European Telecommunications Standards Institute (ETSI) has released a new frequency band for narrow and broadband ISM-purposes (Industrial, Scientific, and Medical). The 868 ... 870 MHz band is divided into sub-bands according to transmit power (max 0.5W) and duty cycle allowed for the transmitter.

SATEL’s EASy 869MH has a  869.4 ... 869.65 MHz frequency band. This band has 10 separate 25 kHz channels for a maximum power of 0.5 W ERP* and 10% of transmitters duty cycle. Transmitter duty cycle and the maximum constant transmission time (max 36 seconds) must be controlled by data terminal equipment. Other features of the modern SATELLINE 3AS version are equivalent with the original 450 MHz version.

Note! Propagation of radio signals at higher frequencies differs from the propagation at lower frequencies. The rule of thumb is that when you double the frequency you cut the communication distance in half. So compared to the 450 MHz version the maximum communication distance is half when SATELLINE 3AS 869 MHz version is used.  There is now an OEM version of this product the M3-TR8, it requires more engineering, but is designed to fit neatly into any existing solution.

 SATELLINE-EASy and -EASy 869 brochure

 SATELLINE-EASy and -EASy 869 user guide 

M3-TR4 OEM version

General Information

Please also read the following important notes:

It is the recommendation ERC/REC 70-03created by the radio communications committee of CEPT, which sets the technical requirements for the licence exempt use of short range devices on harmonised frequency bands around the Europe. CEPT members (spectrum authorities) have to either follow the recommendation in their frequency management or inform the CEPT radio communications committee about any restrictions. Those national restrictions are listed and attached to the ERC/REC 70-03 document.

License exempt 500 mW sub band


The sub band 869.400 - 869.650 MHz on the 869 MHz range is specified for

0.5 Werp (radiated power, in reference with a half wave dipole antenna, 0 dBd = 2.15 dBi). On this band, there are 10 x 25 kHz channels with centre frequencies











           869.6375 MHz.

           = acc. to formula ( 869.400 MHz + 25 kHz/2 ) + N x 25 kHz ; N=0…9


The official Satel recommendation is to always use the latest firmware version for the Satel radio modems. Please do find the latest firmware version for the SATELLINE EASy 869 and SATELLINE EASy-M3-TR1 869 products behind this link


The latest ETSI specification regarding this matter is dated 5-2012. Since the earlier than 3.63.4 firmware versions for the SATELLINE EASy 869 and SATELLINE EASy TR1 doesn’t have the automatic duty cycle limitation, the duty cycle limitation has been left to the responsibility of the connected hardware as an upper layer application task.


Defenition for the duty cycle:

For the purposes of the present document the duty cycle is defined as the ratio, expressed as a percentage, of the maximum transmitter "on" time monitored over one hour, relative to a one hour period.


If the upper layer application is not capable of limiting the duty cycle to the ETSI specification requirements, the firmware of the SATELLINE EASy 869 and/or SATELLINE EASy-M3-TR1 869 products shall be updated to the required minimum level, version 3.63.4.


Please do note that after updating elder than 3.63.4 firmware version to the latest version, the Subband(frequency range) of the radio modem shall be selected by the user in order to take the automatic duty cycle limitation in use in the radio modem. This task can be executed either from the programming menu via terminal connection, via LCD user interface or via SL –commands with terminal connection.

 IMPORTANT! Please remember that it is the customers responsibility to ensure that the chosen radio frequency is clear and available for use, and that any required fees are paid and correct licences obtained.  Xl Systems Ltd. accepts no responsibility or liability for system failure or legal procedings either due to radio interference from a third party, or failure to comply to logal regulations.

© XL Systems 2019