User's Manual

SATELLINE-4Pro
User Guide v0.93 DRAFT
22
7 RF INTERFACE
The SATELLINE-4Pro has a single TNC type RF-connector with impedance of 50 Ohm.
When the modem is supplied the frequency is set to “default channel”. The user can change the
frequency afterwards by 63.82 MHz. Of course, all local regulations set forth by the authorities
must be taken into consideration.
The data speed of the radio interface is set to “default speed”. It can also be set afterwards.
A channel spacing of 25 kHz enables a data speed of up to 28800 bps and a channel spacing of
12.5 kHz enables, correspondingly, a data speed of up to 14400 bps. The data speed of the radio
interface is always fixed depending on the modulation setting irrespective of the data speed of the
serial interface. If the data speeds of the radio interface and the serial interface differ from each
other, the radio modem will buffer the data in transfer temporarily, so no data loss will occur.
7.1 Transmitter
The output power of the transmitter is adjustable. The greatest allowable power depends on limits
set by local authorities, which should not be exceeded under any circumstances. The output power
of the transmitter should be set to the smallest possible level, which still ensures error free
connections under variable conditions. Large output power levels using short connection distances
can, in the worst case, cause disturbances to the overall operation of the system.
Table:Typical output power levels.
NOTE!
Setting the radio data modem output power level to that which exceeds the regulations set forth by
local authorities is strictly forbidden. The setting and/or using of non-approved power levels may
lead to prosecution. SATEL and its distributors are not responsible for any illegal use of its radio
equipment, and are not responsible in any way of any claims or penalties arising from the operation
of its radio equipment in ways contradictory to local regulations and/or requirements and/or laws.
OUTPUT POWER dBm
2 W +33
10 W +40
20 W +43
25 W +44
35 W +45,4