The Vb273 Dvb-S/S2 Redundancy Switch (Vb220 Option) - BridgeTech VB20 User Manual

4.7.9 The VB273 DVB-S/S2 Redundancy switch (VB220 Option)

The VB273 DVB-S/S2 satellite IF redundancy switch is an input module capable of
automatically switching between two IF input signals for redundancy purposes. It is
meant to be paired with a VB272-SMA DVB-S/S2 input module described in an earlier
section. The VB273 module has two 75 Ohm BNC IF inputs; one 75 Ohm BNC IF output
and two 50 Ohm SMA RF outputs.
The module contains two built-in upconverters to L-band for monitoring purposes. The
L-band signal versions of the input IF signals are available on the two 50 ohm SMA
connectors marked RF OUT 1 and RF OUT 2. These signals are permanently connected
via supplied loop cables to the neighbouring VB272 Satellite input module.
Chassis setup:
A VB120 or VB220 (Controller card) must be in the leftmost slot in the chassis, the
VB272-SMA must be placed in the middle slot and the 273 blade in the slot to the
right. The RF out 1 and RF out 2 should be connected to their corresponding
connector on the VB272 blade.
The VB273 is built with high reliability and redundancy in mind. The switching
operation is performed by robust bistable relays. This means that if the power should
disappear from the chassis or even if the VB273 module is pulled out of the chassis
the signal path remains in its latched position.
The module is remote controllable via the GUI and in addition there is a button
interface consisting of 3 push buttons for manual override, this is futher explained in
the chapter regarding Satellite Redundancy(6.16).
LED indicators clearly show the current path of the IF signal as well as the operating
mode of the module.
The connectors are:
IF in 1: 75 ohm female BNC for 70 MHz IF signals as found in satellite
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uplink scenarios. First input terminal. The input signal level
should lie in the range -15 dBm to 0 dBm in order to guarantee
a correct level on the upconverted RF out 1 terminal
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