White Papers | Publications

FlexRadio Systems White Papers 

Technical Documentation and White papers on FlexRadio's Software Defined Radios and Technology

A white paper is a definitive and detailed article or guide that clearly describes a technology, product or feature in order to provide useful information for readers seeking a better understanding of a subject. FlexRadio Systems provides a series of white papers provided by our engineering staff covering a wide range of SDR technologies and our product architectures to help you better understand the new software defined radio paradigm and how these technologies can enhance your enjoyment of ham radio.

Tracking RF Notch Filters (TNF™)

Tracking RF Notch filters are an innovation by FlexRadio Systems that revolutionized the removal of offending narrow band interference such as heterodynes, carriers and "birdies" by removing the actual RF signal from the receive passband before they have a chance to interfere and adversely effect the function of the AGC.  In addition, the placement of the tracking notch filter on the offending signal's actual RF frequency allows for the notch to "travel" with the interfering signal when changing frequencies. (download white paper)

Leveraging SDR for Digital Mode Communications.

The use of PowerSDR™ in combination with software that facilitates the digital domain transfer of audio to and from any sound card based digital mode software application has taken operating digital modes to new heights.  Combined with ultra narrow and sharp receive and transmit filters than can be defined "on the fly" FlexRadio Systems' software defined radios make operating digital mode a dream for the casual DX or ragchewer or the serious radio sport contester.  (download white paper)

Noise Performance Characteristics of Direct Conversion Receivers.

All of the FLEX family and the original SDR-1000 utilize a QSD (quadrature sampling detector) direct conversion receiver design.  A direct conversion design results in receivers that are comfortable to listen to because they avoid the cumulative nonlinear effects that plague superheterodyne designs used in many high-end ham radio receivers manufactured today.  Additionally, when a direct conversion receiver design is augmented with high performance analog to digital converters (ADCs), the result is a receiver with phenomenal noise performance characteristics.  (download white paper)

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