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Setup Instructions Step-By-Step
Step 1:
• Slide the battery cover down and lift off the back of the transmitter.
• Insert 2 NEW AAA batteries (not included) into the TX40U-IT transmitter. Observe the correct polarity.
Step 2:
• Remove battery cover from atomic wall clock: insert a solid object in the space provided at the lower-central position of
the battery cover, then push up and pull out on the battery cover.
• Insert 2 NEW AA batteries (not included) into the back of the atomic wall clock. Observe the correct polarity (see
marking inside the battery compartment). The atomic wall clock will display time and indoor temperature.
• Within 3 minutes the outdoor temperature should be displayed.
• Keep the atomic wall clock and transmitter within 10 feet of each other during setup (15 minutes).
• Do Not Mix Old and New Batteries
• Do Not Mix Alkaline, Standard, Lithium or Rechargeable Batteries
915MHz Reception for Outdoor Transmitter
The atomic wall clock will receive the temperature data within 4 seconds. If the temperature data is not being received 2
minutes after set up (or the display shows “- - -”), then please check the following points:
1. The distance of the atomic wall clock or outdoor temperature transmitter should be at least 6 feet (2 meters) away
from any interfering sources such as computer monitors or TV sets.
2. Avoid placing the receiver onto or in the immediate proximity of metal window frames.
3. Using other electrical products such as headphones or speakers operating on the same signal frequency (915MHz)
may prevent correct signal transmission and reception.
4. Neighbors using electrical devices operating on the 915MHz signal frequency can also cause interference.
Note: When the 915 MHz signal is received correctly, do not re-open the battery cover of either the outdoor temperature
transmitter or atomic wall clock, as the batteries may spring free from the contacts and force a false reset. Should this
happen accidentally then reset all units (see SETUP above) otherwise transmission problems may occur.
The maximum transmission range is 220 feet (60 meters) from the outdoor temperature transmitter to the atomic wall
clock (in open space). However, this depends on the surrounding environment and interference levels. If no reception is
possible despite the observation of these factors, all system units have to be reset (see SETUP).
WWVB Radio-controlled Time Signal
The NIST radio station, WWVB, is located in Ft. Collins, Colorado and transmits the exact time signal continuously
throughout the United States at 60 kHz. The signal can be received up to 2,000 miles away through the internal
antenna in the atomic wall clock. However, due to the nature of the Earth’s Ionosphere, reception is very limited
during daylight hours. The atomic wall clock will search for a signal every night when reception is best.
Once the outdoor temperature is displayed on the atomic wall clock, the WWVB tower icon in the atomic wall clock will
flash the top of the LCD. This indicates that the atomic wall clock has detected a radio signal and is trying to receive it.
When the time code is received, the WWVB tower becomes permanently lit and the time will be displayed.
If the tower icon flashes, but does not set the time or the WWVB tower does not appear at all, then please take note of the
following:
• Recommended distance to any interfering sources like computer monitors or TV sets is a minimum of 6 feet (2 meters).
• Within ferro-concrete rooms (basements, superstructures), the received signal is naturally weakened. In extreme cases,
please place the unit close to a window and/or point its front or back towards the Fort Collins, Colorado..
• During nighttime, the atmospheric disturbances are usually less severe and reception is possible in most cases. A single
daily reception is adequate to keep the accuracy deviation below 1 second.
Note: In case the atomic wall clock is not able to detect the WWVB-signal (disturbances, transmitting distance, etc.), the
time can be manually set (please see Program Menu).
Function Buttons
The atomic wall clock has four easy to use buttons:
SET + ALM SNZ