The description of low-noise, high-dynamic-range digital receiver/spectrometer for radio astronomy applications has been added.

Two-channel digital receiver which is used for observing both stationary and sporadic radio sources in the decameter wave band. The ADC module is manufactured as a separate block in order to avoid interferences from the DSP board and the PC electric circuits. Due to this and other solutions, both a high SFDR value and a low level of the noise floor have been achieved.

ADC module	DSP board

Receiver characteristics are listed below:

• Sampling frequency is of 66 MHz.
• Regimes: waveform capture, spectrogram analysis, coherence analysis (cross covariance between the two inputs).
• The ADC module is manufactured as a separate block to avoid interferences from the DSP board and the PC.
• Connection via a 2x2.5Gbit/sec serial data link.
• PCI-X64/66 standard interface for the communication with the PC.
• High SFDR value (115dBc) and a low noise floor (-120dBFS)
• Real-time RFI mitigation option.
• Client-Server architecture of the interactive software controls the receiver (modes of operation, processing parameters) remotely via Internet in real time.