XSL - Japanise Slotmachine itself

XSL - Japanise Slotmachine
Japanise Navy? PSK-4, Br-1500

the signal

the synthesis-model of the signal


Author: SergUA6 6.0
(Band Width) ~2000-2050 Hz
(Low Range) ~400 Hz, shift is possible. recieving in SSB
(Baud Rate) 1500 Hz
n-Ary (PSK/MPSK) 4
(Carrier frequency) ~1512 in this record. shift is possible. recieving in SSB
(ACF) ~94-100 ms
(RX mode) SSB

Sonograms(pictures 1,2,3)

pic.1 The general look of the signal

pic.2 manipulation speed

pic.3 4th harmonic of the signal

pic.4 Diagrams (phase constellation of the signal)

XSL Japanise Slotmachine - is the popular enought signal, and at the same time, it is very difficult for the analysis. Complexities are connected with the quality of records first of all. From all variety of the found files, only that record has allowed to analyze the signal well. The signal is very bright as we can hear, and as we also can see on the spectrum. These two factors, together with ACF, allow to identify the signal very reliably.

The example of the analyzed signal

The ACARS VHF signal
AirSystem

the signal is here http://signals.radioscanner.ru/base/files/signal24/f1.wav

Author - SergUA6

Band Width - 2400-2700 Hz

Low Range - 300-400 Hz

Baud Rate - 2400 Hz

Count of Carriers – There are two practically not distinguishable frequencies of manipulation,
with strongly fixed values of 1200 and 2400 hertz, hard fixing is provided by a transmission mode with AM(amplitude modulator).

Step between carriers - 1200 Hz

RX mode – AM

Sonogram pic.1

Diagram pic.2

Diagram pic.3

ACARS VHF - it is one more system that is used in aircraft, in difference from HFDL, it is used only on VHW and only in AM mode, range of operation is limited by a working range of used frequencies and does not exceed 400-500km. Modulation of radiation is АМ, the signal represents GFSK manipulation with carriers 1200 and 2400 hertz and with speed of manipulation of 2400 hertz. There shouldn’t be difficulties with identification of this signal. At first there are no any signals in AM mode in aviation range with such characteristics, secondly the signal has features, which are very well visible after demodulation(check graphics), thirdly the signal has standard frequencies, which are must be known, because, by virtue of the very short time of transmission, to meet these signals accidentally is very hard.

This signal is analyzed and ready for decoding.

What SA project is?

Air is full of different mysterious sounds. For some people these sounds mean nothing, while for others it is the whole world of signals. As far as our team is in total passion with analysis of the signals, we have decided to help everyone, who is into ham sphere and interested in the signals. Therefore, since SA project was started, we got lots of letters and questions about different signals. People send us various signals and ask to identify them. Here goes one of the main goals of SA-it is to help everyone from professional analysts to amateurs in such not easy task as analysis of the signals. We surely can say that SA program has unique set of tools, which allows to do very high-quality analysis of the various signals and also unclear, strange, unknown signals.

So, it is very important to understand the place and goals of the signals analysis.
And this question should be considered from the start. Why do we catch and record all these signals and records? We want to open a secret what is inside of either, one or another signal. We want to decode it. But can we just record some signals and put them into decoder? Especially, when these signals are unknown, unclear or just strange. No, we can’t. Decoders must be informed very well, with which material they are going to work. The signal must be prepared at first. The signal must be defined and identified; the parameters of the signal must be gotten before it can be placed in decoder/demodulator. In other words, the signal must be qualitatively analyzed first of all.

In that way, it is clearly obvious that signals analysis take the very important place in lot’s of directions of the radio sphere.

SA allows to realize analysis for everyone who wants it. You can’t be born as an analyst, but you can become the analyst.