Auriol AFT 77 B2 Manual De Instrucciones página 15

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 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 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 temperature
station 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. other electronic devices).
If reception problems persist, you should change the location of the
temperature station (e.g. put it by a window).
AFT 77 B2
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