.

3. Advances the hands when manually synchronizing

the watch.

3. Synchronizing the Time (signal reception)

The signal reception and synchronization occurs
automatically every night. At any desired time you can
perform a “manual” reception by pressing the T1 button
for at least 3 seconds. The hands will set to the 12
o’clock position (if the hands set to a time other than
exactly 12 o’clock they must be repositioned. See
under 5. Replacing the battery) during reception and
will reset themselves thereafter. Note that your atomic
watch will not receive the WWVB time signal if set to a
time zone other than Pacific, Mountain, Central or
Eastern standard time.

4. Setting the Time Zone

The time preset by the factory might not be the correct
time for the time zone you are in. To set the correct
time zone please follow the instructions listed below:

1. Press the T2 button. The digital display will

change from displaying the date (for example,

12.19) to displaying the current hour (for example
P02 PM). The letter P, M, C or E in front of the
digitally displayed hour stands for Pacific,
Mountain, Central or Eastern standard time zone
respectively. If no letter is displayed in front of the
hour a different time zone has been selected.

2. Press (either short for incremental advance or long
for rapid advance) the T2 button to set the desired
hour for your time zone. Please take note of the
AM/PM symbols in the digital display.
The proper date will be calculated by the internal
microprocessor and at the end of the adjustment
the display returns to the default mode showing
the date.

5. Replacing the Battery

A low battery is signaled by a blinking “LO” in the digital
display.
The battery should be replaced by trained personnel to
avoid damage and to maintain the water resistance
according to factory specifications.

After battery replacement the hands of your atomic
watch must be repositioned to 12 o’clock. The hands
can be advanced either incrementally by repeatedly
pressing the T2 button or rapidly by holding the T2
button. Pressing the T2 button briefly advances the
minutes, holding the button down lets the minute hand
move continuously until the T2 button is released. (The
minute is also shown in the LCD helping you to set the
correct time.) Your watch now uses its integrated
quartz movement. Please note in this mode your watch
cannot display the date. The time you have set is
retained until your watch is able to receive the signal
from the WWVB transmitter again. The date will then
also be set and displayed in the LCD again.

After your atomic watch automatically receives the
WWVB signal the watch will be set to Pacific standard
time. You must then either press the T1 button to
confirm the time or set the desired time zone as
described in 4. Setting the Time Zone.

6. Technical Data

Reception Frequency 60 kHz
Quartz Time Base 32 kHz
Battery Type CR 1620
Operating range voltage 2.4V to 3.4V
Battery Life approx. 2 years
Operating Temperature 32 ºF to 122 ºF
(0 ºC to 50 ºC)

7. Water Resistance

• The “water-resistant” state only applies in new

condition.

• External influences may affect water resistance.

• Please have your watch checked regularly.

* no designation

8. Trouble Shooting

Symptom Problem Solution

The battery

1) The letters
“LO” blink in the
digital display.

2) Your watch
does not
automatically
change between
daylight saving
time and
standard time.

3) The hands do
not move and the
digital display is
blank.

4) The watch
hands do not
advance exactly
to 12 o’clock
during manual
time signal
reception.

*Free field position means a place free of radio
disturbances such as electrical appliances, metal
structures and particular climactic conditions.

The battery is
running low.

The watch has
not received
the WWVB time
signal.

You may be out
of reception
range.

You may be in
or near a
disturbance
field such as a
metal structure,
appliances or
particularly
climactic
conditions.

The battery
may be empty.

The watch
hands are not
properly
positioned.

must be
replaced as
soon as
possible (see 5.
Replacing the
Battery.)

Depress the T1
button and
place your
watch in a *free
field position
for at least 10
minutes,
preferably at
night when
reception is
best.

Press the T1
button for at
least 3 seconds
after re­entering the
reception
range.

Depress the T1
button and
place your
watch in a *free
field position
for at least 10
minutes,
preferably at
night when
reception is
best.

The battery
must be
replaced (see 5.
Replacing the
battery).

Press T1 and
T2 together for
more than 3
seconds then
reposition the
hands as
described
under 5.
Replacing the
battery.