Silvercrest SFPW 360 B1 User Manual page 12

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 transmitter site, yielding a fre-
quency uncertainty of less than 1 part in one trillion .
Under ideal conditions, the device can receive the
signal up to a distance of approximately 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 device will stop trying
to establish reception after approximately 7 minutes .
Reception can be considerably restricted by obstacles
(e .g . concrete walls) or interference sources (e .g . oth-
er electronic devices) . If reception problems persist,
you should change the location of the device (e .g . put
it by a window) .
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