Difference between revisions of "QRP Labs High Performance SDR Receiver"
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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 | *** 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 receiver requires a local oscillator (LO) input at 4x the receive frequency | *** The receiver requires a local oscillator (LO) input at 4x the receive frequency | ||
| − | |||
*** [http://qrp-labs.com/images/receiver/receiver2.pdf Receiver Build instructions] | *** [http://qrp-labs.com/images/receiver/receiver2.pdf Receiver Build instructions] | ||
** [[RF Band Pass Filters|QRP Labs Band Pass Filter]] | ** [[RF Band Pass Filters|QRP Labs Band Pass Filter]] | ||
| Line 24: | Line 23: | ||
*** [http://qrp-labs.com/images/polyphase/polyphase2a.pdf Polyphase Filter Build instructions] | *** [http://qrp-labs.com/images/polyphase/polyphase2a.pdf Polyphase Filter Build instructions] | ||
* Band Pass Filter and Polyphase filter mount on Receiver Module | * Band Pass Filter and Polyphase filter mount on Receiver Module | ||
| − | * Power supply | + | * Current draw - measured total 70 mA (5V regulator |
| + | * The receiver module is sized 80 x 37mm | ||
| + | |||
| + | === Build / Assembly === | ||
| + | |||
| + | * Power supply + 12V in | ||
| + | ** Distribute 12V using [[TinyGrid85]] card with caps | ||
** Needs 5V supply | ** Needs 5V supply | ||
| + | *** Partly populated [[TinyGrid85]] card with caps and 5V regulator (no ATTiny85 chip) | ||
** Opamps can be powered from 5V or 12-14V (for higher dynamic range) | ** Opamps can be powered from 5V or 12-14V (for higher dynamic range) | ||
| − | * The receiver | + | * [[AudioAmp386|Audio Amplifier]] |
| + | * The receiver requires a local oscillator (LO) input at 4x the receive frequency | ||
| + | ** Using [[VFO-003]] with [https://github.com/land-boards/lb-Arduino-Code/tree/master/LBCards/VFO-003_4X 4x output software option] | ||
| + | ** [https://github.com/etherkit/Si5351Arduino/tree/master/src Si5351 Driver] | ||
== Silkscreen / Pinout == | == Silkscreen / Pinout == | ||
| Line 52: | Line 61: | ||
== Polyphase Module == | == Polyphase Module == | ||
| − | [[file:QRP-Labs_Polyphase-Filter_P1966- | + | * Important to observe part outlines |
| + | ** Adjacent resistors can be put in "sideways" | ||
| + | |||
| + | [[file:QRP-Labs_Polyphase-Filter_P1966-500px.jpg]] [[file:Polyphase-pcb.PNG]] | ||
| + | |||
| + | [[file:Polyphase-pcb-2.png]] | ||
| + | |||
| + | [[file:Polyphase-Schematic.PNG]] | ||
| + | |||
| + | * USB/LSB select jumpers | ||
| + | ** Set to USB in the above picture | ||
| + | |||
| + | [[file:Polyphase_LSB-USB-Jumpers.PNG]] | ||
== Bandpass Module == | == Bandpass Module == | ||
| + | |||
| + | * 20M - 14 MHz Filter | ||
[[file:QRP-Labs_BandPass-Filter_P1963-720px.jpg]] | [[file:QRP-Labs_BandPass-Filter_P1963-720px.jpg]] | ||
[[file:Bandpass_Filter_Schematic.PNG]] | [[file:Bandpass_Filter_Schematic.PNG]] | ||
| + | |||
| + | * NanoVNA | ||
| + | ** 12-16 MHz | ||
| + | |||
| + | [[FILE:14MHz_12-16MHz_Band_Pass_Filter-2.png]] | ||
| + | |||
| + | * Data | ||
| + | |||
| + | [[FILE:14MHz_12-16MHz_Band_Pass_Filter-Data.png]] | ||
| + | |||
| + | [[FILE: 14MHz_12-16MHz_Band_Pass_Filter-Analysis.png]] | ||
== Build Issues == | == Build Issues == | ||
| Line 64: | Line 98: | ||
* Transformers don't fit well and crowd parts around them | * Transformers don't fit well and crowd parts around them | ||
* QRP Labs polyphase module pics are for older revision card | * 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 == | == Reference Documents == | ||
Revision as of 00:02, 22 November 2021
Contents
Features
- 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
- The receiver requires a local oscillator (LO) input at 4x the receive frequency
- Receiver Build instructions
- QRP Labs Band Pass Filter
- Can be used with a Switched Bandpass filter board for multiband operation
- 10/15/20/40/80M QRP Labs Band Pass Filter Kits
- Band Pass Filter Build instructions
- QRP Labs Polyphase filter
- Polyphase network plug-in module kit cancels the unwanted sideband and produces a single sideband (SSB) output
- Polyphase Filter Build instructions
- QRP Labs High Performance Receiver Module
- Band Pass Filter and Polyphase filter mount on Receiver Module
- Current draw - measured total 70 mA (5V regulator
- The receiver module is sized 80 x 37mm
Build / Assembly
- Power supply + 12V in
- Distribute 12V using TinyGrid85 card with caps
- Needs 5V supply
- Partly populated TinyGrid85 card with caps and 5V regulator (no ATTiny85 chip)
- Opamps can be powered from 5V or 12-14V (for higher dynamic range)
- Audio Amplifier
- The receiver requires a local oscillator (LO) input at 4x the receive frequency
- Using VFO-003 with 4x output software option
- Si5351 Driver
Silkscreen / Pinout
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
Polyphase Module
- Important to observe part outlines
- Adjacent resistors can be put in "sideways"
- USB/LSB select jumpers
- Set to USB in the above picture
Bandpass Module
- 20M - 14 MHz Filter
- NanoVNA
- 12-16 MHz
- Data
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
- Ultra Low Noise, High Performance, Zero IF Quadrature Product Detector and Preamplifier
- Understanding and Designing Sequence Asymmetric Polyphase Networks
- The double-tuned Circuit: An experimenter's tutorial
- 40/80m CW/SSB receiver
- Experimental Polyphase Receiver
- A Software Defined Radio for the Masses
- Very High Performance Image Rejecting Direct Conversion Receivers - NC2030 Radio
