fix interfaccia
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nzasch
278
note.txt
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note.txt
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######## HW ###########
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# guadagni
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3,3 / (2 * 2 * 64)
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evince Documenti/tech/docs/dsheet/boards/dm00493601-stm32g4-nucleo32-board-mb1430-stmicroelectronics.pdf
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da modificare su MB1430: SB9 and SB10 ON
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# direct sampling
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http://armradio.weaksignals.com/
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https://hackaday.io/project/171053-arm-radio-for-system-workbench
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### 2200m
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http://www.strobbe.eu/on7yd/136ant/
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http://www.strobbe.eu/on7yd/136ant/#Loops
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### 630m
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http://www.472khz.org/
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http://njdtechnologies.net/
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https://www.g0mrf.com/630m.htm P-P, con rosmetro
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http://njdtechnologies.net/wb4jwm-630-meter-non-linear-amplifier/ S-E
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# ferrite antenna
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http://www.saunalahti.fi/hohtola/ham/active-ferrite-rod-antenna/active-ferrite-rod-antenna.html
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### filtri:
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https://www.changpuak.ch/electronics/ceramic_bandpass_filter.php
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materiale #2, #3 o #8 (µ 35), #52 (µ75), #18 o #19 (55µ)
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https://cdn-reichelt.de/documents/datenblatt/B400/Amidon%23AMI.pdf # Q toroidi amidon
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https://52ebad10ee97eea25d5e-d7d40819259e7d3022d9ad53e3694148.ssl.cf3.rackcdn.com/UK_MIS_Q%20Curve%20for%20iron%20powder%20cores_TN.pdf
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http://www.w1tag.com/518%20Filter.htm 518 kHz Elliptical 50 Ohm Low-Pass Filter
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qrp-labs 630m lpf: 2.2n//2.2n + 10n + 10n + 2.2n//2.2n - 64@T50-2 (20uH) + 70@T50-2 (24uH)
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filtro IF http://sim.okawa-denshi.jp/en/OPttool.php
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100khz, gain -2
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150lhz
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### trafo:
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N49
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### oscillatore
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https://www.rfzero.net/tutorials/si5351a/
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### oscillatore locale
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https://www.ti.com/lit/szza043 - Use of the CMOS Unbuffered Inverter in Oscillator Circuits
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# encoding
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http://www.472khz.org/pages/technical-topics/weak-signal-modes.php
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# preamp
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https://www.qsl.net/ik2pii/lf/prea136.htm
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https://i.stack.imgur.com/eS0fJ.png
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https://electronics.stackexchange.com/questions/299396/i-am-looking-for-recommendations-how-to-lower-the-noise-in-this-preamplifier-cir
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http://www.u-electronique.com/annuaire/montages/cache/1777/preamplis-rf.html
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https://www.sv1afn.com/en/product-category-5/2x-j310-push-pull-low-noise-hf-pre-amplifier-500-khz-54-mhz-diy-kit-2-1.html
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https://radioaficionsdr.es.tl/Amplificadores-de-Bajo-Ruido.htm
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https://www.okdxf.eu/files/preamp_r60.pdf
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https://www.qsl.net/ko6bb/lf-preamp-1.html j310 2n3904 s-e
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3.3 poche per j310
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meglio j113
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j201 ha -1,5
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https://rezzonics.blogspot.com/2016/09/dirty-little-secret-3v3-clone-ltspice.html jfet per basse tensioni
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# audio amp
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http://techlib.com/electronics/audioamps.html
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# oscillatore test
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https://leap.tardate.com/electronics101/oscillators/colpitts/ 2n3904 5v
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# PA
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http://www.k3pgp.org/Notebook/Wd5cvg/Classetx/classetx.htm
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######## SW ###########
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https://www.eevblog.com/forum/projects/digital-clock-source-for-simple-diy-sdr-radio-with-tayloe-mixer/25/
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https://mightydevices.com/index.php/2020/02/stm32l4-discovery-radio-receiver/
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https://www.st.com/resource/en/application_note/dm00607955-guideline-for-using-analog-features-of-stm32g4-series-versus-stm32f3-series-devices-stmicroelectronics.pdf
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https://www.st.com/resource/en/application_note/dm00625282-stm32g4-adc-use-tips-and-recommendations-stmicroelectronics.pdf
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https://www.st.com/resource/en/datasheet/stm32g431kb.pdf
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# DAC DMA
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https://elastic-notes.blogspot.com/p/blog-page_1.html
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https://controllerstech.com/dac-in-stm32/
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https://www.programmersought.com/article/32934896275/
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https://electronics.stackexchange.com/questions/510050/stm32g474-signal-generation-with-dma-dac-using-stm32cubemx-hal
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make clean && make -j4 && udisksctl mount -b /dev/sda && cp build/codice.bin /media/$USER/NOD_G431KB
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# decimazione
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http://www.ws.binghamton.edu/fowler/fowler%20personal%20page/EE521_files/IV-06%20Multistage%20Schemes_2007.pdf
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https://dspguru.com/dsp/faqs/multirate/decimation/
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https://github.com/cHemingway/CM4_CIC_Filter
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http://www.radiopassioni.it/pdf/Renon2013_I2PHD.pdf
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https://www.dsprelated.com/showarticle/903.php
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# fir
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https://www.theunterminatedstring.com/cmsis-arm-fir-comparison/
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https://github.com/ARM-software/CMSIS/blob/master/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_fir_decimate_q31.c
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# iir
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https://hackernoon.com/fast-iir-filtering-on-arm-cortex-m-with-cmsis-dsp-and-gnu-octave-qk1n3y66
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# fir coeffs
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http://www.labbookpages.co.uk/audio/firWindowing.html
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https://dsp.stackexchange.com/questions/31066/how-many-taps-does-an-fir-filter-need/31077
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// 2st
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--- octave ---
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pkg load signal
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coeff = fir1(127, 0.02);
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printf ("%d, %d, %d, %d,\n",round(coeff * 2^32))
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freqz(coeff); %Plot filter response
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--------------
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https://www.dsprelated.com/showarticle/1113.php
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--- half band fir ---
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pkg load signal
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ntaps= 15;
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N= ntaps-1;
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n= -N/2:N/2;
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sinc= sin(n*pi/2)./(n*pi+eps); % truncated impulse response; eps= 2E-16
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sinc(N/2 +1)= 1/2; % value for n --> 0
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win= kaiser(ntaps,6); % window function
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b= sinc.*win';
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printf ("%d, %d, %d, %d,\n",round(b * 2^30))
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freqz(b)
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--------------
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https://dsp.stackexchange.com/questions/36190/designing-a-half-band-fir-filter-with-scilab/36847#36847
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----
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# ---
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# calcolo coeff onboard
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https://github.com/kvdijken/fir_filters
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http://www.iowahills.com/A7ExampleCodePage.html
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https://www.dsprelated.com/freebooks/sasp/FIR_Digital_Filter_Design.html
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# percorso guadagni
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adc in 14bit * 16bit nco => 30bit
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30bit/16 => 26bit
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fir => 32bit
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1450965318 236khz
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1561345318 254khz
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arm-none-eabi-objdump -d -marm build/codice.elf |less
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https://www.changpuak.ch/electronics/Deliyannis_Bandpass.php 100khz 560pf
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fig 12 in https://www.changpuak.ch/electronics/downloads/FilterDesignIn3oSeconds.pdf
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############
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LUT:
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http://amarkham.com/?p=49
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https://www.daycounter.com/Calculators/Sine-Generator-Calculator.phtml
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sin (x+h) ≈ sin x + h*cos x
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CORDIC:
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https://www.st.com/resource/en/application_note/dm00614795-getting-started-with-the-cordic-accelerator-using-stm32cubeg4-mcu-package-stmicroelectronics.pdf
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https://community.st.com/s/question/0D50X0000BJ2FP5/cordic-configuration-stm32g4
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https://brushless.zone/stm32g4-cordic-vs-sinf-for-motor-control/
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https://www.youtube.com/watch?v=SeDyNtKRDMU CORDIC in Practice, Part 2: Cosine and Sine
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https://st-onlinetraining.s3.amazonaws.com/STM32G4-Peripheral-Cordic_Coprocessor_%28CORDIC%29/index.html
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https://community.st.com/s/question/0D50X0000BJ2FP5/cordic-configuration-stm32g4
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DEMOD:
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https://github.com/df8oe/UHSDR/wiki/How-does-your-UHSDR-software-DSP-work
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https://forum.pjrc.com/attachment.php?attachmentid=9746&d=1487439697 Weaver SSB Modulation/Demodulation - A Tutorial
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http://science.lpnu.ua/sites/default/files/journal-paper/2018/sep/14625/5.pdf DIGITAL METHOD OF SSB MODULATION
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http://www.microtelecom.it/ssbdex/ssbdex-e.htm
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FIR:
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arm_fir_decimate_init_q15
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https://stackoverflow.com/questions/38264429/cmsis-fir-bandpass-filter
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DAC
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https://community.st.com/s/question/0D53W000006rVnHSAU/stm32g431kb-dac-dma-not-working
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FMAC
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https://st-onlinetraining.s3.amazonaws.com/STM32G4-Peripheral-Filter_Math_Accelerator_%28FMAC%29/index.html
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### DEV
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make clean && make && udisksctl mount -b /dev/sda && cp build/bassofono.bin /media/fra/NOD_G431KB/
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##
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precisione
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13 * 16 -> 29
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29 / 33
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# si5351
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http://www.simonsdialogs.com/2018/11/si5351a-any-frequency-cmos-clock-generator-and-vco-specifications-myths-and-truth/
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# ottimizzazione
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vuole almeno O2
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# memoria byte
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1 id
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4 freq
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2 rit
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16 nome
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2 fc
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2 fbw
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1 fbeta
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# filtro pre-adc
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TSV7722
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https://electronics.stackexchange.com/questions/20528/calculating-symbolic-input-impedance-of-multiple-feedback-low-pass-filters
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http://sim.okawa-denshi.jp/en/OPttool.php
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fc = 116660[Hz]
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R1 = 3.3kΩ
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R2 = 12kΩ
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R3 = 3.3kΩ
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C1 = 470pF
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C2 = 100pF
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fc = 138909[Hz]
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R1 = 3.9kΩ
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R2 = 15kΩ
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R3 = 3.9kΩ
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C1 = 330pF
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C2 = 68pF
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fc = 168834[Hz]
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R1 = 3.3kΩ
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R2 = 12kΩ
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R3 = 3.3kΩ
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C1 = 330pF
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C2 = 68pF
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# LC
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qrp-labs 2200m
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2.2n+10n 4.7n+22n 4.7n+22n 2.2n+10n
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105T (54uH) 105T (54uH) T50-2 (red)
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# opamp
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https://stompville.co.uk/?p=470
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http://www.ko4bb.com/getsimple/index.php?id=isolation-amplifiers
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https://www.analog.com/en/analog-dialogue/articles/avoiding-op-amp-instability-problems.html # sul mid-rail
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#
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git pull
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git add <filename>
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git add *
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git commit -m "Commit message"
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git push origin master
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git push origin --force
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# undersampling
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fc = 700
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nyq 350 700 1050
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0 - 350
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350 - 700
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700 - 1050
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centri: 175, 525, 875
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oversampling = 2
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ok 0 - 175
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med 175 - 350
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med 350 - 525
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ok 525 -
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passabasso 175 350 525
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525 700
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M24C32-RMN6P
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