Tom M0LTE M0LTE

KISS is a super simple framing technique for packet radio TNCs.

Simplistically, a KISS TNC can be commanded to send an AX.25 frame out of its first (or only) port by prefixing it with 0xC0 0x00. See http://www.symek.com/g/smack.html

As well as KISS over serial, BPQ can do KISS over TCP or UDP. I assume the Linux kernel can too.

FreeDV (codec2) has a data transmission API. Codec2 ships with a pair of minimalistic demo programs for transmitting and receiving arbitrary data through FreeDV via stdin/out. The transmit program takes data on stdin and outputs audio bytes to stdout. The receive program takes audio bytes on stdin and outputs the original data on stdout.

Source of the two programs:

	SIMPLE
	NODECALL=MB7NGP
	NODEALIAS=GILWEL
	LOCATOR=JO01ap
	PASSWORD=xxxxxxxx
	AUTOSAVE=1
	NODESINTERVAL=10
	MINQUAL=10
	IDINTERVAL=15
	IDMSG:

	SIMPLE ; sets a lot of defaults
	NODECALL=GB7RDG ; Node callsign
	NODEALIAS=THURST ; Node alias (6 characters max)
	LOCATOR=IO91lk ; Maidenhead locator
	MAPCOMMENT=40m, 6m, 2m, 70cm

	PASSWORD=xxxxxxxx
	AUTOSAVE=1
	EnableEvents=1
	EnableM0LTEMap=1

	#(as non-root, on a Pi 2B, Raspbian 11)
	mkdir linbpq
	cd linbpq
	wget https://www.cantab.net/users/john.wiseman/Downloads/pilinbpq
	mv pilinbpq linbpq
	chmod +x linbpq
	sudo setcap "CAP_NET_ADMIN=ep CAP_NET_RAW=ep CAP_NET_BIND_SERVICE=ep" linbpq
	mkdir HTML
	cd HTML
	wget http://www.cantab.net/users/john.wiseman/Downloads/HTMLPages.zip

	using System;
	using System.Linq;
	using System.Net;

	/// <summary>
	/// A .NET type which parses the format of UDP datagrams emitted from WSJT-X on UDP port 2237,
	/// for the Decode message type (the type emitted when WSJT-X decodes an FT8 frame)
	/// </summary>
	public class DecodeMessage
	{

	4.2V
	3.7V
	3.0V

	5s = 21.0V -> 18.5V -> 15V
	4s = 16.8V -> 14.8V -> 12V
	3s = 12.6V -> 11.1V -> 9V

	13.8V + 10% = 15.18V
	13.8V - 10% = 12.42V

	{
	"1A": [
	{
	"ctry": "Sov Mil Order of Malta",
	"pre": "1A",
	"tz": -1.0,
	"lon": -12.43,
	"lat": 41.9,
	"cnt": "EU",
	"itu": 28,

	#in /root/update-wordpress.sh:

	#!/bin/bash -e
	export PATH="$PATH:/usr/local/bin"

	# change this
	siteroot=/var/www/html
	webserveruser=nginx

	wp cli update --quiet

	void setup() {
	pinMode(6, OUTPUT);
	pinMode(10, OUTPUT);
	Serial.begin(9600);
	}

	void loop() {
	digitalWrite(10, HIGH);
	delay(1000);

	C1, C2 133-5699 82pF A82J (blue)
	C3, C7, C101, C102 191-985 2.2uF (must be poly-carbonate in signal path) mmkbjo63-
	C4, C5, C10, C13 538-1310 100nF k5k 104 (yellow)
	C6 538-1146 10pF k2j 100 (yellow)
	C8, C9 312-1582 330nF
	R1 148-528 1.2kΩ
	R2 148-578 2kΩ
	Q1, Q2 739-0381 PN2222 / ZTX653 / MPSH10
	D1, D2, D3, D4 671-5477 1N4148
	CON1,2,3 512-1225 RF-BNC