Black Cat Systems

Follow our tweets!

Lost Reg Code?
Online KiwiSDRs
macOS Software
Windows Software
Ham Radio iPhone/iPad
Linux Software
Update Policy

USB Icom CI-V Interface

Radio Hobbyist Products

  22m Programmable Beacon Kit
  22m Part 15 Beacon Kit
  CW Keyer For Beacons Kit
  Jellyfish Transformer
  Cyclops Antenna Transformer

General Interest Programs

  Atomic Mac/PC
  Audio Toolbox
  Black Cat Timer
  Diet Sleuth
  Graph Paper Maker
  Health Tracker
  Image Resizer
  Knitting Wizard
  Label Wizard
  Prog Audio Gen
  Sound Byte
  Synth 76477

Amateur Radio Programs
  AirSpyHF+ Server
  Black Cat Absolute ACARS
  Black Cat ACARS
  Black Cat ALE
  Black Cat ALE Vacuum Cleaner
  Black Cat NetFinder
  Black Cat GMDSS
  Black Cat HF Fax
  Black Cat SSTV
  Carrier Sleuth
  Cocoa 1090
  Cocoa RTL Server
  DGPS Decoding
  DX Toolbox
  eQSL Factory
  KiwiSDR Monitor
  KiwiSDR Sound Client
  Morse Mania
  RF Toolbox
  SDRuno Plugin
  SDRuno Equalizer Plugin

iPhone/iPad Apps
  Atoms To Go
  dB Calc
  Clik Trak
  DGPS Decoder
  Drill Calc
  DX Toolbox
  Elmer Extra
  Elmer General
  Elmer Tech
  Feld Hellschreiber
  Field Strength Calc
  Function Generator Pad
  HF Weather Fax
  Morse Mania
  Morse Pad
  Packet Pad
  PSK31 Pad
  SSTV Pad
  Photon Calc
  Rad Map Tracker
  RF Link Calc
  SelCall Tone Gen
  Sound Byte
  Sound Byte Control
  Spectrum Pad
  SWBC Schedules
  Synth 76477
  Synth Motion
  Transmission Line Calc
  Weather Calc
  Wire Calc

iPhone/iPad Bundles
  RF Calculator Apps
  Ham Radio Decoder Apps
  Audio Utility Apps
  Shortwave Weather Apps
  Ham Radio Exam Study Apps
  Shortwave Decoder Apps

Android Apps
  Audio Function Generator
Audio Spectrum Analyzer
DGPS Decoder
  HF Weather Fax
  Rad Map Tracker
  SelCall Tone Gen
  Sound Byte Control
  SWBC Schedules
  Wire Calc

About Black Cat Systems
Site Map
Our software for Mac OSX
Privacy Policy
Apple /// Emulator

Macintosh Links
Shortwave Radio
Pirate Radio
Spy Numbers Stations
Science and Electronics
Ham Radio Software


Note: Sonde is currently in beta, there may still be bugs so please be sure to download and fully test your copy before purchasing. Sonde only works with some radiosondes used in the USA.

Sonde Radiosonde Decoder

Sonde is an app to decode radio transmissions from radiosondes (weather balloons). It is available for Windows (7, 8, and 10) as well as macOS 10.9.5 and later.

It currently can decode LMS6 and Mark IIa style radiosondes. Support for other styles could be added, I would need high quality recordings of them for testing purposes.

Sonde can decode live audio from a sound card input, as well as from WAVE recordings. The position (latitude, longitude, altitude) of each message received is displayed, along with some other information. Sensor readings are not displayed. This information be used to track the radiosondes in real time, and aid in their recovery.

Buy Your Copy of Sonde

Download Options:

Sonde 0.4.1 for Mac OS X - Mac OS X 10.9.5 and later - ZIP file - 9 May 2019

Sonde 0.4.1 for Windows - Windows 7, 8, 10 - ZIP file - 9 May 2019

Purchase Option Price Delivery Details

$19.99 Email Registration code sent by email, software download

Email your comments and questions to

Last modified May 9, 2019