Signal Identification

From HFUnderground

Revision as of 16:18, 2 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.

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 3 kHz Not Applicable Not Applicable FMCW transmission, changes sweep rates in 16 steps, resulting in 16 different sounds per transmission, pilot tone precedes each rate change Unknown 16 x 64 sounder recording link here 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.

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