The Direct Sampling SDR Architecture
The traditional radio receiver uses analog processing, i.e. analog mixers, filters and amplifiers to convert the incoming RF analog signal from the antenna to baseband, …
SSB Demodulation
The demodulation of single-sideband (SSB) signals requires special attention, because simple mixing leads to superposition of the upper and lower sidebands at audio frequencies. The …
Powerful Hardware for SDR: The Zynq and the Zedboard
This an excerpt of my more extensive paper on Xilinx’s Zynq System-on-Chip for Software Defined Radio processing from 2018: “The Xilinx Zynq: A Modern System …
Correlation for Time Delay Analysis
Time delay analysis finds the delay (also called the “lag”) between two signals, that are shifted in time. It is the most important part of …
Set Up a TDOA System
This article describes how to setup a low-cost TDOA system based on RTL-SDR + Raspberrry PI receivers and how to connect them via ethernet. Requirements …
Advantages of Digital Signal Processing for SDRs
With the advent of digital technology, analog circuits in radio transceivers have been widely replaced by digital signal processing. This is because digital signal processing …
Panoradio Reception Examples: From Long Wave to UHF
The Panoradio offers direct sampling reception from medium wave bands to the VHF region up to 100 MHz, as well as reception of the 70 …
Analog Frontend
The analog frontend of the Panoradio prepares the analog signal from the antenna for analog-to-digital conversion. This includes filtering and amplification. The Panoradio offers three …
Analog-to-Digital Converter: AD 9467
The AD converter is the heart of every direct sampling receiver. Its properties are crucial for the overall receiver performance. This is because once the …
Zoom FFT with Digital Down-Conversion
SDRs typically implement “zoomable” spectrum or waterfall displays. The signal processing behind that feature is called zoom FFT. It combines a flexible digital down converter …