Product/Service

Rotary Step Attenuators

Source: Trilithic Inc.
Trilithic's RSA series rotary attenuators are recognized worldwide as the standard for durable, precise signal level control
Trilithic's RSA series rotary attenuators are recognized worldwide as the standard for durable, precise signal level control. The series is divided into both 50 and 75 ohm units with attenuation as high as 110 dB dynamic range (in 10 dB steps), or as low as 1 dB range ( in 0.1 dB steps). A firm, snap action detent locks in the desired attenuation as indicated on the supplied control knob. Low VSWR and insertion loss is assured throughout the range of each unit with tightly controlled pad values and machining tolerances.

Rotary Step Attenuator Features:

  • Wide Frequency Range
  • High Accuracy Rate
  • Low VSWR
  • Price Competitive
  • Flexible Design Configurations

Trilithic's new state-of-the-art rotary step attenuators are designed for precision control of signal levels in the DC to 3.0 GHz range and are offered in a wide choice of values and increments. This new design allows for greater automation of assembly and unprecedented low cost. Please contact the factory for your custom attenuator needs.

Specifications - Rotary Step Attenuators
  RSA-3501 RSA-3510 RSA-35100
Frequency Range DC to 1GHz DC to 3 GHz DC to 3 GHz
Impedance 50 Ohms 50 Ohms 50 Ohms
Attenuation 0 - 1 by .1 db 0 - 10 by 1 dB 0 - 100 by 10 dB
Average Power 2 Watts (25 Degrees C) 2 Watts (25 Degrees C) 2 Watts (25 Degrees C)
Switching Life 200,000 Steps Minimum 200,000 Steps Minimum 200,000 Steps Minimum
Rotation Clockwise for increasing Clockwise for increasing Clockwise for increasing
attenuation in 30 degree indexing attenuation in 30 degree indexing attenuation in 30 degree indexing
Connectors Female: SMA, BNC, TNC, N Female: SMA, BNC, TNC, N Female: SMA, BNC, TNC, N
(BNC not recommended above 1 GHz) (BNC not recommended above 1 GHz)
Housing Aluminum and Zinc Aluminum and Zinc Aluminum and Zinc
Knobs Knobs are included with every attenuator Knobs are included with every attenuator Knobs are included with every attenuator
Insertion Loss 0.0-1.0 GHz 0.9 dB max 0 - 1.0 GHz 0.3 dB max 0.0 - 1.0 GHz 0.25 dB max
1.0 - 2.0 GHz 0.5 db max 1.0 - 2.0 GHz 0.50 dB max
2.0 - 3.0 GHz 0.7 db max 2.0 - 3.0 GHz 0.75 dB max
  3.0 - 4.0 GHz 1.10 dB max
Accuracy DC - 1.0 GHz /- 0.05 dB 0 - 1.0 GHz /- 0.25 dB 0.0-1.0 GHz /- 0.25 dB or 1.5%* 
1.0 - 2.0 GHz /- 0.35 dB 1.0-2.0 GHz /- 0.35 dB or 2%* 
2.0 - 3.0 GHz /- 0.50 dB 2.0-2.5 GHz /- 0.50 dB or 2%* 3%
  2.5-3.0 GHz 0.50 dB or 3%* 6%
    *Whichever is greater  
VSWR/ Return Loss FREQUENCY RANGE VSWR FREQUENCY RANGE VSWR FREQUENCY RANGE VSWR
DC - 1.0 GHz 1.25:1 max 19.1 dB max DC - 1.0 GHz 1.25:1 max 19.1 dB max 0.0-1.0 GHz 1.25:1 max 19.1 dB max
  1.0 - 2.0 GHz 1.35:1 max 16.5 dB max 1.0-2.0 GHz 1.35:1 max 16.5 dB max
2.0 - 3.0 GHz 1.50:1 max 14.0 dB max 2.0-3.0 GHz 1.50:1 max 14.0 dB max

Download the Rotary Step Attenuator Catalog Pages

For information on other Attenuators from Trilithic click on the links below.