CLOCK WINDOW
WWVB RADIO CONTROLLED TIME
The NIST (National Institute of Standards and Technology) radio station (WWVB) is located in
Ft. Collins, Colorado. It transmits an exact time signal continuously throughout the most of the
continental United States at 60 KHz frequency. The main unit can receive this WWVB signal
through the internal antenna from up to 2,000 miles away. Due to the nature of the Earth’s
ionosphere, reception can be limited during the daylight hours. The radio controlled clock will
search for an alternate station that receives the atomic time signal from the NIST Atomic clock
in Boulder, Colorado.
The WWVB tower icon on the unit’s display will flash indicating a radio signal reception from
the WWVB station. If the tower icon is not fully lit, or if the time and date are not set
automatically, please consider the following:
• During nighttime hours, atmospheric disturbances are typically less severe and radio signal
reception may improve. A single daily reception is sufficient enough to keep the clock
accuracy within 1 second.
• Make sure the unit is positioned at 8 feet (2 meters) distance from any interference source
such as a TV, computer monitor, microwave, etc.
• Within concrete wall rooms such as basements or office buildings, the received signal may be
weakened. Always place the main unit near the window for better reception.
Once the atomic time signal is received, the date and time will be set automatically, and the
[ ] icon will appear.
Indicator
displayed
COM
WET
DRY
Temperature
Range
Humidity
Range
Shows current
condition
20°C to 25°C
(68°F to 77°F)
40%RH-
70%RH
Ideal relative humidity
and temperature
-5°C to 50°C
(23°F to122°F)
OVER
70%RH
Contains excess
moisture
5°C to 50°C
(23°F to122°F)
BELOW
40%RH
Contains inadequate
moisture
ICON
Time Signal Reception Strength
Undefined data
(Flashing)
No Reception for the past 24 hours
Weak signal, but can be decoded
Strong signal
COMFORT LEVEL INDICATION
The main unit is capable of detecting and displaying the current indoor comfort levels of
surrounding environment. The comfort level based on the combination of the current indoor
temperature and humidity readings. The following comfort levels may be displayed:
COMFORT
(comfortable);
WET
(wet) and
DRY
(dry)
10
