User's Manual

SATELLINE-3AS

User Guide, Version 2.2

3.2 Receiver

The sensitivity of the receiver depends on the channel spacing of the radio modem (=data

speed of the radio interface) and on the mode of the FEC (error correction) according to the

table below:

FEC OFF FEC ON

25 kHz -110 dBm -113 dBm

12,5 kHz -112 dBm -115 dBm

Effect of settings on the receiver sensitivity

The Signal Threshold Level setting of the receiver determines a level, above which the search for

the actual data transfer signal is active. It is recommend that values given in the table are used.

If the Signal Threshold Level setting is set too low (the CD-LED is ON constantly), it is possible

that the receiver is trying to synchronise itself with noise, in which case, the actual data

transmission might remain unnoticed. Alternatively, weak data transmissions will be rejected,

even though they would be otherwise acceptable.

SATELLINE-3AS Epic –radio modem contains two separate receivers, and a selection is made

between the received signals in order that the stronger/better signal is used. By using this

method, the signal fading caused by multipath propagation will be smaller than if just one

antenna and receiver are used. The recommended minimum distance between receiving

antennas is ¾ wavelength, which at a frequency of 450 MHz corresponds to a distance of 50

cm.

NOTE!

Setting the radio data modem output power level to that which exceeds the regulations se

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 o

penalties arising from the operation of its radio equipment in ways contradictory to local

regulations and/or requirements and/or laws.

SATELLINE-3AS Epic radio modem is shipped with two different cooling elements. If the

transmitter of the radio modem is to be ON full power over 20 % of the operating time,

additional cooling is required.