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27. July 2026
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Arduino-Attamod.php 9999 Bytes 13-10-2023 09:09:09
Arduino/Genuino "Attamod"
Switchable step attenuator up to 60 dB, 1 MHz ... 2 GHz
The Prototype. Only 1 year later than thought -> NEVER put dates on a frontpanel :-)
✈ The building Blocks • Functional Description
The mastermind of this design is of course the Arduino Nano Every. It handles the user input from the keyboard as well as the serial commands and displays the attenuation on the 128 x 32 pixel oled display. The Nano also programs the chain of attenuators.
View inside the case. Not much there ...
✈ Downloads
✈ The Workhorse : F1958NBGK from Renesas
The board was designed to fit in an existing case (style 3), milled from Aluminium. It houses 3 F1958NBGK from Renesas (7-Bit 0.25dB Digital Step Attenuator, 1MHz to 6GHz). In order to reduce stray coupling, shields can be installed between the attenuators. With the three attenuators, a theoretical attenuation of 3 x 31.75 dB = 95.25 dB deems possible, but the truth is that the software limits it to 50 dB, as the Amplitude response becomes ugly.
✈ Remote Control of the Attamod
COM SETTINGS :
Set up the COM port inside the PC according to the following list.
• Baud rate: 115200
• Parity bit: None
• Data bit: 8
• Stop bit: 1
• Data flow control: None
Set up the COM port inside the PC according to the following list.
• Baud rate: 115200
• Parity bit: None
• Data bit: 8
• Stop bit: 1
• Data flow control: None
COMMAND SYNTAX :
*IDN?
Description： Returns the Device's identification.
Example *IDN?
Returns ATTAMOD 3.0 BY CHANGPUAK.CH
Returns 13.10.2023
Att?
Description： Returns the current attenuation setting
Example Att?
Returns 29.0
Att:xxxxx
Description： Sets the Attenuation
Example Att:9.0
Returns NIL (nothing)
*IDN?
Description： Returns the Device's identification.
Example *IDN?
Returns ATTAMOD 3.0 BY CHANGPUAK.CH
Returns 13.10.2023
Att?
Description： Returns the current attenuation setting
Example Att?
Returns 29.0
Att:xxxxx
Description： Sets the Attenuation
Example Att:9.0
Returns NIL (nothing)
✈ Performance
Measurements have been done with a hp8753. Most manufacturers calibrate in position 0 dB - which of course gives more beautiful results, but we wanted to characterize the device, not only the attenuators.
✈ Share your thoughts
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t1 = 7319 d
t2 = 241 ms |
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