QRP Labs High Performance SDR Receiver

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
  • 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
• The receiver module is sized 80 x 37mm

Radio Links

• High performance SDR receiver module
  • Build instructions
• Polyphase network module - QRP Labs
  • Build instructions
• RF_Band_Pass_Filters
  • 10/15/20/40/80M QRP Labs Band Pass Filter Kits
• Clocks Generator

Silkscreen