Difference between pages "Kits and Parts Lowpass Filter" and "QRP Labs High Performance SDR Receiver"

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== Kits and Parts Universal Filter Board ==
+
[[file:QRP-Labs_P1956-720px.jpg]]
  
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* [https://kitsandparts.com/lpf.1.5.php 7-pole Universal Low Pass Filter for HF] - Kits and Parts webpage
+
== Features ==
−
** $4 PCB
 
−
** Handles toroid inductor sizes up to T80
 
−
*** 125W power
 
−
** 0.2" lead spacing for caps
 
−
** (4) 4-40 mounting holes
 
  
−
=== CWAZ filter ===
+
* 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
  
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* [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN]
+
=== Build / Assembly ===
−
** Much better performance than standard 3C/3L filter at 2nd harmonic
 
−
** Only needs one additional capacitor across center inductor
 
−
** Other L/C values are a bit different to compensate
 
  
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=== Other References and Topologies ===
+
* 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]
  
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* [https://kitsandparts.com/PCBs/LPF/filter0.pdf Introduction to LPFs by Paul Hardin, NA5N]
+
== Silkscreen / Pinout ==
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* [https://kitsandparts.com/PCBs/LPF/filter2.pdf 7 Element Chebyshev standard value capacitor LPFs]
 
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* [https://rf-tools.com/lc-filter/ LC Filter Design Tool]
 
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* [https://www.66pacific.com/calculators/toroid-coil-winding-calculator.aspx Toroid Coil Winding Calculator]
 
  
−
=== K&P Schematic ===
+
[[file:IQ_RX_PCB.PNG]]
  
−
[[file:LPF.1.5.sch.png]]
+
=== Pins ===
  
−
=== K&P PCB ===
+
* 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
  
−
[[file:LPF.1.5.pcb.png]]
+
== Receiver Module ==
  
−
== CWAZ 40M, 7 MHz Filter ==
+
[[file:QRP-Labs_Receiver-Base_P1969-720px.jpg]]
  
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* Based on [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN] - Built this one
+
== Polyphase Module ==
  
−
=== SPICE Simulation ===
+
*  Important to observe part outlines
 +
** Adjacent resistors can be put in "sideways"
  
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* [https://github.com/land-boards/lb-boards/tree/master/HamRadio/BUTTER07/DOCS/Spice_Sims GitHub repo]
+
[[file:QRP-Labs_Polyphase-Filter_P1966-500px.jpg]] [[file:Polyphase-pcb.PNG]]
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* -6 dB at 7 MHz
 
−
* -68 dB at 1st harmonic (14 MHz)
 
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* -75 dB at 2nd harmonic (21 MHz)
 
  
−
[[file:CWAZ_LowPass7MHz_SPICE.png]]
+
[[file:Polyphase-pcb-2.png]]
  
−
[[file:CWAZ_LowPass_Values.PNG]]
+
[[file:Polyphase-Schematic.PNG]]
  
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=== T37-2 Inductors ===
+
* USB/LSB select jumpers
 +
** Set to USB in the above picture
  
−
* [http://toroids.info/T37-2.php T37-2 Toroid Specs and turns calculator]
+
[[file:Polyphase_LSB-USB-Jumpers.PNG]]
  
−
==== INDUCTANCE - L1, L3 ====
+
== Bandpass Module ==
  
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* Desired:  1.34 uH
+
* 20M - 14 MHz Filter
−
* Calculated: 1.3 uH (97% of desired) Turns required: 18
 
−
* CORE
 
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* Part number: T-37-2 (Red)
 
−
* Frequency Range: 1 to 30 MHz
 
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* u: 10
 
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* AL: 40 uH/100 turns
 
  
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==== INDUCTANCE - L2 ====
+
[[file:QRP-Labs_BandPass-Filter_P1963-720px.jpg]]
  
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* Desired: 1.22 uH
+
[[file:Bandpass_Filter_Schematic.PNG]]
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* Calculated: 1.2 uH (95% of desired) Turns required: 17
 
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* CORE
 
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* Part number: T-37-2 (Red)
 
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* Frequency Range: 1 to 30 MHz
 
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* u: 10
 
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* AL: 40 uH/100 turns
 
  
−
=== Measured on NanoVNA ===
+
* NanoVNA
 +
** 12-16 MHz
  
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* 7 MHz LP filter
+
[[FILE:14MHz_12-16MHz_Band_Pass_Filter-2.png]]
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* Built with junk box low voltage ceramic disc caps
 
  
−
[[file:LowPass7MHz_NanoVNA.png]]
+
* Data
  
−
== Rebuild - Higher Power ==
+
[[FILE:14MHz_12-16MHz_Band_Pass_Filter-Data.png]]
  
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* T80-2 Inductors
+
[[FILE: 14MHz_12-16MHz_Band_Pass_Filter-Analysis.png]]
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** Larger gauge wire
 
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** Integer turns values
 
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** [http://toroids.info/T80-2.php T80-2 Toroid Specs and turns calculator]
 
  
−
[[file:Toroid_1.24uH_15T.PNG]]
+
== Build Issues ==
  
−
[[file:Toroid_1.41uH_16T.PNG]]
+
* 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
  
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=== Simulation ===
+
== Reference Documents ==
  
−
[[file:CWAZ_LowPass7MHz_SPICE_IntegerTurnsInd.png]]
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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]
−
 
+
* [http://antennoloog.nl/data/documents/Understanding_and_designing_Polyphase_networks_V4.0.pdf Understanding and Designing Sequence Asymmetric Polyphase Networks]
−
=== Measured with NanoVNA ===
+
* [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]
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* Excellent performance!!!
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* [http://hanssummers.com/images/stories/polyphase/polyphase.pdf Experimental Polyphase Receiver]
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* 7 MHz
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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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** S21 = -1.55 dB
+
* [http://norcalqrp.org/files/AustinNC2030Presentation.pdf Very High Performance Image Rejecting Direct Conversion Receivers] - NC2030 Radio
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** VSWR = 1.008
 
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* 14 MHz - 1st harmonic
 
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** S21 = -55.8 dB
 
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** VSWR = 5.181
 
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* 21 MHz - 2nd harmonic
 
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** S21 = -69 dB
 
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** VSWR = 15.225
 
−
 
 
−
[[file:CWAZ_7MHZ_NANOVNA_125W_PLOTS.PNG]]
 
−
 
 
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[[file:CWAZ_7MHZ_NANOVNA_125W_DATA.PNG]]
 
−
 
 
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== CWAZ - 20M, 14MHz LP Filter ==
 
−
 
 
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* SPICE Simulation
 
−
 
 
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[[file:CWAZ-20M-SPICE.PNG]]
 
−
 
 
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* Toroid T80-2
 
−
 
 
−
[[file:ind-680nH.PNG]]
 
−
 
 
−
[[file:ind-608nH.PNG]]
 
−
 
 
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* T80-2 has Optimum Resonant Circuit Range for highest Q and lowest core loss
 
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** 250 KHz - 10 MHz
 
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* T80-6 has better characteristics
 
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** Optimum Resonant Circuit Range for highest Q and lowest core loss
 
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** 3 MHz - 40 MHz
 
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* Don't have any T80-6 but I do have T37-6
 
−
 
 
−
[[file:T37-6_Ind-608nH.PNG]]
 
−
 
 
−
[[file:T37-6_Ind-680nH.PNG]]
 
−
 
 
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=== NanoVNA caps ===
 
−
 
 
−
[[file:CWAZ-20M-NanoVNA-data.PNG]]
 
−
 
 
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[[file:CWAZ-20M-NanoVNA-plot.PNG]]
 
−
 
 
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== Ceramic Disc Caps ==
 
−
 
 
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* High voltage quality caps
 
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** Ceramic - should these be silver mica caps?
 
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** Ceramic caps are 10x cheaper than silver mica caps
 
−
*** 100pF, Silver Mica cap, P/N: [https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/CDV16FF101JO3F?qs=tNDx7qEChkcFgJ1eZKwb4g%3D%3D CDV16FF101JO3F], $1.40 (per, qty 10)
 
−
*** 100pF, Ceramic cap, P/N: CC45SL3AD101JYNNA, $0.14 (per, qty 10)
 
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** Will the ceramic caps cause [https://e2e.ti.com/blogs_/archives/b/precisionhub/posts/stress-induced-outbursts-microphonics-in-ceramic-capacitors-part-1 Microphonics] or is that only an issue in gain stages?
 
−
*** SL caps are single layer
 
−
 
 
−
{| class="wikitable"
 
−
! Capacitance (pF)
 
−
! Mfr. #
 
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! Manufacturer
 
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! Description
 
−
|-
 
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| 10
 
−
| S100K33SL0R63K7R
 
−
| Vishay
 
−
| Ceramic Disc Capacitors 10pF 3000V 10% SL0 7.5mm LS
 
−
|-
 
−
| 33
 
−
| CC45SL3AD330JYNNA
 
−
| TDK
 
−
| Ceramic Disc Capacitors D: 5.5mm 1kV 33pF SL 5% LS:5mm
 
−
|-
 
−
| 47
 
−
| CC45SL3AD470JYVNA
 
−
| TDK
 
−
| Ceramic Disc Capacitors D: 5.5mm 1kV 47pF SL 5% LS:5mm
 
−
|-
 
−
| 82
 
−
| CC45SL3AD820JYNNA
 
−
| TDK
 
−
| Ceramic Disc Capacitors D: 6mm 1kV 82pF SL 5% LS:5mm
 
−
|-
 
−
| 100
 
−
| CC45SL3AD101JYNNA
 
−
| TDK
 
−
| Ceramic Disc Capacitors D: 6.5mm 1kV 100pF SL 5% LS:5mm
 
−
|-
 
−
| 120
 
−
| CC45SL3AD121JYNNA
 
−
| TDK
 
−
| Ceramic Disc Capacitors D: 7mm 1kV 120pF SL 5% LS:5mm
 
−
|-
 
−
| 200
 
−
| S201K33S3NN63L6R
 
−
| Vishay
 
−
| Ceramic Disc Capacitors 200PF 1KV 10%
 
−
|-
 
−
| 270
 
−
| CC45SL3AD271JYVNA
 
−
| TDK
 
−
| Ceramic Disc Capacitors D: 9mm 1kV 270pF SL 5% LS:5mm
 
−
|-
 
−
| 330
 
−
| S331K33Y5PR63K7R
 
−
| Vishay
 
−
| Ceramic Disc Capacitors 330pF 3000V 10% Y5P 7.5mm LS
 
−
|-
 
−
| 390
 
−
| CC45SL3AD391JYVNA
 
−
| TDK
 
−
| Ceramic Disc Capacitors D: 10.5mm 1kV 390pF SL 5% LS:5mm
 
−
|-
 
−
| 470
 
−
| D471K20Y5PH6UJ5R
 
−
| Vishay
 
−
| Ceramic Disc Capacitors 470pF 100V 10%
 
−
|-
 
−
| 680
 
−
| S681K29Y5PN63J5R
 
−
| Vishay
 
−
| Ceramic Disc Capacitors 680pF 1000V 10% Y5P 5.0mm LS
 
−
|-
 
−
|}
 

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

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