The recordered signal comes from Swiss Diplo: they use the LP (Linking Protection) facility to prevent ID spoofing and protect the linking as speciefied in MIL 188-141B As the other commercail decoders, K500 does not understand this waveform so it prints out random "commands" from the ALE ...

hola, I had this signal via Twente SDR on USB 14301.8 (cf) on 28/06/15 (1710z) just in the 20 mt band, reserved to HAM traffic. The waveform is an OFDM 16-tone PSK, 75 Bd and 110 Hz shift, sent in burst mode. It is very similar to the obsoleted Standard NATO MIL 188-110A Appendix A without the doppl...

la bienvenida a bordo !

Ya te lo ha dicho todo el maestro. También uso el Audacity para trabajar con audio, tanto desde un receptor convencional como desde el SDR. Fácil de manejar, versátil y te permite mucho juego. Conecta la salida de audio del receptor a la entrada de líinea de la tarjeta de audio y selecciona ésta en...

hi all

1635Z//CTA00I/CTA02I/CTA04I/CTA12I/CTA14I/CTA19I//

are not tests but CARB (Channel Availability and Receipt Broadcast) transmissions as in
http://i56578-swl.blogspot.it/search/label/CARB

saludos muy cordiales,

Antonio

fixed: it was a bad recording due to a narrow filter cutting off part of the signal :( here a correct recording: https://www.dropbox.com/s/relrmp58ct8v029/5-symbol_MFSK_34%2B34.wav?dl=0 Signal bandwidth is approximately 3250 Hz. The signals has 68 tones (34 + 34), 47 hertz spaced, plus a visible emp...

this waveform was seen on 14635.0 USB (dial freq) and it seems to me an MFSK 47 tones, 47 spaced, and 47 Baud speed... that's a bit odd. Maybe I made some wrongs, someone can verify? A short recording may be downloaded from here: https://www.dropbox.com/s/87e0e8rxybiokqv/websdr_recording_2015-05-28T...

feliz per el tu nuevo SDR

Antonio

Hola, unid FSK 100/2000 system heard this morning (19 May) on 12129.5 cf starting from 0640, s/off at 0650. It sounds like an ARQ system, possibly from Russian Military. As far as I know, it seems that the signal is sent by an outstation to its main 'home' station, that in its turn operates in CIS 3...

hola,

maybe Frequency-hopping Spread Spectrum (FHSS) ?
http://i56578-swl.blogspot.it/search/label/FHSS

ciao,
Antonio