Black Cat Systems
Follow our tweets!

Home
Purchase
News
macOS Software
Windows Software
Ham Radio iPhone/iPad
Linux Software
Documentation
Support/FAQ
Update Policy
Lost Reg Code?

Radiation Detectors
USB Icom CI-V Interface
MIL-STD-188 Interface

Radio Hobbyist Products

  22m Part 15 Beacon Kit
  CW Keyer For Beacons Kit
  Squid Transformer
  Potted Squid Transformer
  Cyclops Antenna Transformer

General Interest Programs

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

Amateur Radio Programs
  AirSpyHF+ Server
  Audiocorder
  Black Cat ACARS
  Black Cat CW Keyer
  Black Cat HF Fax
  Black Cat SSTV
  Carrier Sleuth
  Cocoa 1090
  Cocoa RTL Server
  DGPS Decoding
  DX Toolbox
  Elmer
  eQSL Factory
  MatchMaker
  KiwiSDR Sound Client
  MININEC Pro
  Morse Mania
  MultiMode
  mySdrPlayback
  RF Toolbox
  SelCall
  Sonde

iPhone/iPad Apps
  ALE
  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
  GMDSS
  Godafoss
  HF Weather Fax
  iAttenuate
  iFunctionGenerator
  iGeiger
  iSoundex
  iSoundByte
  iSweep
  iUnit
  Morse Mania
  ACARS Pad
  Morse Pad
  NAVTEX 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
  ACARS
  Audio Function Generator
  
Audio Spectrum Analyzer
  
DGPS Decoder
  HF Weather Fax
  NAVTEX
  Rad Map Tracker
  SelCall Tone Gen
  Sound Byte Control
  SWBC Schedules
  Wire Calc

About Black Cat Systems
Geiger Counter
Site Map
Our software for Mac OSX
Privacy Policy
Press/Media
HFunderground
Apple /// Emulator

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


   

KiwiSDR Sound Client

Based on the kiwiclient python script, this will connect to a remote KiwiSDR, and stream the audio to a virtual audio device on your computer in real time, so you can route it to a decoding program, such as for SSTV, FAX, RTTY, and so on.

First a warning, this code is not a piece of art. It was quickly thrown together so I could route audio to decoding apps. It certainly needs some work :)

The original kiwiclient is available here: https://github.com/jks-prv/kiwiclient

You will want to download that first.

If you don't have pip installed, you need it: sudo easy_install pip

You also need to make sure you have the python sounddevice library installed, if not, install it: python -m install sounddevice --user

And you need numpy if you don't have it already: python -c "import numpy"

The script requires the device number of the sound device to route audio to, this can be done with python -m sounddevice

$ python -m sounddevice
   0 Built-in Microphone, Core Audio (2 in, 0 out)
<  1 Built-in Output, Core Audio (0 in, 2 out)
   2 HDMI, Core Audio (0 in, 2 out)
   3 USB Audio Device, Core Audio (1 in, 2 out)
   4 iMic USB audio adapter, Core Audio (0 in, 2 out)
   5 iMic USB audio adapter, Core Audio (2 in, 0 out)
>  6 Soundflower (2ch), Core Audio (2 in, 2 out)
   7 Soundflower (64ch), Core Audio (64 in, 64 out)
   8 Aggregate Device, Core Audio (6 in, 2 out)
   9 Aggregate Device2, Core Audio (4 in, 0 out)
  10 Multi-Output Device, Core Audio (0 in, 2 out)
In this case, my virtual audio device, SoundFlower, is device number 6.

Here's an example, streaming audio from my KiwiSDR tuned to 14230 USB for decoding SSTV: python kiwisound.py -s sdr.hfunderpants.com -p 8073 -f 14230.0 -m usb -L 700 -H 3000 --out-device 6 --ncomp --resample 12000

Let's break down the arguments:

-s sdr.hfunderpants.com The url of the KiwiSDR
-p 8073 The port number
-m usb The mode, USB in this case
-L 700  The lower IF filter frequency
-H 3000 The upper IF filter frequency, we're using 700-3000 Hz to get just the SSTV audio
--out-device 6 The number of the sound device to route audio to
--ncomp No compression
--resample 12000 Resample the audio to 12000 Hz

Download a copy of kiwisound.py: https://www.blackcatsystems.com/download/kiwisound.py.zip (March 23, 2019)

Now maybe you need some apps to decode SSTV, FAX, or other modes?? Look on the left side of your browser window, I have lots to choose from :)


Email your comments and questions to info@blackcatsystems.com

Last modified March 23, 2019