More Videos, more Transciever boards

Codec2

started watching “David Rowe presents on codec2 and SM1000”

quite interesting on how voice is borkend down by sine waves, how you can have 2 kinds of encodings AAA and BBB and how the bits are brokend up to encode voice

Bit Allocation

52 bits per 40ms frame, or 1,300 bit/s

Parameter	Bits/Frame
Amplitudes	36
Frame Energy	5
Voicing	4
Pitch	7
Total	52

also sound demos between this and a bunch of other formats
https://freedv.org/ fro more on the codec.
which you can run on a computer
or via the SM1000
- probably up to https://youtu.be/MxqdGL8QfIA?t=1464
also uses STM32F4 which sounds like a good thing for up power from an arduino
- https://core-electronics.com.au/stm32f411-blackpill-development-board-49034.html
- more of a professional board
at the end he mentions an OpenRadio SDR kit that seems to be offline these days.
- a good write up https://blog.marxy.org/2015/01/openradio-sdr-kit-build.html
  - original url - http://openradio.net.au/index.php/Main_Page https://web.archive.org/web/20160302125731/http://openradio.net.au/index.php/Main_Page
  - construction guide https://web.archive.org/web/20160306200642/http://openradio.net.au/index.php/Construction_Guide_V2
  - although there might still be some luck finding something similar when searching for “sdr radio kits”
    - https://www.sdr-kits.net/

All the Transciever options

APRS packet radio decoding

saw this on Instagram: gridbasedotnet - How I run APRS for grid down comms at all times
- connect standard radio with something like a DigiRig sound card VHF/UHF Digital Modes with budget HTs
  - not end-to-end digital systems such as DMR, D-star and Fusion.
  - but ability to connect computer bits and bytest to analog radio beeps and boops whilst running a computer or RasPi with Winlink, WSJT-X, JS8Call, Fldigi, SSTV/Yoniq etc
    - there sounds like there also used to be QTMM archived on GitHub
      
      An obsolete AFSK1200 decoder that uses the soundcard as input device.
- process through Dire Wolf https://github.com/wb2osz/direwolf
  
  Dire Wolf is a software “soundcard” AX.25 packet modem/TNC and APRS encoder/decoder. It can be used stand-alone to observe APRS traffic, as a tracker, digipeater, APRStt gateway, or Internet Gateway (IGate).
- feed the APRS to YAAC “Yet Another APRS Client” https://www.ka2ddo.org/ka2ddo/YAAC.html
- ultimately getting location data and ability to message between nodes

LoRa LilyGo T-Bone

which kind of sounds like my LilyGo T-Bone LoRa radios

433MHz

or could be something some cheap 433MHz TX/RX boards would want to do

Zigbee

or maybe a zigbee mesh - where I just got some controllers today

RFM69

and if I search for Arduino and PacketRadio I quickly come across RFM69
- which quickly took me to Adafruit Feather M0 Radio with RFM69 Packet Radio
- and of course https://lowpowerlab.com/
  - the creators of the library https://github.com/LowPowerLab/rfM69/
  - have a bunch of relevant stuff in their store to build stuff like
  - seem to have an Arduino like clone - Moteino M0
  - an RFGateway (M4)
  - and yet another video to watch RF Range Testing a concrete building application - Felix Rusu
  - and ofcourse a bunch of RFM69CW transcievers for ~$6
    - 433MHz, 868-915MHz, LoRa - so it sounds like it is a base for various frequencies? - ofcourse these are licence free bands and limited to 100mW
    - RFM69CW

WiFi

Then ofcourse ESP32 let’s you do WiFi
- https://github.com/jasoncoon/esp32-fastled-webserver

Another Yagi tape measure build

How to Make an Incredible DIY Directional Antenna for Almost Nothing - The Modern Rogue

this one kind of was nice to hear a bunch of stuff that seems not obvious like does the boom have to be metal or not? all the pro ones are metal and the home brew seem not to be? but I guess it is in the direction of the RF so maybe it does not matter? still I feel I need to read the ARRL antenna handbook again to know exactly what and why. Also there was no mention of where the Yagi calculations came from, a website calculator no doubt? and finally there is no mention of how close or far the driven beams should be where they are at their closest? what differenc does it make? oh and throwing in a “hairpin” wire to be the matching wire? that seems random.

DIY Yagi Antenna from Tape Measure - Becky Stern

really nice build with 3D printed parts and some clever joining mechanism, still no mention of why the haripin is needed and what it does

uses CubicSDR cubicsdr.com
- https://github.com/cjcliffe/CubicSDR
  
  Cross-Platform Software-Defined Radio Application www.cubicsdr.com
also using a NanoVNA to try to tune it

and a bunch more videos

Make Your Own Aircraft Tracking Antenna With RTL SDR - Tech Minds

pretty run of the mill and basic
but gives confidence
calculator https://m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/
uses software RTL1090
use of a Nooelec SAWbird+ ADS-B filter
compares to a pro antenna and reciver and not much in it

How to make a 2 meter band tape antenna: Lightweight, portable, fun project for ham radio - Ham Radio Rookie

mentions inspiration by John Portune - W6NBC
the idea is to use copper tape to make antennas
you can easily extend the antenna by adding more copper tape
using magnets either side to move connector around

Building A Directional Yagi Antenna for 144 VHF or 433 UHF Amature Radio! - Concentric Machining

calculator https://www.changpuak.ch/electronics/yagi_uda_antenna_DL6WU.php
reflector needs to be grounded - not sure I have heard that before
hitting copper tube between vice grips and vice to straighten, just bang it with a hammer 5 times
dipole split needs to count to the length of the dipole, ie less metal how much the gap, in this casde 1/4 inch
grouding the entire beam
way too long a build - and boring

Cubical Quad Antenna, is this the best directional antenna? - KK6USY Ham Radio Adventures

difficult build
lot’s of 3D
calculator https://www.pasty.com/~ccraa/antennas/Cubical-Quad1.htm
- seems to be all JS, maybe time to downlaod it as not sure how long it will last
- in fact quite an interesting listing via google
  - https://www.google.com/search?q=site%3Apasty.com+antenna
does make me feel if creating the body with solid shapes and lay copper down

Where to Radiosonde

seems a bunch of sondes landed around Moe/Trarallgon and were found A bunch landed near Seymour and were not found and Today’s went to King Lake which is kind of driving distance

via radiosondy.info startplace Melbourne (AU)

Number/Type	Last Frame (UTC)	lat/long/Alt	Freq.	Nearest City	Status
U4844272 RS41	2024-03-05 01:28:44	-37.4746 145.264 531 m	401.5	Whittlesea (AU)	UNKNOWN
U4844264 RS41	2024-03-04 13:13:04	-37.1845 145.058 852 m	401.5	Broadford (AU)	UNKNOWN
U4824680 RS41	2024-03-04 01:33:31	-37.0841 145.077 1034 m	402.5	Seymour (AU)	UNKNOWN
U4824664 RS41	2024-03-04 01:11:15	-37.1065 145.064 927 m	401.5	Seymour (AU)	UNKNOWN

U4824676 RS41	2024-02-28 07:30:47	-38.2341 146.434 488 m	401.5	Morwell (AU)	FOUND
T0340638 RS41	2024-02-28 02:38:46	-38.1968 146.035 588 m	401.9	Trafalgar (AU)	FOUND
U4824682 RS41-SG	2024-02-28 01:17:30	-38.0716 145.942 474 m	401.5	Warragul (AU)	FOUND

U4844239 RS41-SG	2024-02-24 13:31:46	-37.028 145.317 887 m	401.5	Seymour (AU)	UNKNOWN
U4844271 RS41	2024-02-24 01:43:31	-37.1302 145.16 1038 m	401.5	Broadford (AU)	UNKNOWN
U4844280 RS41	2024-02-23 13:33:29	-37.3127 145.226 689 m	401.5	Broadford (AU)	UNKNOWN

U4844283 RS41	2024-02-23 01:27:14	-38.0807 146.308 361 m	401.5	Moe (AU)	FOUND
U4844275 RS41	2024-02-22 13:56:58	-38.291 146.597 574 m	401.5	Traralgon (AU)	LOST

seems like a bunch of sondes around Moe/Traralgon/Trafalgar are found
and ones around Seymour/Braodford/Whittlesea are not
today’s being a classic example of not being too far away
- https://radiosondy.info/sonde_archive.php?sondenumber=U4844272