La Crosse Technology WT-5120 Instruction Manual page 8

then be displayed on the clock. If this does not happen after 2 minutes, the
batteries will need to be removed from both units and reset from step 1.
4. When the transmitter is set up, there is a testing period. Then DCF-77 time code
reception is automatically started just after the clock is activated. This takes
typically between 3-5 minutes in good conditions. This time period is an excellent
opportunity to locate the transmitter in suitable location outdoors. In order to
ensure sufficient 868 MHz transmission however, the distance between the
Projection clock and the transmitter should not be more than 100 meters (see
notes on "Positioning" and "868 MHz Reception").
5. If after 10 minutes the DCF time has not been received, use the MODE/ MIN key
to manually enter a time (and date) initially. The clock will automatically attempt to
receive the DCF time each day at 2:00 am. When this is successful, the received
time will override the manually set time.
Note:
Should the total time of inserting the batteries into the transmitter take longer than 1-1/2
minutes from the time of inserting the batteries into the projection clock then
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