Variable high power ATTENUATOR (ATT) by OK2ZAW

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Attenuator is a passive device but can be very helpful for measuring tools, power aplifiers and multibeaming with more power amplifiers with different gain or input power level. There are two fan speeds including automatic speed increase by the PCB temperature. You can use ATT only during TX - controlled by PTT or in RX and TX.

Main functions:


Parameters:


Application:


Attenuator variable high power

Measured values - SMD version


ATT BYPASS 0dB

ATT 0.5dB

ATT 1dB

ATT 1.5dB

ATT 2dB

ATT 2.5dB

ATT 3dB

ATT 3.5dB

Attenuator variable high power

Measured values - OLD THT version


ATT BYPASS 0dB

ATT 0.5dB

ATT 1dB

ATT 1.5dB

ATT 2dB

ATT 2.5dB

ATT 3dB

ATT 3.5dB

ATT the best SWR

ATT worst SWR

variable attenuator THT

Example for the Multibeaming:

Attenuator variable high power Attenuator variable high power


Download

Source codes
ATT SMD ver. 2.3 (2022) schematic board
ATT older THT version sch brd
Source files eagle165
We believe open source is a better way of doing things.
View and download the Shield Schematic and PCB Kicad/Eagle CAD files,
LibreCAD .DXF, or Inkscape .SVG files.
The hardware designs are released under the
Attribution-NonCommercial 2.0 Generic

Users implementation


Really nice HS of S52AW!

Really nice HS of S52AW!

80m full size Y at S52AW