Your contact partner for this product is: Michael Hirschmueller ǀ +49 9078 9695-95 ǀ

Switching unit


The switching unit is used in the ASTRA ground control station. It serves for switchover of 4 groups of signals, each with 3 inputs to 3 outputs in the frequency range 40 … 100 MHz.


The switching unit is housed in a 3 U 19“ subrack with very good RF shielding and consists of the following sub-assemblies:

-    relay switches SP4T and SPDT
-    I/O boards
-    processor boards
-    RS-422 interface
-    manual control (optional)

All the necessary signal, power supply and earthing connections are provided at the rear.
The mains switch and the manual control pushbuttons are located on the front panel.


The unit is controlled via a RS-422 interface and via pushbuttons located on the front panel.

Special features

The I/O boards are monitored in a processor routine.
The selected crosspoints as well as the I/O fault messages are indicated with LEDs.
A status string can also be requested at any time via the control interface.
The unit is constructed using a modular approach utilising 19” plug-in sub-assemblies which enable ease of installation and maintenance.

Technical datameasured at 25 °C
Configuration:coaxial switches SP4T and SPDT
with internal termination
Switching specifications
Impedance:50 Ohm
Frequency range:40 … 100 MHz min.
Insertion loss:0.25 dB max.
Return loss:20 dB min.
On/off70 dB min.
Switching elements:latching relays
Switching time:25 ms max. (without processor time)
Switching cycles:1 million min.
Further specifications
Control:RS-422 or tbd.
Manual control:pushbuttons and indication by LED
Signal connectors:
Coaxial switchesBNC female, 50 Ohm
Control inputD-Sub female 9-pin
Power supply:195 … 264 VAC, 47 … 63 Hz
Connector3-pin, with mains filter and fuses
Mains switch:with integrated lamp
Temperature range:
Operating0 … 50 °C
EMC:in accordance with European standard EN 55022 and EN 50082-1/2
Height3 RU
Depthabout 360 mm (without connectors)
Front panel:painted light grey (RAL 7032)