Tag Archives: Monitoring

ARINC & FDM-S2: Three Channels in a Row


ELAD’s FDM-S2 provides the output of three different channels within a given HF bandwidth of up to nearly 5 MHz. Hence, you may decode these channels in parallel. ARINC’s reporting system of ground and airborne stations is an excellent candidate to show this feature.

This paper is a step-by-step introduction in how to set up the receiver, the virtual audio cables (VAC), decoder, documenting software and Google Earth to show the results on the globe.

You may then easily configure hard&soft for other applications, e.g. the monitoring of GMDSS channels with communications from ship and shore.

Signals Analyzer: How to do it


With “Signals Analyzer”, the late Russian expert Sergey developed an excellent software to analyze digital signals. There still is no better software around to do this job at a budget price.

Signals Analyzer – Step by Step provides a short introduction in using this software with audio recordings.

It is a basic version of a German paper of 28 pages which you will find here. Thanks to its 65 and mostly self-explaining screenshots, it will make  an interesting reading also for people who don’t speak “The Awful German Language” (Mark Twain, 1880). Click here to download this enlarged Version.
Google Translate also offers a great help in reading it.

[Deutschsprachige Leser finden eine mit 28 Seiten und 65 Abbildungen ausführlichere Version dieser Einführung in die Analyse-Software “Signals Analyzer” hier.]

Here you find a link to the software and to additional information.

Antonio is one of the most avid users of this software and provides many examples on how to use it on this page.

Living Sonagram: A revolutionary tool for Monitoring


Monitoring of wide frequency ranges can be an art. And hard work, too. The technique ot the “Living Sonagram” makes this task easy:

  • record a frequency range of up to 10 MHz, for e.g. 24 hours or less or more
  • define a range of time ad frequency you want to analyze offline
  • build up the “Living Sonagram”
  • tune. demodulate, and decode in this whole range just with your mouse (see screenshot on top)

You must see this to believe it!

The Software has been developed by Simon Brown.

I wrote this paper as a step-by-step introduction into this technique.

You may also look this video on this topic.

CIS Airport Nets (SSB): Introduction and Examples

Monitoring CIS Airport Nets

In the last time, I had been fascinated by Russian lady’s voices. First, I bumped into some very short, disciplined radio checks on the cis-Caucasian net on 5.568 kHz. I spent many hours until I got all identifications of these coded airports. Then I was absorbed by exotic destinations as Samarkand, Turkmenbashi, Vorkuta, Astana … onother frequencies. What a fascinating continent of DX! Read more

15 MHz record, play & analyze: How to do it


SDRs give us the chance to receive, record, play and analyze wide frequency ranges. The width is a trade-off of resolution (in bit) and transfer rates via the SDR’s interface and/or writing to hard disk.

Recently, I connected the ELAD’s FDM-S2 to one PC to achieve a combined bandwidth of 18,3 MHz, of which nearly 15 MHz are alias-free / at 16 bit resolution. All went smoothly. Read more

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