Difference between pages "Octopus Tester" and "QRP Labs High Performance SDR Receiver"
(Difference between pages)
Jump to navigation
Jump to search
Blwikiadmin (talk | contribs) |
Blwikiadmin (talk | contribs) |
||
| Line 1: | Line 1: | ||
| − | [[file: | + | [[file:QRP-Labs_P1956-720px.jpg]] |
| − | + | == Features == | |
| − | == | + | * Three modules |
| + | ** [http://qrp-labs.com/receiver QRP Labs High Performance Receiver Module] | ||
| + | *** Direct Conversion Receiver | ||
| + | *** Uses a Quadrature Sampling Detector (QSD), also known as a Tayloe Detector | ||
| + | *** [https://www.onsemi.com/pdf/datasheet/fst3253-d.pdf FST3253] Mixer is arranged as a double-balanced mixer for maximum performance | ||
| + | *** Circuit to mute receiver during transmit | ||
| + | *** [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 | ||
| + | *** 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 | ||
| + | *** [http://qrp-labs.com/images/receiver/receiver2.pdf Receiver Build instructions] | ||
| + | ** [[RF Band Pass Filters|QRP Labs Band Pass Filter]] | ||
| + | *** Can be used with a [https://qrp-labs.com/ultimatelpf.html Switched Bandpass filter board] for multiband operation | ||
| + | *** [http://qrp-labs.com/bpfkit.html 10/15/20/40/80M QRP Labs Band Pass Filter Kits] | ||
| + | *** [https://qrp-labs.com/images/bpfkit/bpf2.pdf Band Pass Filter Build instructions] | ||
| + | ** [https://qrp-labs.com/polyphase QRP Labs Polyphase filter] | ||
| + | *** Polyphase network plug-in module kit cancels the unwanted sideband and produces a single sideband (SSB) output | ||
| + | *** [http://qrp-labs.com/images/polyphase/polyphase2a.pdf Polyphase Filter Build instructions] | ||
| + | * 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) |
| − | * | + | * [[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 == |
| − | [[file: | + | [[file: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 == | |
| − | + | [[file:QRP-Labs_Receiver-Base_P1969-720px.jpg]] | |
| − | + | == Polyphase Module == | |
| − | |||
| − | |||
| − | |||
| − | + | * 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: | + | [[file:Polyphase-pcb-2.png]] |
| − | + | [[file:Polyphase-Schematic.PNG]] | |
| − | * | + | * USB/LSB select jumpers |
| − | * | + | ** Set to USB in the above picture |
| − | [[file: | + | [[file:Polyphase_LSB-USB-Jumpers.PNG]] |
| − | + | == Bandpass Module == | |
| − | + | * 20M - 14 MHz Filter | |
| − | + | [[file:QRP-Labs_BandPass-Filter_P1963-720px.jpg]] | |
| − | [[file: | + | [[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 == | |
| − | + | * 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 == | |
| − | + | * [https://wparc.us/presentations/SDR-2-19-2013/Tayloe_mixer_x3a.pdf Ultra Low Noise, High Performance, Zero IF Quadrature Product Detector and Preamplifier] | |
| + | * [http://antennoloog.nl/data/documents/Understanding_and_designing_Polyphase_networks_V4.0.pdf Understanding and Designing Sequence Asymmetric Polyphase Networks] | ||
| + | * [https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1991/12/page29/ The double-tuned Circuit: An experimenter's tutorial] | ||
| + | * [http://hanssummers.com/polyphase 40/80m CW/SSB receiver] | ||
| + | * [http://hanssummers.com/images/stories/polyphase/polyphase.pdf Experimental Polyphase Receiver] | ||
| + | * [http://www.arrl.org/files/file/Technology/tis/info/pdf/030304qex020.pdf A Software Defined Radio for the Masses] | ||
| + | * [http://norcalqrp.org/files/AustinNC2030Presentation.pdf Very High Performance Image Rejecting Direct Conversion Receivers] - NC2030 Radio | ||
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
