Modern computers have the processing power to outperform conventional radios in receiving signals with poor S/N. Particularly when the poor S/N is due to interferences rather than to white (galactic) noise the computer can remove interference within the narrow bandwidth of the desired signal by use of the information about the interference source retrieved by use of larger bandwidths. The signal processing can be far more clever than what has been possible before. Each interference source can be treated as a signal and the DSP radio can receive AND SEPARATE a large number of signals simultaneously. The DSP radio package is under development with flexibility and generality as important aspects. This page contains links to pages that describe different aspects of digital radio processing in the order they are encountered in the ongoing development. The DSP-radio for LINUX is designed for all narrow band modulation methods for all frequency bands.

To start with the following modes will be included:

Weak signal CW (primarily EME)
Normal CW
High speed CW (meteor scatter)
SSB
FM

Fig 1. Block diagram for the Linux DSP radio in weak signal CW mode. Blue signals are in the time domain, red signals are in the frequency domain, Green signals are power vs frequency and black lines represent control parameters.

 

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My name is Leif Åsbrink. Since 1961, I have been a radio amateur, and all the time my interest has been DX on 144 MHz, and in particular equipment designed for this purpose.  SM5BSZ Home Page -Equipment for VHF DX, I try to share some of my experiences in designing and building equipment for VHF long distance communication.

 

 Leif Åsbrink SM5BSZ