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

Switching unit


This unit is used for the computer controlled switching and attenuation of RF signals in the frequency range DC … 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 SP4T
-    power divider 4-way
-    attenuator
-    control logic
-    RS-232 interface
-    manual control

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


The unit is controlled via a RS-232 interface.

Special features

The I/O boards are monitored in a processor routine.
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:5 power divider 4-way
2 switches SP4T
4 attenuators 63 dB, switchable in 1 dB steps
Switching specifications
Impedance:75 Ohm
Power divider:
Frequency range1.5 … 30 MHz
Frequency rangeDC … 100 MHz
Isolation60 dB min.
Insertion loss1.0 dB max.
VSWR1.5 : 1 max.
Frequency rangeDC … 100 MHz
Attenuation0 … 63 dB in 1 dB steps
Insertion loss1.0 dB max.
VSWR1.4 : 1 max.
RF power:+ 10 dBm min.
Switching time:20 ms max.
Switching cycles:1 million min.
Further specifications
Control:RS-232, RS-485
Manual control:LCD (4x20) and pushbuttons (3x6)
RF connectors:BNC female, 50 Ohm
Power supply:95 … 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 300 mm (without connectors)
Front panel:painted light grey (RAL 7032)
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