La Crosse Technology WT-2165 Instruction Manual page 6

signal has been received. If the WWVB
time has not been received after 10
minutes of battery installation, you may
manually set the time or wait for the
WWVB reception.
About Radio-Controlled
WWVB:
The NIST (National Institute of Standards
and Technology—Time and Frequency
Division) WWVB radio station is located in
Ft. Collins, Colorado, and transmits the
exact time and date signal continuously
throughout the United States at 60 kHz.
The signal can be received up to 2,000
miles away through the internal antenna in
the alarm clock.
nature of the Earth's Ionosphere, reception
is very limited during daylight hours. The
alarm clock will search for a signal every
night when reception is best. The WWVB
radio station derives its signal from the
NIST Atomic clock in Boulder, Colorado. A
team of atomic physicists is continually
measuring every second, of every day, to an
Time
However, due to the
signal,
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