Operating Instructions

AFT 77 A1
■ 14
│
US - EN
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).
IB_320042_AFT77A1_Funk-Temperaturstation_LB9.indb 14 08.03.19 09:30