LDA-203B Lab Brick Digital Attenuator from VAUNIX - available from bq-microwave
The VAUNIX LDA-203B is a high-resolution digital attenuator from the Lab Brick series that combines broadband attenuation control from 1 to 20 GHz with an attenuation range of 63 dB and a step size of 0.5 dB. With dual control via USB and Ethernet, programmable ramp and fading profiles, and a compact, USB-powered form factor, the LDA-203B is ideal for RF test labs, automated test equipment (ATE), and wireless standard validation.
What sets the LDA-203B apart
The LDA-203B is a bidirectional 50-Ω step attenuator with reliable and reproducible solid-state technology. The combination of precise attenuation control, fast switching time of 350 ns, and programmable ramp and fading profiles makes it a flexible tool for demanding RF measurement tasks - from manual operation using the included Windows GUI to full integration into automated test environments.
Key Specifications
- Frequency range: 1 - 20 GHz
- Attenuation range: 63 dB
- Step size: 0.5 dB
- Insertion loss: 3.5 dB typ. (< 6 GHz), 4.5 dB typ. (< 10 GHz), 8 dB typ. (< 20 GHz)
- Attenuation accuracy: 1 dB typ. at +25 °C, 3 dB typ. over full temperature range
- Switching time: 350 ns
- Max. input power: 20 dBm
- Input IP3: 50 dBm
- VSWR: 2.0:1
- Impedance: 50 Ω
- Interfaces: USB Type-C, Ethernet (RJ45)
- RF connectors: 2x SMA female
- Operating temperature: -30 °C to +70 °C
- Power supply: +5 VDC, 100 mA via USB
- Dimensions: 108.5 x 50 x 21.8 mm
- Weight: 0.182 kg
Control via USB or Ethernet
The LDA-203B offers dual control via USB and Ethernet. The USB port uses a native HID interface and requires no kernel drivers - making it immediately usable on any system that supports USB HID, including Linux and macOS as well as low-cost embedded computers. The Ethernet interface is configurable as Static IP or DHCP and provides a password-protected web interface with configurable HTTP port for additional security.
Included in the delivery are a Windows GUI with SDK, a macOS GUI with SDK, Linux SDK, LabVIEW drivers, and Python example code. This allows the LDA-203B to be operated manually as well as seamlessly integrated into existing automated test sequences - including user-created attenuation ramps and fading profiles.
Typical Applications
- WiFi, WiFi 6E, 3G, 4G, 5G, LTE - wireless standard testing with precise level control
- Microwave radio fading simulators with programmable fading profiles
- Automated Test Equipment (ATE) in production and final testing
- Engineering and development labs for multiple setups with several attenuators on one PC or USB hub
- Link simulation for path loss emulation and range measurements
Availability from bq-microwave
The VAUNIX LDA-203B as well as the other models in the Lab Brick LDA series - with frequency ranges from 6 MHz to 40 GHz and step sizes from 0.1 dB - are available from bq-microwave. We are happy to advise you on the appropriate model selection for your application and support you with integration into your test system. Contact us for quotations, delivery times, and technical datasheets.