Difference between pages "File:RF-AMP-LTSPICE XFMRS.PNG" and "QRP Labs High Performance SDR Receiver"

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[[file:QRP-Labs_P1956-720px.jpg]]
  
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== Features ==
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* Three modules
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** [http://qrp-labs.com/receiver QRP Labs High Performance Receiver Module]
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*** Direct Conversion Receiver
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*** Uses a Quadrature Sampling Detector (QSD), also known as a Tayloe Detector
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*** [https://www.onsemi.com/pdf/datasheet/fst3253-d.pdf FST3253] Mixer is arranged as a double-balanced mixer for maximum performance
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*** Circuit to mute receiver during transmit
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*** [https://www.ti.com/lit/ds/symlink/lm4562.pdf Low noise LM4562 op-amps] are used in instrumentation amplifier configuration to provide excellent common mode noise rejection
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*** 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
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*** The module is designed to directly drive a stereo input sound-card or with a polyphase filter card
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*** 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
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*** The receiver requires a local oscillator (LO) input at 4x the receive frequency
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*** [http://qrp-labs.com/images/receiver/receiver2.pdf Receiver Build instructions]
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** [[RF Band Pass Filters|QRP Labs Band Pass Filter]]
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*** Can be used with a [https://qrp-labs.com/ultimatelpf.html Switched Bandpass filter board] for multiband operation
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*** [http://qrp-labs.com/bpfkit.html 10/15/20/40/80M QRP Labs Band Pass Filter Kits]
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*** [https://qrp-labs.com/images/bpfkit/bpf2.pdf Band Pass Filter Build instructions]
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** [https://qrp-labs.com/polyphase QRP Labs Polyphase filter]
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*** Polyphase network plug-in module kit cancels the unwanted sideband and produces a single sideband (SSB) output
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*** [http://qrp-labs.com/images/polyphase/polyphase2a.pdf Polyphase Filter Build instructions]
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* Band Pass Filter and Polyphase filter mount on Receiver Module
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* Current draw - measured total 70 mA (5V regulator
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* The receiver module is sized 80 x 37mm
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=== Build / Assembly ===
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* Power supply + 12V in
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** Distribute 12V using [[TinyGrid85]] card with caps
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** Needs 5V supply
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*** Partly populated [[TinyGrid85]] card with caps and 5V regulator (no ATTiny85 chip)
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** Opamps can be powered from 5V or 12-14V (for higher dynamic range)
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* [[AudioAmp386|Audio Amplifier]]
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* The receiver requires a local oscillator (LO) input at 4x the receive frequency
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** Using [[VFO-003]] with [https://github.com/land-boards/lb-Arduino-Code/tree/master/LBCards/VFO-003_4X 4x output software option]
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** [https://github.com/etherkit/Si5351Arduino/tree/master/src Si5351 Driver]
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== Silkscreen / Pinout ==
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[[file:IQ_RX_PCB.PNG]]
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=== Pins ===
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* IQ pins
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* I, GND, Q outputs
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* Power pins
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* GND, +5V, +5V or +12V to +14V
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* Tx Mute Input
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** 5V mutes inputs
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* LO input
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** 3.3V from Si5351A oscillators
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* IF input
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** From external Bandpass Filter Switch
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== Receiver Module ==
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[[file:QRP-Labs_Receiver-Base_P1969-720px.jpg]]
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== Polyphase Module ==
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*  Important to observe part outlines
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** Adjacent resistors can be put in "sideways"
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[[file:QRP-Labs_Polyphase-Filter_P1966-500px.jpg]] [[file:Polyphase-pcb.PNG]]
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[[file:Polyphase-pcb-2.png]]
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[[file:Polyphase-Schematic.PNG]]
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* USB/LSB select jumpers
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** Set to USB in the above picture
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[[file:Polyphase_LSB-USB-Jumpers.PNG]]
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== Bandpass Module ==
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* 20M - 14 MHz Filter
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[[file:QRP-Labs_BandPass-Filter_P1963-720px.jpg]]
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[[file:Bandpass_Filter_Schematic.PNG]]
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* NanoVNA
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** 12-16 MHz
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[[FILE:14MHz_12-16MHz_Band_Pass_Filter-2.png]]
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* Data
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[[FILE:14MHz_12-16MHz_Band_Pass_Filter-Data.png]]
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[[FILE:  14MHz_12-16MHz_Band_Pass_Filter-Analysis.png]]
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== Build Issues ==
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* Transformers don't fit well and crowd parts around them
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* QRP Labs polyphase module pics are for older revision card
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* One of the two variable caps on the Bandpass filter was very hard to turn even after the first turn
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== Reference Documents ==
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* [https://wparc.us/presentations/SDR-2-19-2013/Tayloe_mixer_x3a.pdf Ultra Low Noise, High Performance, Zero IF Quadrature Product Detector and Preamplifier]
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* [http://antennoloog.nl/data/documents/Understanding_and_designing_Polyphase_networks_V4.0.pdf Understanding and Designing Sequence Asymmetric Polyphase Networks]
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* [https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1991/12/page29/ The double-tuned Circuit: An experimenter's tutorial]
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* [http://hanssummers.com/polyphase 40/80m CW/SSB receiver]
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* [http://hanssummers.com/images/stories/polyphase/polyphase.pdf Experimental Polyphase Receiver]
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* [http://www.arrl.org/files/file/Technology/tis/info/pdf/030304qex020.pdf A Software Defined Radio for the Masses]
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* [http://norcalqrp.org/files/AustinNC2030Presentation.pdf Very High Performance Image Rejecting Direct Conversion Receivers] - NC2030 Radio

Revision as of 00:02, 22 November 2021

QRP-Labs P1956-720px.jpg

Features

Build / Assembly

Silkscreen / Pinout

IQ RX PCB.PNG

Pins

  • IQ pins
  • I, GND, Q outputs
  • Power pins
  • GND, +5V, +5V or +12V to +14V
  • Tx Mute Input
    • 5V mutes inputs
  • LO input
    • 3.3V from Si5351A oscillators
  • IF input
    • From external Bandpass Filter Switch

Receiver Module

QRP-Labs Receiver-Base P1969-720px.jpg

Polyphase Module

  • Important to observe part outlines
    • Adjacent resistors can be put in "sideways"

QRP-Labs Polyphase-Filter P1966-500px.jpg Polyphase-pcb.PNG

Polyphase-pcb-2.png

Polyphase-Schematic.PNG

  • USB/LSB select jumpers
    • Set to USB in the above picture

Polyphase LSB-USB-Jumpers.PNG

Bandpass Module

  • 20M - 14 MHz Filter

QRP-Labs BandPass-Filter P1963-720px.jpg

Bandpass Filter Schematic.PNG

  • NanoVNA
    • 12-16 MHz

14MHz 12-16MHz Band Pass Filter-2.png

  • Data

14MHz 12-16MHz Band Pass Filter-Data.png

14MHz 12-16MHz Band Pass Filter-Analysis.png

Build Issues

  • Transformers don't fit well and crowd parts around them
  • QRP Labs polyphase module pics are for older revision card
  • One of the two variable caps on the Bandpass filter was very hard to turn even after the first turn

Reference Documents

File history

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