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The Elecraft AT1 is a versatile and accurate HF/VHF step attenuator that permits selecting any level of attenuation between 0 and 41 dB in 1 dB steps. 

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The AT1 features an unusually high upper power limit of 2 watts, making it ideal for many applications where attenuators with a lower power rating cannot be used such as at the output of a QRP transmitter for QRPp experimentation. The AT1 step attenuator is designed to be used as a standalone unit. Optionally, it may be built into existing equipment or an enclosure of your choice.

Note: This product is a kit which may involve building the product by selecting individual components, soldering them to the circuit board, winding toroids, installing LEDs and displays, calibrating circuits to meet specified performance levels. 


  • Range: 0 to 41 dB in 1 dB steps
  • Power Handling: 2 W (continuous)
  • Accuracy: Below 50 MHz: ± 0.25+0.01(A) dB 54 to 220 MHz: ± 0.50+0.01(A) dB (Where A is the attenuation in dB.)
  • Dimensions: 5-3/8” x 2-11/16” (13.7 cm x 6.8 cm)
  • No power source required 




    Q: Does Elecraft sell a factory built version of the AT1?

    A: No but we do have builders for hire.  Visit Support for our Builders Resources page for a list of Builders for Hire.

    Q: How easy is the AT1 to build?

    A:  All of our Mini-Modules kits are straightforward, one night projects. The kits are easy to assemble, featuring our "no-wires" construction. They are also a great way to get back into the swing of building and to improve your building skills.  All of our Mini-modules have no user installed surface-mount technology, so they are an ideal project for first-time builders.

    AT1 41 dB Step Attenuator Quantity Price
    AT1 AT1 41 dB Step Attenuator