OpenHPSDR

The HPSDR (High Performance Software Defined Radio) project dates from 2005 when Phil Covington, Phil Harman, and Bill Tracey combined their separate projects to form the HPSDR group. The project uses a 16-bit 135MSPS analog-to-digital converter that provides performance over the range 0 to 55 MHz comparable to that of a conventional analogue HF radio. The receiver will also operate in the VHF and UHF range using either mixer image or alias responses. Interface to a PC is provided by a USB 2.0 interface. The project is modular and comprises a backplane onto which other boards plug in. This allows experimentation with new techniques and devices without the need to replace the entire set of boards. An exciter provides 1/2W of RF over the same range or into the VHF and UHF range using image or alias outputs. The HPSDR project is open-source for both hardware and software. A Wiki provides frequent updates as to project progress.

The HPSDR hardware uses a high speed analogue to digital converter for direct conversion of the received or transmitted signal. The signal information (now in digital format) is processed by a computer to recover the desired information (voice, morse code, teletype, etc.).

See also

• Universal Software Radio Peripheral
• Software-defined radio
• Digital radio
• PACTOR
• AMTOR