|
PRODUKTER - SATEL
RADIO DATAMODEM
SATELLINE-3AS 869 MHz New
Frequency Version of SATELLINE-3AS
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 newest version of 3AS uses the 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 older 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.
|
