MFSK: Rosmodem

Rosmodem

Amateur mode, Br~15.5 or 1, Sh~15.5, Freqs~144 or more

Here is the sample of this signal, recieved from the real air. Send by Zmej.

Here is an example of work of the new ROS protocol.

(Author): SergUA6

Band Width ~2250-2300 Hz

Low Range ~400 Hz, shift is possible

Baud Rate ~15.5, and very slow mode 1 Hz

Count of Carriers not less than 144

Step between carriers ~15.5 Hz

Pilot tone(s) Start tone ~1481 Hz, with duration ~ 4200 ms,shift is possible

ACF ~18662 ms

RX mode SSB

Sonograms:

pic.1 General view

pic.2 Manipulation speed

Diagrams:

pic.3 Allocation of frequencies and their quantity

pic.4 the signal's ACF and view in VMW

ROSMODEM - the new radio amateur protocol created by Spanish developer Alberto Nieto Ros, the technology of the extension of a spectrum is put in a basis. In this signal if to trust the description, base MFSK-16 extends by the pseudo-casual law at least to MFSK-144. High enough characteristics of this protocol are declared. ACF most likely connected with the period of pseudo-casual sequences of randomization, but this is only supposition. The real transfer speed is essentially lower then speed of manipulation, that can indirectly speak not only about the spectrum extension, but also about usage of serious noise-resistant coding. The mode with speed of manipulation 1 Hz is supported, here are used formerstep between frequencies and principle of creation former.