NavstarGPS.US L1IFStream | USB L1 Band RF Front End

L1IFStream is an open-architecture USB Satellite Navigation RF front end (RFE) designed for software-defined receiver development, signal processing, and RF experimentation.

L1IFStream combines the Analog Devices MAX2769B receiver IC with an FTDI FT2232H high-speed bridge to stream digitized L1 IF data directly to a PC.

No firmware flashing or register configuration is required out of the box. Connect the front end to your computer and access the L1 IF data directly within your software-defined radio or DSP environment.

The L1IFStream is a dedicated USB RFE engineered for exploring and decoding L1 navigation satellite signals. Built around the industry-standard Maxim (Analog Devices) MAX2769B receiver IC and an FTDI FT2232H high-speed bridge, the board converts incoming RF into a digitized FIFO stream over USB.

With zero initial programming required, developers, researchers, and students can begin capturing real-time GPS L1 data out of the box.

Key Features

• User-Configurable MAX2769B--Select Device State 2, 6, or Serial Programmable operation through configurable resistor settings

• USB-connected GPS/GNSS L1 RF front end

• Analog Devices MAX2769B GNSS receiver

• Direct access to digitized L1 IF data

• FTDI FT2232H high-speed USB interface

• Open-source hardware architecture

• Designed for software-defined radio (SDR) development

• Compatible with custom DSP pipelines and signal-processing applications

• Suitable for GNSS-SDR, MATLAB, Python, and other development environments

• Designed, assembled, and supported in the USA

Who is L1IFStream for?

L1IFStream is designed for engineers, researchers, educators, and students working with GPS/GNSS signals, software-defined radios, RF signal processing, and GNSS receiver development.

Core Capabilities & Architecture

• Plug-and-Play Stream: In its default configuration, the board requires no registers to write or firmware to flash--plug into USB and immediately capture useful IF data.

• Direct FIFO Over USB: The onboard FTDI FT2232H high-speed bridge streams digitized IF data directly into PC software (such as GNSS-SDR, MATLAB, or custom Python pipelines).

• Flexible Antenna Input: Full hardware support for both active (with onboard bias-T / antenna power) and passive antenna setups.

• Hardware Reconfigurability: Critical hardware parameters can be customized without changing code via accessible on-board configuration jumper resistors.

Technical Specifications

Product Name L1IFStream
Driver/OS Support Standard FTDI D2XX (Windows, Linux, & macOS)
RF Front End IC Maxim/Analog Devices MAX2769B
USB Interface FTDI FT2232H (High-Speed USB FIFO)
Supported Band L1 Band (1575.42 MHz GPS / Galileo / BeiDou capable)
Data Output Continuous FIFO Digital Stream over USB
Antenna Compatibility Active and Passive antennas

Target Applications

• SDR Algorithm Prototyping: Stream raw IF samples into software-defined GNSS receiver pipelines (e.g., GNSS-SDR) to test acquisition, tracking, and demodulation algorithms

• Academic & RF Labs: A low-barrier, open hardware platform for teaching satellite navigation architectures, digital downconversion, and baseband processing

• Signal Analysis: Record and analyze real-world L1 signal propagation, multipath effects, and interference in a compact, portable form factor

Open-Source

This product (hardware and software) is licensed under CERN-OHL-S and GPLv3 for open-source, academic, and personal use. Commercial licensing is available. If you wish to integrate this receiver into a closed-source, proprietary, or commercial product without the reciprocal open-source obligations, please email contact@navstargps.us to purchase a commercial license.

For technical questions about L1IFStream, integration, or development applications, contact: contact@navstargps.us
L1IFStream is a NavStarGPS.US product from Gilbertson Precision Solutions.