Comments on: DC-4.0GHz RF Fixed Attenuator https://www.epanorama.net/blog/2017/08/05/dc-4-0ghz-rf-fixed-attenuator/ All about electronics and circuit design Wed, 22 Apr 2026 22:06:23 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/05/dc-4-0ghz-rf-fixed-attenuator/comment-page-1/#comment-1764833 Fri, 15 Apr 2022 20:26:01 +0000 http://www.epanorama.net/newepa/?p=57952#comment-1764833 https://www.electronics-tutorials.ws/attenuators/t-pad-attenuator.html

http://www.nu9n.com/tpad-calculator.html

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/05/dc-4-0ghz-rf-fixed-attenuator/comment-page-1/#comment-1741324 Mon, 22 Nov 2021 13:47:33 +0000 http://www.epanorama.net/newepa/?p=57952#comment-1741324 6G Digital Programmable Attenuator 30DB Step 0.25DB OLED Display CNC Shell RF Module
https://www.banggood.com/6G-Digital-Programmable-Attenuator-30DB-Step-0_25DB-OLED-Display-CNC-Shell-RF-Module-p-1648810.html?currency=EUR&utm_source=criteo&utm_medium=cpc_brand&utm_content=all&utm_campaign=electronics-emea-en&cur_warehouse=CN

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/05/dc-4-0ghz-rf-fixed-attenuator/comment-page-1/#comment-1641644 Thu, 06 Jun 2019 14:23:53 +0000 http://www.epanorama.net/newepa/?p=57952#comment-1641644 A DIY Step Attenuator, By Gluing Together Two Smaller Ones
https://hackaday.com/2019/06/04/a-diy-step-attenuator-by-gluing-together-two-smaller-ones/

In the RF world, attenuators are a useful test and measurement tool. Variable units that can apply different levels of attenuation in discrete steps are even better. [DuWayne] made a 63 dB step attenuator by putting two smaller units in series, with an Arduino Nano in control of them. With a 3D printed enclosure and OLED for feedback, the device is easily adjusted with a single rotary encoder.

63 dB step attenuator UPDATE 5/9/19
https://kv4qb.blogspot.com/2019/04/63-db-step-attenuator.html

I have several digital controlled attenuator modules that I bought one eBay a while ago, and I guess it is time to use some of them.

simplest with only 6 control pins for a total attenuation of 31.5 dB in .5 dB steps. I am going to connect two in series with the control lines paralleled for a total of 63 dB in 1 dB steps.

a 9 volt battery for power. The attenuator module runs on 3.3 volts, but the current draw is low enough that I can power it directly from the 3.3 volt output of the Nano.

It is very simple, with just checking the rotary encoder and incrementing or decrementing the attenuation value by the step size which can be changed by pressing the encoder button.

Also measured insertion loss with it set to 0 dB, and found about a 3 dB loss at all frequencies I am interested in.

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