User Manual DEV 2194
Copyright DEV Systemtechnik GmbH 2013-2017 13
First, connect the RF input cables (e.g. from the LNB) to the corresponding RF input
port(s); then connect the RF output cables (to the signal receivers) to the related
RF output ports.
When connecting RF cables to the chassis, each connector providing a thread is to
be tightened with a torque wrench. The torque applied to 75 Ohm F connectors
should not exceed 4.5 Nm (39.8 lbf-in). In case of 50 Ohm SMA connectors a torque
wrench adjusted to 1 Nm (8.85 lbf-in) is to be used. For the BNC connectors of the
output ports make sure that the bayonet of each BNC connector is locked.
Note:
For 75 Ohm RF connectors, female 75 Ohm BNC connectors and female
precision F connectors are applied. Make sure, that the applied connectors are
male 75 Ohm BNC connectors and male precision F connectors (with thin inner
conductor).
Each unused output port of a distribution amplifier has to be terminated with a
75 Ohm BNC load to achieve best amplitude frequency response.
If all cables are connected, the device can be powered up.
If the device is set up to operate as a 1:16 distribution amplifier (please refer to
chapter 3.1.3) and if the input is required to deliver LNB power, it is not recom-
mended to supply the sink (e.g. an LNB) with LNB power from both amplifiers
(i.e. parallel supply). Due to variations of parts, the current load for the ampli-
fiers will not be balanced and the current monitoring will not work properly.
4.3 Device Factory Settings
The product is delivered with factory settings as described in the following.
It is possible to restore these settings via Web Interface, please refer to
chapter 5.4.7.4.1.
4.3.1 Factory Settings for the Amplifiers
The amplifiers provide RF level monitoring functionality, i.e. the aggregated signal
power level of the RF signal is measured and compared with an RF threshold level.
If the signal level is below the threshold level, an alarm is triggered which is
indicated (e.g.) via LED. The factory setting for the RF threshold level is:
RF Threshold Level: (20 dB above lower limit)
Here the lower limit is -50 dBm, i.e. the factory setting for the RF threshold level
is -30 dBm. The RF threshold level can be adjusted via Web Interface (please refer
to chapter 5.4.4.1) or via SNMP (chapter 5.5.4.3.9.6).
The amplifiers are capable of providing LNB power (bias) at the RF input. With the
current monitoring functionality, the current delivered by the input is monitored. If
the measured current exceeds the defined interval, an alarm is triggered which is
indicated (e.g.) via LED. The factory settings for the current monitoring interval are:
Lower Limit: 100 mA
Upper Limit: 250 mA
The lower limit and the upper limit of the current monitoring interval can be
adjusted via Web Interface (chapter 5.4.4.1) and via SNMP (chapters 5.5.4.3.9.10 &
5.5.4.3.9.11).
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