La Crosse Technology WS1506 Instruction Manual page 49

If (1) the outdoor data are not being received within 30 seconds after setting up; (2)
the outdoor display always show "- - -" on the outdoor display; or (3) the reception
icon of thermo-hygro transmitter (Mode 1) and rain sensor (Mode 2) is not displayed
on the display, user shall check the following points:
1. The distance of the Weather Station or transmitter/ rain sensor should be at
least 1.5 to 2 metres away from any interfering sources such as computer
monitors or TV sets.
2. Avoid positioning the Weather Station onto or in the immediate proximity of
metal doors or window frames.
3. Using other electrical products such as headphones or speakers operating on
the same signal frequency (868 MHz) may prevent correct signal transmission
and reception.
4. Neighbours using electrical devices operating on the 868 MHz signal frequency
can also cause interference.
5. "Visibility" of weather station and transmitter (e.g. through a window) increases
the range.
Note:
When the 868 MHz signal is received, do not re-open the battery compartment cover
of either the transmitter/ rain sensor or Weather Station, as the batteries may spring
free from the contacts and force a false reset. Should this happen accidentally then
reset all units (see Setting up above) otherwise transmission problems may occur.
During normal operation, after the outdoor display shows "- - -", the weather station
will change to receive the outdoor data every 15 minutes, until the data is read. Then
the reception period for thermo-hygro transmitter will return to 4.5 seconds (6.25
seconds for rain sensor).
If no reception is possible despite the observation of these factors, all system units
have to be reset (see Setting up).
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