Redundant Digital File Transfer (RDFT)

From Signal Identification Wiki
Jump to: navigation, search
Redundant Digital File Transfer (RDFT)
Digtrx intro.jpg
Frequencies 9240 kHzKiloHertz (kHz) 10^3 Hz9,240,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
9.24 MHzMegaHertz (MHz) 10^6 Hz
,9065 kHzKiloHertz (kHz) 10^3 Hz9,065,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
9.065 MHzMegaHertz (MHz) 10^6 Hz
9,065 kHzKiloHertz (kHz) 10^3 Hz
9.065 MHzMegaHertz (MHz) 10^6 Hz
9,240 kHzKiloHertz (kHz) 10^3 Hz
9.24 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 9.065 MHzMegaHertz (MHz) 10^6 Hz9,065,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
9,065 kHzKiloHertz (kHz) 10^3 Hz
- 9.24 MHzMegaHertz (MHz) 10^6 Hz9,240,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
9,240 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation PSKPhase-Shift Keying
ACF
Bandwidth 1800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).1.8 kHzKiloHertz (kHz) 10^3 Hz
0.0018 MHzMegaHertz (MHz) 10^6 Hz
1.8 kHzKiloHertz (kHz) 10^3 Hz
0.0018 MHzMegaHertz (MHz) 10^6 Hz
1.8 kHzKiloHertz (kHz) 10^3 Hz
0.0018 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description RDFT is an amateur radio digital mode used to transmit files.
I/Q Raw Recording
Audio Sample
RDFT is an amateur radio digital mode used to transmit files. Uses DPSKDifferential Phase-Shift Keying

The only station known to utilize RDFT is the infamous Cuban Numbers Stations (Enigma designation HM01). HM01 transmits both a synthesized voice signal as well as the RDFT file transfer mode. Files are sent in .TXT format but are encrypted. This station is known to use the broadcast facilities - via a feeder or other unknown means - of Radio Habana.

The only application known to copy the files (but not necessarily decrypt them) is DIGTRX.


Decoding Software[edit]

Hobby Level Software

DIGTRX was developed by Roland Zurmely PY4ZBZ, a Brazillian Ham Radio operator. This software was originally intended for use in amateur radio for Digital SSTV, but is also able to send images and other computer files using the computer's sound card.

This software has been long abandoned for other modes and has been replaced by HamDRM and other similar digital SSTV software.

Audio Samples[edit]

RDFT Samples[edit]

RDFT Intro RDFT EOT
Digtrx intro.jpg
DIGTRX EOT.jpg

Cuban Numbers Station[edit]

HM01
HM01 Waterfall2thmb.jpg

Video Examples[edit]

Frequencies[edit]

For up to date listings, subscribe to the UDXF Yahoo group and see the Numbers and Oddities website


Additional Links[edit]

Additional Images[edit]