Honeywell PRC507W, RN507 user manual Atomic Clock, Appendix, Wwvb Radio Controlled Time

Weather Radio these alerts are turned off. To change your alert settings, please see ALERT SELECTION section. For a list of NWS alerts see

APPENDIX 2.

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 Atomic Time Clock in your Weather Station 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 night-time 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 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.

NOTE: At the time of the initial reception allow at least 24 hours for the atomic time receiver to pick up the signal. In some cases, depending on the location, it may take up to 72 hours

If the initial reception was not successful and the time signal has not been received in this first 8 minutes, you may use the MODE button to set the time and date manually. (Refer to the MANUAL SETTINGS section). After the clock is set manually, place the main unit by the window for better reception. The atomic clock receiver is programmed that it will

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continue to search for the atomic time signal daily for every hour between 1:00 am and 4:30 am.

Once the time signal has been successfully received, the time and date will be updated automatically.

To enable or disable the atomic time receiver:

•Press and hold UP - if atomic time reception is activated, a circular tower icon will start flashing next to the clock icon. If reception is disabled, the circular tower icon will disappear.

Icon	Atomic Time Reception Strength
(flashing)	Undefined data
(without circle)	Reception failed for the past 24 hours
(one circle)	Weak signal, but can be decoded
	Strong signal

ATOMIC CLOCK

Immediately after batteries installation, the clock will beep and display all available LCD segments for a moment. Immediately after the atomic time signal receiver will start searching for the atomic time signal. It usually takes between 5-8 minutes.

NOTE: Do not press any buttons on the unit during auto search as it may interrupt product’s operation, and you will need to start the set up procedure again.

If the reception is successful and the atomic time signal is received, the

date and time will be set automatically, and the icon will appear on the display.

NOTE: It is necessary to set your Time Zone, having in mind that the

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