As with all functions of the appliances presented on these pages, you need to read closely the section of the manual concerning long distance transmission of information.

A reminder of the steps to follow wouldn’t however be pointless ...to avoid installation errors:

** Check the +/- of the batteries
** Use fully charged batteries (1,5 V) for operation of the appliance, because all the energy is necessary during use, that is during coding of transmissions
** The use of rechargeable batteries is strongly advised against because they are never at maximum power
** Respect the order of insertion of batteries as shown in the manual (be it batteries first in the station, then in the transmitter.. or textthe opposite, this depends on the appliance)
** Do not install the base or transmitter without first making sure that the chosen positions are within the correct transmission radius, and are not affected by interferences of any kind....

In case of incorrect display of outdoor temperature and/or relative humidity a few minutes after insertion of the batteries, wait to see what happens before switching the appliances on again:

1) The transmissions at 433MHz or at 868 MHz are also prone to interference from monitors or televisions. Place them preferably 2 metres away from such appliances.
2) Avoid placing the appliances on or immediately next to metallic walls. Pay attention to the phenomena known as Faraday casing.
3) The use of other appliances such as earphones, babysitters, or speakers using the same frequency (433/868 MHz) can interfere with the reception of the transmission
4) Interferences can also be caused by neighbours using appliances on the same 433/868 MHz frequencies...It has even been known for some owners of our weather stations to pick up the transmitters of their neighbours!

During usage, any appliance which operates a long distance transmitter will seek immediately to communicate with the distant wave. And this, either on the 433 MHz, or the 868 MHz frequencies, depending on the type of appliance you have chosen.

During the first configuration of a Station (Weather or Temperature) automatic programming starts, which the user cannot alter. This way, the appliance learns the various transmission codes of the appliance or sensors. This procedure ensures a precise allocation between all parts of the system and therefore ensures transmission of signals.
This process of learning takes place at the same time as the reception of the first valid data and the first data to be displayed on the LCD. This can be recognised by brief illumination sequence of the various display elements during the tests. When all the tests are carried out, the data from the readings are displayed on the LCD.

A large majority of the appliances presented on these pages can deal with several outdoor wavelengths: three for most of the time.
Operation is extremely simple: to ensure that the coding will function correctly between the base and the various transmitters, restart the entire system. The base will automatically locate all the transmitters that you want to attach to it, and will number them automatically -1- -2- -3- The locations of the wavelengths will be displayed on your appliance’s LCD.
To move from one wavelength to another, simply press on the appropriate function button. (Read the appliance manual) .

On certain stations, and especially on the "Météo Pro" stations, the transmission distance can be increased by the addition of High Frequency repeaters (As an option).
The total transmission distance for the sensors can be increased to 400 m.

The environment surrounding a long distance transmission appliance isn’t sadly exempt from all types of interference!

In the disorder :

- Interferences caused by badly insulated computer equipment.
- High power High Frequency Antennas.
- Metal storage shed construction.
- In certain cases, very dense vegetation.

Don’t forget for example :

- The transmission distance of an anemometer can be affected by metallic rooves or glass wool insulations containing aluminium.
- The presence of surfaces that conduct radio waves not far from the wavelengths or receptors affects the total distance of transmission of signals.
- More and more significant interferences in urban areas can in certain places reach levels which can permanently or intermittently disturb the 433 MHz signals. Thus in cities, long distance transmission displays can disappear from LCD screens.. only to reappear a few hours later. There isn’t so much a malfunction in the appliance but there is intermittent interference.
- In the case of regular interferences, the simplest and most effective remedy and one which most often consists of reinstalling the appliances away from sources of disturbance.

Users are advised to ensure the correct reception of 433/868 MHz transmissions before permanently installing the appliance and outdoor sensors.
In case of non reception at and/or from the chosen location, move the appliances slightly until you get reception. Once the signals are received, place the appliances permanently.

Do not place the appliance and/or the outdoor transmitters in places where they are exposed to sudden changes in temperature: direct sunlight, extreme cold, constant rain and permanent humidity, since these products have been designed to be used in known and average contexts. This will help to avoid inaccurate readings and any possible damage to the delicate electronics that make them function.

If an appliance must be moved to a place notably higher or lower than where it is found, restart the appliances or ignore the readings for the next 12 to 24 hours. This will give the appliance time to function at a constant altitude and thus draw up more accurate forecasts.. You will notice that the moving of a weather station from the ground to the first floor of a house can lead to a surprising change in forecasts...

The measure used in Europe is degree Celsius, commonly known as “Centigrade” which is displayed as °C. This is a measure using the principles of the decimal system.
Two simple guidelines: at 0°C, ice becomes liquid and at 100°C, water boils.

Degrees Fahrenheit are used in certain Anglo-Saxon countries and mainly in the United States. In Fahrenheit, ice becomes liquid at 32°F and water boils at 212°F.

The ‘felt temperature’ or “ Wind-chill” is the fictitious temperature that we feel in certain conditions, especially in low temperatures and a considerable wind.
This is why only appliances which have an anemometric and thermometric sensor can display this “felt temperature”.

A very sophisticated weather station may take into account the wind-chill calculation, solar radiation, the reflection of light on clouds, and the wavelengths of light.