QRP Labs High Performance SDR Receiver

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Rx bpf poly.jpg

Features

  • Three modules mount together
    • Radio Module
      • High performance receiver module uses a Quadrature Sampling Detector (QSD), also known as a Tayloe Detector
      • Mixer is arranged as a double-balanced mixer for maximum performance
      • There is a transmit/receive switch onboard. Low noise LM4562 op-amps are used in instrumentation amplifier configuration to provide excellent common mode noise rejection
      • The audio output of the module is isolated using two 600:600-ohm transformers to reduce or eliminate the ground loop problems which can easily occur in SDR systems
      • The module is designed to directly drive a stereo input sound-card
      • Receiver board has a socket for the standard QRP Labs Band Pass Filter kit which can be routed to an external bandpass filter switch card
      • The module is sized 80 x 37mm
    • Band Pass Filter
      • Can be used with a switched Bandpass filter board for multiband operation
    • Polyphase filter
      • Polyphase network plug-in module kit which cancels the unwanted sideband and produces a single sideband (SSB) output
  • The receiver requires a local oscillator (LO) input at 4x the receive frequency

Radio Links

Silkscreen

IQ RX PCB.PNG