Signal Identification

From HFUnderground

Revision as of 04:20, 4 December 2014

Crude mock-up of the start of a signal identification section of the wiki.

Guidelines, goals, structure, and how to use described here.

Non DATA Signals

Communications Modes

Mode	Frequency Range (kHz)	Bandwidth (kHz)	Shift (Hz)	Number of Tones	Key Features	Sources	Recording	Spectrum Image
AM	All Frequencies in the HF Range	Typically 2.6 to 10.0 kHz, can be wider or narrower	Not Applicable	Not Applicable	Carrier present in center of signal, audio typically mirrored left and right of the carrier	World wide	AM recording link here
CW (Morse Code)	All Frequencies in the HF Range	Very narrow, potentially less than 50 Hz	Not Applicable	Not Applicable	Line or broken line on the waterfall, no sidebands, may show wider "key clicks" at the start and stop of each dot and dash	World wide	CW recording link here
LSB	All Frequencies in the HF Range	Typically 2.4 to 3.0 kHz, can be wider or narrower	Not Applicable	Not Applicable	No carrier present in Spectrum, audio typically bunched to towards the right (low audio frequency)	World wide	LSB recording link here
USB	All Frequencies in the HF Range	Typically 2.4 to 3.0 kHz, can be wider or narrower	Not Applicable	Not Applicable	No carrier present in Spectrum, audio typically bunched to towards the left (low audio frequency)	World wide	USB recording link here

Non Communications Modes

Mode	Frequency Range (kHz)	Bandwidth (kHz)	Shift (Hz)	Number of Tones	Key Features	Sources	Recording	Spectrum Image
16 x 64 Sounder (nickname, official name or designation not known)	Below 4000 to above 30000 observed	2.5 kHz	Not Applicable	Not Applicable	FMCW transmission, changes sweep rates in 16 steps, resulting in 16 different sounds per transmission, a pilot tone may precede each rate change but is not always present	Unknown	Media:16x64_sounder.mp3 16 x 64 sounder recording
PLUTO radar (possible offical name, PLUTO II, suggested by open source documents)	8000 to 38000	3 to 40 kHz, depending on specific operating conditions	Not Applicable	Not Applicable	FMCW transmission, presenting a wide signal equal to the swept (chirped) width, sweep rate creates a pulsed sound affect	British Sovereing base of Akrotiri, Island of Cyprus	PLUTO recording link here

Need to put some kind of break here, a line or something, to sep out the Non DATA from DATA

Probably need to put a desription of what is meant by DATA Signals in this area.

DATA Signals

FSK Modes

Mode	Frequency Range (kHz)	Bandwidth (kHz)	Shift (Hz)	Number of Tones	Key Features	Sources	Recording	Spectrum Image
CIS 36-50, BEE, T-600	All Frequencies in the HF Range	0.085 to 0.500 kHz (85 to 500 Hz depending on mode)	85, 125, 250, or 500, only one shift used at a time	2	Appears as two lines on waterfall, seperated by the shift, normally encrypted	Used by Russian or Russian supplied forces, a mode of the T-600 modem	CIS 36-50 recording link here
STANAG 4481 FSK	All Frequencies in the HF Range	0.85 kHz (850 Hz)	850 Hz	2	Appears as two lines on waterfall, seperated by the shift, normally encrypted	Used by NATO forces world wide	4481 FSK recording link here

MFSK Modes

PSK Modes

SELCAL Modes

Image Modes