User guide

SATELLINE-3AS NMS / NMS Epic / NMS 869 / VHF
User Guide, Version 1.0
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9
TESTS
9.1
Test messages
The radio modem can be set to transmitting mode with two kinds of test messages - the Short
block test and the Long block test . These can be utilized for example when directing antennas
during system installation.
It is recommended to use the following data speed at the serial port of the receiving radio
modem: 38400 bps @ 25 kHz radio channel spacing and 19200 bps @ 12.5 kHz.
The test transmissions can be started and stopped in the Programming menu , LCD menu or
SATEL NMS PC program.
9.1.1
Short block test
In this test mode the radio modem sends a test message that is preceded by a consecutive serial
number and terminated by the Line Feed character. The short data block transmission is
followed by a 200 ms delay after which the transmission sequence will be repeated until the test
is stopped.
Short data block test is suitable for running data communication tests. Error-free reception of
data can be monitored using a terminal program, for example SaTerm Lite .
Example of a short data blocks:
$test3AS VHF ,0,1,S/N:0000000000, test line of SATELLINE – 3AS VHF ,E99C
9.1.2
Long block test
In this test mode the radio modem transmits test message continuously for 40 s. Then the
transmitter is switched OFF for a 10 seconds break. This transmission sequence is repeated
until the user stops it.
This test can be used in order to measure the transmitter output power, standing wave ratio
(SWR) of the antenna system or received signal strength (RSSI level) at the receiver stations.
NOTIFICATION
When Long block test is used with the full output power (10 W) of SATELLINE-3AS NMS Epic, the
radio modem must be the version equipped with a cooling element.
If the Epic doesn’t have the cooling element, maximum allowed Tx output power in Long data
test is 1 W.