Auriol AFT 77 A1 User Manual page 14

The WWVB signal
WWVB is a National Institute of Standards and
Technology (NIST) time signal radio station near
Fort Collins, Colorado . The 70 kW ERP signal
transmitted from WWVB is a continuous 60 kHz
carrier wave, the frequency of which is derived
from a set of atomic clocks located at the trans-
mitter site, yielding a frequency uncertainty of
less than 1 part in one trillion .
Under ideal conditions, the temperature station
can receive the signal up to a distance of ap-
proximately 2000 miles from the transmitter .
Reception of the WWVB signal normally takes
between 3 and 5 minutes . If reception of the
WWVB signal fails, the temperature station will
stop trying to establish reception after approxi-
mately 7 minutes .
Reception can be considerably restricted by
obstacles (e .g . concrete walls) or interference
sources (e .g . other electronic devices) .
If reception problems persist, you should
change the location of the temperature station
(e .g . put it by a window) .
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