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

Switching unit


The switching unit is used for the processor controlled switching and attenuation of HF signals in the frequency range 1.5 … 30 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
-    attenuator modul, adjustable 0 … 63 dB
-    I/O boards
-    processor board
-    RS-232 interface
-    manual control module

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 and via a manual control module with a LC display and pushbuttons which is integrated 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 displayed on the manual control module.
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:2 switches SP4T
8 attenuators 0 … 63 dB
Switching specifications
Impedance:50 Ohm
Frequency range:1.5 … 30 MHz min.
Insertion loss:0.5 dB max.
Isolation:80 dB min.
VSWR:1.5 : 1 max.
Input power:+ 10 dBm min.
Switching elements:failsafe relays
Switching time:20 ms max.
Attenuation0 … 63 dB
Step width1 dB
1-, 2-, 4- & 8-dB steps0.1 dB
16- & 32-dB steps0.2 dB
Further specifications
Manual controlLCD (4x20) and pushbuttons (3x6)
RF connectors:BNC female, 50 Ohm
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)
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