57
General information about radio operation
such as humidity in the vicinity have an important role to play, as do
on-site structural/screening conditions.
11.1 Notes on rectifying malfunctions
•
No reception – the distance between the transmitter and re-
ceiver is too long.
Reduce the distance between transmitter and receiver.
•
No reception – materials with good shielding properties are
located between the transmitter and the receiver (thick walls,
reinforced concrete, etc.).
Find another position for the transmitter or the receiver. Please re-
fer to sec. “11 General information about radio operation” on page
56 as well.
•
No reception – transmitter batteries are empty.
Replace the batteries.
•
No reception – the transmitter is subject to a source of inter-
ference (wireless device, wireless headphones/loudspeaker).
Eliminate the source of
interference or find another position for the
transmitter or the receiver.
Often the interference is only present on a temporary basis (radio
telephony) or can be eliminated very easily. If radio headphones,
wireless baby monitors or other similar devices are operated at 868
MHz in your home or in the neighbourhood, for example, they are
usually only switched on for a limited period of time. The majority of
these devices can be moved to an interference-free frequency and
a measure such as this can mask interference very effectively.
•
Wireless sensor interferes with other devices in the 868 MHz
band.
Transmissions from the wireless sensor can interfere temporarily
(every 3 min. for around 100 ms) with other devices working on the
same channel.
