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INFORMATION ABOUT THE WWVB SIGNAL RECEIVER IN CKA1100
• When the radio is connected to AC power for the first time the receiver turns
‘On’ automatically and tries to receive the WWVB time signal. If the signal is
received successfully the clock display will scroll for a few moments and then
show the correct month, date, day, and time in the Eastern Zone (ZONE 01),
which is the default time zone.
• If the WWVB time signal is not received within 10 minutes the receiver switches
‘Off’ and the display shows 12:10 (AM), Monday 1 01 (January 1
st
). The clock
starts running at this point. At the beginning of each hour the receiver again
turns ‘On’ automatically and tries to receive the WWVB signal for 10 minutes.
This 10 minute ‘On’ and 50 minute ‘Off’ cycle will continue indefinitely until the
WWVB signal is received.
• You can turn the receiver ‘On’ at any time by pressing the “+” and “–” buttons
together. If you do switch it on manually in this manner it will listen for the WWVB
signal for 10 minutes and then shut ‘Off’ again.
• Since the WWVB receiver can generate Radio Frequency Interference (RFI)
that can interfere with normal AM/FM reception we have designed this model so
that the WWVB receiver automatically switches ‘Off’ whenever the AM/FM radio
is turned ‘On’. If you switch the radio ‘On’ before the WWVB signal is received
the clock will not be able to set itself while that radio is ‘On’. After switching the
radio ‘Off’ press the “+” and “–” buttons together to switch the WWVB receiver
‘On’ again.
• The WWVB receiver is automatically programmed to switch ‘On’ every day for
10 minutes at the hours of 1 AM, 2 AM, 3 AM, 4 AM, and 5 AM when the WWVB
signal is strongest. So even after the WWVB signal was received and the clock
has set itself, it will continue to monitor the WWVB signal 5 times each day and
resynchronize itself if necessary to maintain perfect accuracy.
• If you live in a difficult reception area and you do not wish to wait for the clock to
set itself automatically you may set the clock manually by following the instructions
below. However once the WWVB signal is finally received the clock will
synchronize itself automatically with the U.S Atomic Clock. Some people like to
set their clocks 5 or 10 minutes fast to make sure they are always “on time”.
That is not possible with this or any other “atomic clock”. Once the WWVB
signal is received the clock will ignore your setting and readjust itself to the
correct time automatically.
CKA1100_drafts052102.p65 21/5/2002, 15:199