DEV 2190 - Connection of RF Signal Cables

User Manual DEV 2190
 Copyright DEV Systemtechnik GmbH 2009-2017 29
If the basic network setup via serial interface is required (chapter 4.4.2.2), a serial
connection between a PC and the serial connector of the CPU module labeled "Com"
(Com) is to be established using a 1:1 cable; the configuration of the serial interface
is described in chapter 4.4.1.
Finally, for the power cords it is recommended to use two separately fused phases
of the available electrical outlets. As stated in chapter 2.3, connect two power
cords sequentially to the primary connectors (P1 & P2).
Note:
 Again, the two power lines must not be powered up simultaneously otherwise
this may cause severe damage of the device!
 It is highly recommended to power-up the device after the installation of all
signal cables (chapter 4.2.3).
 The power lines are fused separately; the fuse holders (F1 & F2) are located
below the corresponding power inlet (P1 & P2). If a fuse has to be exchanged,
unplug the device completely and use 6 A T 5*20 mm glass fuses for
replacement only!
4.2.3 Connection of RF Signal Cables
Apply strain relieves to the external RF signal cables which are to be connected in a
way that the connectors of the device are not stressed mechanically.
If the DEV 2190 is already powered up and before the RF signal cables are to be
connected to the chassis, the LNB power of all amplifier modules is to be turned
off! Otherwise, there is a risk that a high impulse current degrades the RF
performance of the corresponding RF input connector.
First, connect the RF input cables (e.g. from the LNB) to the corresponding RF input
ports of the chassis; 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 applied BNC connectors
make sure that the bayonet of each BNC connector is locked.
Note:
 For 75 Ohm RF connectors, either female 75 Ohm BNC connectors or female
precision F connectors are applied. Make sure, that the applied connectors are
male 75 Ohm BNC connectors or male precision F connectors (with thin inner
conductor).
 Each unused 50 Ohm SMA output (input) port of a distribution (combiner)
option has to be terminated with a 50 Ohm SMA load to achieve best
amplitude frequency response.
 Each unused 75 Ohm F (or BNC) input port of a combiner option and each
unused 75 Ohm F (or BNC) output port of a distribution option or of an
IRD controlled switch option has to be terminated with a 75 Ohm F (or BNC)
load to achieve best amplitude frequency response.