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Taking this into account, the unit can also show how the weather has changed
and is expected to change. For example if the arrow pointing downwards is
displayed together with cloud and sun weather icons, then the last noticeable
change in the weather was when it was sunny (the sun icon only was shown).
This means that the next change in the weather will be rainy icons since the
tendency arrow is pointing downwards.
Note: The weather tendency indictor arrows remains on the LCD regardless
of the current weather. For example, if the current weather is raining,
and the arrow is pointing downwards, it means that the weather will
remain poor and if the weather is sunny and the arrow is pointing
upwards, it means that the weather is expected to remain fine.
Storm warning
If the air pressure drop of more than 4mbar within last 6 hours, the downward
tendency arrow above the weather icon will flash as an indication of possible
storm. Flashing will stop when the air pressure stays stable for several hours
or starts to increase.
Relative air-pressure hPa
Underneath the weather icons is the air pressure reading which is recorded
constantly in hPa and the Weather Station displays this reading as the relative
air pressure.
Air pressure history (electronic barometer with barometric
pressure & trend)
The bar chart indicates the air pressure trend over the last 72 hours in 8
steps, 0, -1, -3, -6, -12, -24, -48 and -72 (hours). The bar is plotted by at each
of the 8 steps and gives the trend over the recorded period and the scale on
the right (0, ±1, ±3, ±5 & ±7) compares the result . The "0" in the middle of this
scale is equal to the current pressure and each change (±1, ±3, ±5 & ±7) is
how high or low in "hPa" the past pressure was compared to the current.
If the bars are rising it means that the weather is getting better due to the
increase of air pressure. If the bars go down, it means the air pressure has
dropped and the weather is expected get worse from the present time "0".
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P.30
inserting the batteries and the DCF-77 signal is not received, then check the
following list before manually setting the time (see Manual time setting below):
1. The distance of the units should be at least 1.5 - 2.0 metres away from
interfering sources such as computer monitors or TV sets.
2. Avoid placing the units onto or in the immediate proximity of metal window
frames.
3. Within thick concrete rooms such as basements and tower blocks, the
DCF-77 frequency signal is naturally weaker for reception. In extreme
cases, place the unit closer to a window and/or point its front or rear towards
the Frankfurt transmitter (avoid placing near metal frames and structures).
Note: Users may be located in areas where atmospheric disturbances are
the direct result of not receiving the DCF-77 frequency signal. During
nighttime, atmospheric disturbances are usually less severe and
reception is possible in most cases. With a single daily reception, it is
adequate for the Weather Station to keep time deviation to below 0.5
seconds in a period of 24 hours.
When reception is successful, the DCF-77 tower icon will start flashing
on the LCD as a sign that the signal has been located and is about to
be received. Once the signal has been "locked", the DCF-77 tower
icon will stay fixed on the LCD and the received time will then correct
the manually set time.
Checking for 433 MHz reception:
The same as the DCF-77 signal, the Weather Station will automatically start
scanning for the 433 MHz signal after the batteries are inserted. If the outdoor
temperature is not displayed after about 30 seconds, then check the following
list before resetting the units (see Resetting below):
1. The distance of the Weather Station should be at least 1.5 - 2.0 metres
away from interfering sources such as computer monitors or TV sets.
2. Avoid placing the units onto or in the immediate proximity of metal window
frames.
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P.32
Note: For accurate barometric pressure trends, the Weather Station should
operate at the same altitude for example it should not be moved from
the ground to the second floor of a house. Should the unit be moved to
a new location, reset both the transmitter and Weather Station as this
will prevent the slight change in location registering as a possible change
in air pressure.
After the resetting or setting up, weather readings should be discarded
for the next 12 to 24 hours as this will allow sufficient time for the Weather
Station to operate at a constant altitude and thus enabling an more
accurate reading.
Outdoor Temperature Reading:
The outdoor temperature is displayed underneath the weather icons section.
The Weather Station will automatically start scanning transmitter's 433 MHz
signal after the batteries are inserted and once received, the outdoor temperture
will appear on the LCD.
Minimum and maximum outdoor temperature recordings:
On the bottom line of the LCD are the outdoor minimum and maximum
temperature recordings. These are simultaneously displayed for a constant
update and easy reading. When a new temperature low or high is reached, it
will be updated and recorded into the Weather Stations memory.
Resetting minimum and maximum temperatures
The minimum and maximum temperatures of the Weather Station can be
reset simply by pressing the RESET key. The minimum and maximum
temperature records will not be resets until a new reset is performed (i.e the
records are for the period between the last reset and the new reset). Once the
RESET key is pressed, the data resets to the current temperature.
Checking for DCF-77 reception:
The Weather Station will automatically start scanning for the DCF-77 frequency
signal (time signal transmission) after the batteries are inserted. In normal
surroundings (for example away from interfering sources such as TV sets), it
takes between 3 - 5 minutes to receive the signal. If after 10 minutes of
3. Using other electrical products such as headphones and speakers that
operate on the same frequency signal (433 MHz) may prevent the
transmission pick up.
4. Neighbours using electrical items operating on the 433 MHz signal can
also cause interference.
Note: When the 433 MHz signal for the outdoor temperature has been
received, do not re-open the battery cover to either the Weather Station
or transmitter as the batteries may accidentally spring free from the
contacts and force a false reset. Should this happen then reset both
units (see Resetting below) otherwise transmission problems may
occur.
The transmission range from the temperature transmitter to the Weather
Station (433 MHz) is up to 25 metres in open space, but again this
depends on the surrounding environment and interference levels. If
reception is still not possible, then reset both units (see Resetting
below).
The transmitter's transmitting range may be affected by exposure to
extreme cold conditions (-25°C) for long periods of time. Should this
happen, the 433 MHz signal may be weakened and therefore result in
shorter transmitting distances. The contrast of the LCD may reduce
due to the power reduction of the batteries caused by such sub-zero
temperature levels.
Resetting:
1. Remove batteries from both the Weather Station and the transmitter
2. Wait at least 30 seconds and then repeat the procedures specified in Setting
up (above).
Note: Always wait at least 30 seconds after removing the batteries before
reinserting, otherwise start up and transmission problems may occur.
Also, remember when resetting, that both units have to be reset and to
always reinsert the batteries to the transmitter first.
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P.31
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P.33
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