Edge Collective

Radio Experiments

Notes on experiments with RNode / Signal / APRS

2021-02-18 16:44:38

https://github.com/AsamK/signal-cli/wiki
signal-cli -u +18572850070 send -m "hallo from the cli again!" +17817756406
signal-cli -u +18572850070 receive

atmega1284

Using the ATmega1284 with the Arduino IDE: http://www.technoblogy.com/show?19OV

Mighty core -- https://github.com/maniacbug/mighty-1284p

2021-02-18 18:46:08

minimal mqtt -- https://hackaday.com/2021/02/17/minimal-mqtt-with-micropython/

life at bell labsl -- https://hackaday.com/2021/02/17/james-west-began-40-years-at-bell-labs-with-world-changing-microphone-tech/

2021-02-18 21:08:49

https://github.com/adafruit/Adafruit-Prototyping-Pi-Plate-PCB

2021-02-19 12:11:26

Signal

flexible e-ink

[https://www.adafruit.com/product/4262?gclid=Cj0KCQiA4L2BBhCvARIsAO0SBdYCJRlLyAq1JfBmGYGTNmRsiYjVidXXcUxDisUhWo3SYs3PJMGjKjcaAkcEEALw_wcB]

signal-cli rest api here

Node serialport

https://www.npmjs.com/package/serialport

https://serialport.io/docs/guide-usage

https://stackabuse.com/executing-shell-commands-with-node-js/

Arduino serial

Serial input basics: https://forum.arduino.cc/index.php?topic=288234.0

Stuck serialports in linux

https://www.question-defense.com/2009/09/09/how-to-reset-a-serial-port-in-linux-ttys0-ttyam0-etc

2021-02-20 09:25:50

converting unix timestamp in javascript

let unix_timestamp = 1549312452
// Create a new JavaScript Date object based on the timestamp
// multiplied by 1000 so that the argument is in milliseconds, not seconds.
var date = new Date(unix_timestamp * 1000);
// Hours part from the timestamp
var hours = date.getHours();
// Minutes part from the timestamp
var minutes = "0" + date.getMinutes();
// Seconds part from the timestamp
var seconds = "0" + date.getSeconds();

// Will display time in 10:30:23 format
var formattedTime = hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);

console.log(formattedTime);

2021-02-27 10:04:55

Thoughts on radio setups ...

Thinking about establishing communication networks for off-grid locations ...

Cellular

Cellular coverage is spotty. If it's available, then it's a good system; it's what people are used to; but it can also be fragile to power outages.

2021-02-27 14:22:04

ideas: find the nodejs way of interpreting APRS

make a system that can get some standard message formats from internet / local lora, and combine with APRS, and show

make a 'feedmap' for belfast that shows all the gps feeds on one map

2021-02-27 14:26:27

imagery over lora -- http://ssdv.habhub.org/KW03PL

2021-02-27 15:00:48

slow scan digital imagery: http://tt7hab.blogspot.com/2018/04/the-lora-ssdv.html

2021-03-05 12:57:54

Burned bootloader!

General instructions -- http://www.technoblogy.com/show?19OV

BUT NOTE:

Forum post suggesting cap between RESET and GND on UNO when burning: https://forum.arduino.cc/index.php?topic=347441.0

2021-03-05 17:31:06

maybe this is a better mightycore to use ... https://github.com/MCUdude/MightyCore

YES indeed. looks like it's working ...

2021-03-06 13:58:58

Mark's code ported to 328p: https://freesoft.dev/program/136302037

This looks good:

lora aprs here

more details here

reverse tunnel ssh here

kiss aprs here

this looks even more directly useful for kiss: https://github.com/josefmtd/arduino-kiss

https://josefmtd.com/

arduino apros tracker here

more by that fellow here

2021-03-06 14:17:51

ahhh, so

https://github.com/jweers1/Aprs-Tracker/tree/master/Arduino/libraries/LibAPRS is the APRS library developed by the micromodem fellow;

and this repo pulls out particular functions from that lib and uses them in a simple manner

original library is here: https://github.com/markqvist/LibAPRS

manual here: https://github.com/markqvist/LibAPRS/blob/master/extras/MicroModem_Manual_v3.pdf

Much more extensive version of Arduino APRS here: https://github.com/handiko/Arduino-APRS

One to replicate

https://github.com/handiko/Arduino-APRS

Gnu radio test for APRS here: https://github.com/handiko/gr-APRS

Walkie talkie module http://www.dorji.com/docs/data/DRA818V.pdf

light aprs tracker https://www.qrp-labs.com/lightaprs.html

https://github.com/lightaprs/LightAPRS-1.0

2021-03-06 14:38:50

DIY walkie talkie https://www.radiojitter.com/walkie-talkie-arduino-shield/

generate aprs via arduino https://hamprojects.wordpress.com/2015/06/29/vhf-beacon-and-aprs-tracker-english-version/

WSPR tracker https://git.ok1kvk.cz/RAJlab/rajx-v5.0/

more references here: https://swharden.com/software/FSKview/wspr/

WSPR protocl https://www.nutsvolts.com/magazine/article/january2012_Steber

Seems like WSPR is optimized for longer-range, lower-power ... forward error correction. If one has ham license, is it permissible to transmit longer messages (not just location)?

https://www.rfzero.net/

minimal wspr transmit -- looks like a great place to start: http://blog.marxy.org/2018/12/minimal-wspr-transmit-with-arduino-and.html

another arduino wspr beacon project https://hamprojects.wordpress.com/2019/06/02/wspr-beacon/

wspr message types: https://dxplorer.net/wspr/msgtypes.html

using aprs while backpacking https://mthikes.com/backpacking-aprs/

more info on aprs https://www.jpole-antenna.com/2018/09/17/introduction-to-aprs-the-automated-packet-reporting-system/

messaging via aprs http://www.aprs.org/aprs-messaging.html

2021-03-07 17:29:26

ism band clock here: https://www.silabs.com/documents/public/data-sheets/Si4421.pdf

2021-03-07 17:33:36

RFM95 FSK here: https://teknokoodiradio.vuodatus.net/lue/2017/06/semtech-sx1278-fsk-packet-mode-decoding-with-arduino

jgromes radiolib https://github.com/jgromes/RadioLib --- wow!

micro keypad https://hackaday.com/2019/09/03/a-pocket-qwerty-for-arduino-and-more/

nice arduino keyboard link https://hackaday.io/project/158454-mini-piqwerty-usb-keyboard

another nice tutorial link https://create.arduino.cc/projecthub/cameroncoward/64-key-prototyping-keyboard-matrix-for-arduino-4c9531

2021-03-14 11:05:45

libaprs here: https://unsigned.io/projects/libaprs/

https://github.com/markqvist/LibAPRS

microaprs -- https://unsigned.io/category/microaprs/

standalone digipeater for micromodem: https://unsigned.io/digipeater-firmware/

https://github.com/markqvist/MicroDigi

http://extradio.sourceforge.net/extdigi.html

https://www.george-smart.co.uk/arduino/arduino_tnc/

https://www.vk3dan.ninja/2017/08/03/homebrew-aprs-arduino-uno-kiss-tnc/

and then ultimately, this: https://github.com/handiko/Arduino-APRS

https://www.instructables.com/Solar-Powered-APRS-Digipeater-for-Amateur-Radio/

lightaprs -- https://github.com/lightaprs/LightAPRS-1.0

nice thesis on all-in-one aprs tracker -- https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=1156&context=eesp

trackuino https://github.com/la3pna/trackuino-tracker

http://dangerousprototypes.com/blog/2018/05/22/si5351-vfo-project/

homebrew sdr -- https://swling.com/blog/2020/02/a-compact-homebrew-si5351-based-sdr/

https://swling.com/blog/2020/02/a-compact-homebrew-si5351-based-sdr/

https://circuitsalad.com/2020/01/06/compact-si5351-based-sdr/

https://electric-canary.com/fv1start.html

https://www.youtube.com/watch?v=V99YUq4r6Y8

replicate this! https://www.youtube.com/watch?v=V99YUq4r6Y8

that video allows for receiving aprs packets!

https://hamgear.wordpress.com/2015/02/03/make-your-own-transceiver-with-a-dorji-dra818u-or-dra818v/

this is the project to replicate! http://www.kh-gps.de/dra.htm

https://www.digikey.com/en/maker/blogs/2019/how-to-wirelessly-transmit-data-on-arduino

https://www.radiojitter.com/walkie-talkie-arduino-shield/

https://www.hamvoip.org/hamradio/818_transceiver_module/

sa818v -- https://www.youtube.com/watch?v=gDYYR8VvHMI

https://github.com/darkbyte-ru/SA818

diy ham radio -- https://www.youtube.com/watch?v=WrztebNYmOA

https://www.youtube.com/watch?v=XIwYHRFHXjk -- rda1846

this is the one to focus on: https://www.youtube.com/watch?v=V99YUq4r6Y8&t=10s

available unlicensed bands -- https://predictabledesigns.com/most-important-decision-when-creating-wireless-product/

https://lemosint.com/way-down-low-27mhz-an-unexpectedly-useful-radio-control-band-allocation/

also this: https://swling.com/blog/2020/02/a-compact-homebrew-si5351-based-sdr/

https://aa7ee.wordpress.com/2018/05/11/yup-its-another-si5351-vfo/

https://hackaday.io/project/171475-diy-sw-mw-sdr-radio-with-esp32-and-si5351

https://create.arduino.cc/projecthub/pu2clr/shortwave-arduino-transmiter-with-si5351-and-arduino-421602

https://hackaday.com/2015/09/13/arduino-masters-ham-radio-digital-mode/

https://www.qsl.net/zl1bpu/MFSK/FSQweb.htm

https://www.rtl-sdr.com/cyberspectrum-melbourne-building-a-cheap-fsq-transceiver-with-arduino-raspberry-pi-and-rtl-sdr/

https://hackaday.io/project/21007-2m-fsq-beacon

simple fsq beacon https://gist.github.com/NT7S/f22db15865f485c51139

https://nt7s.com/2020/06/empyrean-campaign-is-live/

https://rexburghams.org/assets/FastSimpleQSO_2015-09-02.pdf

https://www.qsl.net/zl1bpu/MFSK/FSQweb.htm

https://hackaday.com/tag/fsq/

https://www.rtl-sdr.com/transmitting-fm-am-ssb-sstv-and-fsq-with-just-a-raspberry-pi/

https://www.youtube.com/watch?v=v6B_womc6j8 -- fsq a new digital chat mode

https://oh8stn.org/blog/2017/12/22/fsq/

http://www.w1hkj.com/beginners.html

https://www.hamradioandvision.com/installing-fldigi-for-linux

https://km4nmp.com/2020/01/11/installing-fldigi-on-the-raspberry-pi/

http://www.w1hkj.com/files/fldigi/fldigi-help.pdf

http://appnotes.etherkit.com/2015/09/arduino-fsq-beacon-on-the-si5351a-breakout-board/?print=pdf

https://www.youtube.com/watch?v=IfwCT3GyNac -- fsq

https://oh8stn.org/blog/2017/09/11/hamradio360-fsq/

https://www.kb6nu.com/try-fsq-for-fast-simple-qsos/

https://www.sotabeams.co.uk/blog/fsq-data-system-tested/

https://www.youtube.com/watch?v=2xdaYg7X3I4

decoding digital modes https://cupano.com/index.html%3Fp=558.html

https://qrznow.com/fsqcall-new-digital-mode/

https://www.qsotoday.com/podcasts/zl1bpu

https://hwcdn.libsyn.com/p/f/9/f/f9f1e3c252ba35ee/Episode_071_Murray_Greenman_ZL1BPU_Final.mp3?c_id=10479912&cs_id=10479912&expiration=1615255344&hwt=97d676bfab1bb513997ad660d0153860

https://www.qsl.net/zl1bpu/MFSK/Index.htm

psk modem -- http://www.kk5jy.net/psk-modem-v1/

https://hackaday.com/2017/03/24/shut-up-and-say-something-amateur-radio-digital-modes/#more-245950

https://www.youtube.com/watch?v=7vH-dm-45WU -- review of ham radio modes

ft-8 sounds like weird siren songs

https://forums.qrz.com/index.php?threads/goodbye-ft8-hello-olivia-the-magic-digital-mode-for-hf.585617/

http://js8call.com/

js8call -- https://www.youtube.com/watch?v=pipjA4ZsqU8

using js8call -- https://www.youtube.com/watch?v=pipjA4ZsqU8

js8call relays and messaging -- https://www.youtube.com/watch?v=vka7H7ks-VM

rf zero board! -- https://www.rfzero.net/

rf zero schematic - https://www.rfzero.net/downloads/rfzero_schematic_v12.pdf

interesting here: https://www.rfzero.net/downloads/rfzero_schematic_v12.pdf

http://utah-dcc.org/2020/KK7L-UDCC2020.pdf

https://miscdotgeek.com/august-2020-update-camping-knives-trike-truck-and-js8call/

https://groups.io/g/js8call/message/9852

https://groups.io/g/js8call/topic/js8call_mobile_aprs/78293418?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,78293418

installing js8call - https://www.youtube.com/watch?v=SdwR7yAVlZk&list=PL1QTYT4Qo9caJ2MaRG3D015f6aVK_D3ua

js8call mobile + aprs -- https://groups.io/g/js8call/topic/js8call_mobile_aprs/78293418?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,78293418

js8call baofeng -- https://www.youtube.com/watch?v=Y_teUXOdBS0

aprs position off-grid with js8call https://www.youtube.com/watch?v=dAiXsSMIkKY

watching aprs activities around you

http://www.knology.net/~gmarcus/Si5351/Si5351A_WSPR_XCVR.pdf

https://antrak.org.tr/blog/projeler/poor-mans-hf-ssb-receiver-lets-build-it/

https://www.qrp-labs.com/synth/synthnoise.html

js8call instead of aprs -- https://groups.io/g/js8call/message/9852

gps gridsquare -- https://www.youtube.com/watch?v=DpzC7g-gY44

fv1 based sdr -- https://circuitsalad.com/2020/11/13/the-fv-1-based-sdr-revisited/

http://www.knology.net/~gmarcus/multifunction_files/w3pm_multifunction_project_2.pdf

-- this project does uses the si part to generate a wspr radio -- http://www.knology.net/~gmarcus/multifunction_files/w3pm_multifunction_project_2.pdf

-- http://wb6cxc.com/wp-content/uploads/2019/04/Presentation-1-0.pdf

short wave transmitter using si chip and arduino -- https://create.arduino.cc/projecthub/pu2clr/shortwave-arduino-transmiter-with-si5351-and-arduino-421602

list of tutorials on FSK -- https://www.youtube.com/results?search_query=si5153+fsk+

https://www.youtube.com/watch?v=XpxEs2_0ygg

2021-03-14 11:16:42

From Dave S.

I wanted to capture here some of the different links of these radios (transmitters, receivers, and transceivers) based on a combination of an Arduino MCU and the SI5351 Clock Generator / Phase Locked Loop with an I2C interface.

(Here's an example of a module from Adafruit containing the SI5351 with some voltage translation and regulator on-board: https://www.adafruit.com/product/2045)

I think the most comprehensive and well documented/discussed of these projects is this one: https://github.com/threeme3/QCX-SSB The readme has some great info on the origins of this project, some nice schematics and block diagrams, details of operation, and a credits section at the end that gives the lineage of the technologies, circuits, and algorithms that influenced this project.

This project started as a mod to a Morse Code transceiver kit sold by QRP-Labs that added support for single-sideband voice and many digital modes and simplified the orginial circuit too! It's now moved beyond that to a design that can be built either as a mod to the original kit or with a custom PCB and parts ordered from various sources.

As mentioned, there's a new projection under discussion of building a more portable version of this design as well here: https://groups.io/g/ucx

If you look at the block diagram here: https://github.com/threeme3/QCX-SSB#technical-description it would be pretty easy to simplify the schematic and, hopefully dissect the code, to be just the parts required for the receiver.

I also found the link form the fellow in Turkey that did the receiver design.

https://antrak.org.tr/blog/projeler/poor-mans-hf-ssb-receiver-lets-build-it/

Its block diagram is very similar to the receive part of the design above. I noticed that he just sends the baseband (audio) signal to a PC via an audio plug rather than bringing it into the Arduino for further processing, which is what the QCX-SSB does.

I also see that his latest blog topics are focused on doing his over version of the same UCX project that the QCX-SSB folks are working on now.

2021-03-14 11:24:31

https://dl2man.de/qcx-mini-usdx-mod/

2021-03-31 18:15:14

radio https://www.radiojitter.com/walkie-talkie-arduino-shield/

these chips for location are really interesting https://www.radiojitter.com/product/mc-1612-dg/

DORJI module VHF Band HAM Amateur Radio Module DRA818V Home : http://www.dorji.com/products-detail.php?ProId=55

ham radio module https://www.ebay.com/c/943323740

2021-04-09 10:23:55

serial input basics

https://forum.arduino.cc/index.php?topic=288234.0

2021-04-10 14:42:07

https://github.com/arduino-libraries/Arduino_OV767X

https://maker.pro/arduino/tutorial/how-to-interface-the-ov7670-camera-module-with-arduino

One of the modules has a solder ball on the PCLK trace. The other module appears to be fine. I'll update my review once I capture a couple of images from them.

Update: Both camera modules work. Documentation is the absolute worse. The default color settings don't appear to work properly. The secret to YUV with correct colors is writing address 0xB0 with 0x84 (This is a reserved register. I have no idea what this does).

I used these coefficients for the YUV to RGB conversion
r = y + 1.371*(v-128);
g = y - 0.698*(v-128) - 0.336*(u-128);
b = y + 1.732*(u-128);

2021-04-10 15:06:18

https://www.instructables.com/OV7670-Arduino-Camera-Sensor-Module-Framecapture-T/

https://www.arducam.com/product-category/standone-camera-modue/

2021-04-10 16:32:02

esp32 ...

https://bitluni.net/esp32-i2s-camera-ov7670

https://www.youtube.com/watch?v=S2yTQHM82jc

2021-04-10 16:37:01

express memory explainer: https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python-circuitpython/uf2-bootloader-details

2021-06-26 09:50:13

Using ADC to capture waveforms ...

2021-10-29 15:01:08