SKU: 75998077446

4 Channel 128 dB Programmable Attenuator (USB-C), 0.25 dB Step, 9K-8GHz

$2477.70 $2753.00
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Sep 24 - Sep 29

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Description

4 Channel 128 dB Programmable Attenuator (USB-C), 0.25 dB Step, 9K-8GHzPart Number: A4Q9K8G128 is a general purpose, four channel programmable attenuator suitable for wide range of signal level control applications from 9K to 8 GHz. The Attenuator provides 0 to 127 dB attenuation in 0. 25 dB steps. The Attenuator is housed in an ultra compact and rugged enclosure with four SMA Female connectors. The attenuator can be controlled via USB. Full software supported with our user friendly GUI application for Windows and Linux.

Part Number: A4Q9K8G128 is a general purpose, four channel programmable attenuator suitable for wide range of signal level control applications from 9K to 8 GHz.  The Attenuator provides 0 to 127 dB attenuation in 0.25 dB steps.

The Attenuator is housed in an ultra-compact and rugged enclosure with four SMA Female connectors.  The attenuator can be controlled via USB. Full software supported with our user-friendly GUI application for Windows and Linux.

It uses USB Type C connector for power and control.

Proudly Made in USA by Lotus Communication Systems, INC. in Massachusetts (www.lotussys.com).

Features

  • Four Channels
  • Frequency Range: 9K to 8G Hz
  • Wide Attenuation Range: 127 dB
  • Fine Attenuation Resolution: 0.25 dB
  • Short Attenuation Transition Time (500 ns)
  • Stainless Steel SMA Female Connector
  • High Quality Rogers RO4350 RF PCB
  • Electroless Nickel Plating and Permanent Laser Marking
  • USB Control
  • ROHS Compliant

Applications

  • Test Instrumentation
  • Automated Test Equipment
  • General Purpose Wireless
  • VSAT
  • SDR & Ham Radio

Resources (Datasheet)

A4Q9K8G128 Datasheet


Operational Manual

Digital Step Attenuator User Manual


    Windows/Linux GUI Control SW

    Self-Executable GUI SW Download

       

      Shipping Notes
      • Free Standard Shipping on $100+ Orders to the USA.
      • Except Preorder products are shipped in 48 hours.
      • Delivery to the USA:
      1. Standard Shipping : 3-10 business days
      • If time is of the essence, please consider selecting expedited delivery for faster service.
      Exchange/Return Notes
      • We offer a 30-day return/exchange service after receiving.
      • Final sale items are not eligible for returns or exchanges.
      • To process your return/exchange, please contact us at [email protected]
      • Please click here for more details>>> Return & Exchange Policy
      SKU: 75998077446

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      4.8 ★★★★★
      Based on 14 reviews
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      D
      Verified Purchase
      DonnyDJM.
      Chelsea, US
      ★★★★★ 5
      Works great-easy-breezy!
      Style: 20V Pwr Drv Trimmer (LST522-CA)
      Wifey loves this!
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on April 26, 2026
      T
      Verified Purchase
      T H Birch
      West Palm Beach, US
      ★★★★★ 4
      Weeds
      Style: 20V Pwr Drv Trimmer (LST522-CA)
      Great
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on May 16, 2026
      E
      Verified Purchase
      Emc
      West Palm Beach, US
      ★★★★★ 5
      Very good trimmer
      Style: 20V Pwr Drv Trimmer (LST522-CA)
      This is my third black and decker trimmer over 10 years. This new one has a few more features. Great trimmer. The only thing I don’t like is the spool advance spring which if not careful can fall out and get lost when installing a new spool.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on December 3, 2025
      M
      Verified Purchase
      Mark Terranova
      Charlottesville, US
      ★★★★★ 5
      Works great
      Style: 20V Pwr Drv Trimmer (LST522-CA)
      Works great
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on December 4, 2025
      M
      Verified Purchase
      Mike_L
      Draper, US
      ★★★★★ 3
      Seems to be refurbished but works as expected
      Style: 20V Pwr Drv Trimmer (LST522-CA)
      The packaging and the fact that it only included one battery is a pretty good indication that I was sent a refurbished product. I purchased it as NEW. The user manual was pretty clear, however, as the print was small. It would have been nice to have available a download version. (I searched the Black & Decker website but couldn’t find one.) I use the tool to edge the lawn and trim around trees and garden. While not as powerful on high setting as my old corded model, it was adequate for normal lawn and yard. I would recommend having 2 batteries as it started to run down towards end of my work. I used it on high settings most of the time. I did have trouble getting the grass growing from cracks but got it close enough. Patches of high weeds took work to get them cut down. I think if I worked at getting the angle ‘better’, I could have done better, however, as this was my first use and I wanted to be sure I had enough battery. Although I am disappointed it seems refurbished and comes with only one battery, it seems to do what I need and I will be keeping it.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on April 22, 2026

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