-6-
v7.0
Hardware
The user must keep in mind that there are two different antennas for LoRa modules regarding the frequency band: 868 or 900
MHz. Although the appearance of these antennas is the same, the user must choose which one needs to be purchased.
Note:
It is not recommended to work without an antenna screwed to the module. The module could be damaged due to RF reflections.
The frequency used in Europe is the free ISM band of 868 MHz, using 8 channels with a bandwidth of 0.3 MHz per channel. That
is shown in the following figure.
Figure: Frequency channels in the 868 MHz band
Note:
These channels were chosen arbitrarily, according to the UN-111 appeared in the Spanish BOE-A-2013-4845. If necessary, users
can select the appropriate channels according to their country regulations.
The frequency used in USA, Canada, Australia, Singapore or Israel is the free ISM band of 900 MHz, using 13 channels with a
bandwidth of 2.16 MHz per channel. It is shown in the following figure.
Figure: Frequency channels in the 900 MHz band
Note:
These channels were chosen arbitrarily; they fit the channels used by the equivalent XBee 900 MHz. If necessary, users can select
the appropriate channels according to their country regulations.
