Difference between revisions of "QRP Labs High Performance SDR Receiver"

Revision as of 15:56, 20 November 2021

Three modules
- QRP Labs High Performance Receiver Module
  - Direct Conversion Receiver
  - Uses a Quadrature Sampling Detector (QSD), also known as a Tayloe Detector
  - FST3253 Mixer is arranged as a double-balanced mixer for maximum performance
  - Circuit to mute receiver during transmit
  - 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 or with a polyphase filter 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
- QRP Labs Band Pass Filter
  - Can be used with a Switched Bandpass filter board for multiband operation
- QRP Labs Polyphase filter
  - Polyphase network plug-in module kit which cancels the unwanted sideband and produces a single sideband (SSB) output
Band Pass Filter and Polyphase filter mount on Receiver Module
The receiver requires a local oscillator (LO) input at 4x the receive frequency
- Using VFO-003 with 4x output option
Power supply
- Needs 5V supply
- Opamps can be powered from 5V or 12-14V (for higher dynamic range)
The receiver module is sized 80 x 37mm

@@ Line 38: / Line 38: @@
 [[file:IQ_RX_PCB.PNG]]
+=== Pins ===
 * IQ pins