Attenuator Module AMR0100


Product Description

The module is used for digital controlled attenuation of HF signals in the frequency range DC … 30 MHz.


The switching module is housed in a 3 U, 7 HP
19“ cassette with very good RF shielding.
To improve the heat dissipation the surface is anodized in black colour. It consists of the following sub-assemblies:

–    relay switches for attenuation control
–    logic circuit
–    relay driver circuits


The module is controlled via a BCD coded TTL  signal.

Special features

The mechanical dimensions are designed to combine several modules together with power supply units and a microcontroller in a 19“ subrack. For this purpose the module can be equipped with a 19” 3 U front panel.

Technical data measured at 25 °C
Configuration: 1 input, 1 output
attenuator, 0 … 63 dB
Impedance: 50 Ohm
Frequency range: DC … 30 MHz min.
Attenuation: 63 dB in 1 dB steps
(1-2-4-8-16-32 dB)
Insertion loss: 1.5 dB max., 1.0 dB typ.
Accuracy: +/- 0.1 dB per step at 1-2-4 dB
+/- 0.3 dB per step at 8-16-32 dB
VSWR: 1.5 : 1 max.
Input power: 3 Watt CW max.
Switching time: 10 ms max.
Switching cycles: 1 million min.
Further specifications
Control: TTL, BCD coded
Connector D-Sub, 9-pin
RF connectors: BNC female, 75 Ohm
Power supply: + 5 VDC, 300 mA
Temperature range:
Operating – 10 … 60 °C
EMC: in accordance with European standard EN 55022 and EN 50082-1/2
Height 3 U (128 mm)
Width 7 HP
Depth about 170 mm (without connectors)
Front panel: anodized or painted (RAL7032)