Practical implementation of a HF digital receiver and digital transmitter drive

The replacement of conventional analogue HF communications receivers by digitally implemented equipment is becoming increasingly common. These offer advantages of improved performance, increased flexibility and lower cost. The Marconi H2550 MF/HF receiver is such an equipment. Employing a novel bandpass sigma-delta analog-to-digital converter (ADC), custom ICs and digital signal processing (DSP), the H2550 represents state-of-the-art equipment for land and naval use. The Marconi H1550 HF transmitter drive employs similar techniques to provide these benefits over conventional analogue drives. This paper discusses some of the practical aspects of their implementation