Kevin Elliott kevinelliott

WebSDR Reverse Engineering - Documentation Index

Date: October 25, 2025 Project: WebSDR CLI Audio Quality Investigation Status: ✅ Phase 1 Complete - Documentation Ready

🎯 Executive Summary

Download Alpine Linux Virt image

Visit Alpine Linux Downloads and copy the URL for the Virtual image associated with your Proxmox architecture.
Paste the URL in to download on your ISO Images storage drive in your Proxmox datacenter.

Create the initial VM that will become the template

Wizard Tabs
- General
  - VM ID: 9001 (or next available in the 9000 series.
Name: alpine-3.22-cloudinit

Trying to figure out how to capture the audio from the WebSDR @ Twente.

http://websdr.ewi.utwente.nl:8901

Mirror the websdr site

wget --mirror http://websdr.ewi.utwente.nl:8901

Current Efforts

The ruby script will successfully pull down the audio IQ, however the IQ cannot be played in Audacity. I believe this is because the audio is encoded or otherwise slightly mangled to deter us.

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macOS 10.15 Catalina Mostly-Automated Setup

An easy to refer to document for regularly setting up macOS 10.15 Catalina.

Controversy

The topic of recipe-based frequent fresh reinstalls of macOS is a controversial issue. Some people are against reinstalling macOS, citing that they have never had an issue with Apple provided upgrade installs.

Steganography Tools

Installing Blockstream Satellite on Raspberry Pi 3B

Raspberry Pi 3B is architecture armhf (arm7l + floating point) but you can install the Ubuntu MATE experimental amd64 image.

Install Ubuntu MATE

Download image
Decompress image
Write image to SD card
Insert SD card into Raspberry Pi 3B

	#!/usr/bin/env bash

	IRIDIUM_TOOLKIT_PATH="$HOME/iridium-toolkit"
	SDR_CONFIG="$HOME/iridium-config/airspy.conf"
	SDR_DECIMATION="4"
	LOG_PATH="$HOME/iridium-logs"

	ACARS="true"
	ACARS_STATION_ID="XX-YYYY-IRIDIUM1" # Recommended: XX-YYYY-IRIDIUMN where XX is your initials, YYYY is your nearest medium/large airport ICAO, and N is the instance number
	ACARS_ADDITIONAL_OUTPUTS="udp:47.150.14.53:1987" # Additional output destinations for ACARS messages. Example: "tcp:remotehost1:4444,udp:remotehost2:5555"

	#!/bin/bash

	# Prep
	mkdir ~/source
	sudo apt update
	sudo apt install -y git

	# libacars
	sudo apt install -y build-essential cmake pkg-config libglib2.0-dev libconfig++-dev libliquid-dev libfftw3-dev git
	cd ~/source

	#!/bin/sh

	TEZOS_HOST_PATH="/tezos"
	TEZOS_SNAPSHOT_URL="https://mainnet.xtz-shots.io/full"

	mkdir -p ${TEZOS_HOST_PATH}/snapshots
	wget -O ${TEZOS_HOST_PATH}/snapshots/full ${TEZOS_SNAPSHOT_URL}

	#!/bin/bash

	apt update
	apt install -y \
	apt-transport-https \
	ca-certificates \
	curl \
	gnupg \
	lsb-release \
	httpie \