16 MFSK 64 HZ B/W Plain text EME mode 1 Baud
While routing round for a ROS version that was compatible with 6-9-0
and finding 6-9-1 is compatible, the version change was adding the compatibility
routine to enable other app's like 'spec lab' to run, without
altering the performance , I noticed , as well as the discontinued
500 Hz B/W Hf mode the version contains the EME mode , as well
as the mf2 and mf7 modes , making 5 systems in the one package
Quite how it was missed by the EME user's ,
but at 64 Hz on air bandwidth 16 tone mfsk ,
it offers a plain text chat mode over the eme path ,
using very little space, the comment on the path,
indicates , that narrow systems are suitable ..
A novel facility is the search , allowing reception if
the signal is over +/- ! KHz from the center to correct
Works as qrp mode on MF equally as well
at -35 dB s/n
Extract from the user info
Is a mode designed for Moon Bounce communications. The communication channel in this modality is quite different from that of HF, and the frequency diversity systems don't provide any significant advantage. That's why the modulation system used is the classic 16-tone MFSK.
To ensure a better orthogonality the tones have been separated by 4Hz, a more than sufficient amount, to achieve a 64Hz bandwidth.
The slender bandwidth required by this modulation allows us to perform automatic frequency scanning of up to ±1300Hz, very useful to detect Doppler shift when working Moon Bounce on 70cm.
The symbol rate is 1 baud, being a mode that also decodes in real time, allowing the asynchronous Moon Bounce communication as well. It can decode signals of up to –35dBs over noise AWGN.
In addition, ROS EME uses an initial synchronism sequence that allows detecting the received signal's Doppler shift and subsequently starting to decode in real time.
ROS HF, as well as ROS EME use as FEC the popular convolutional code R=1/2, K=7 NASA Standard.
This software sends automatically ***reports to the operators who include their email address in any of their messages. The reports include reception conditions and information about the receiving station. More details on this manual.
*** This refers to the auto report option, that emails directly to a decoded e-mail address , an example
[Fade Marge: +22 dB = Im running about 20 dB too much power for the link ]
********** Please do not reply to this email ********************
OE7DMT has received your Radio Message sent at: 21:29 UTC
Message Received: Report: OE7DMT de G0NBD S/N: -4 dB, Marge: +12 dB g0nbd@... (BRM) <CRC-OK>
DXCC: Austria (EU)
QTH: Tirol / Kirchbichl
Station: TRX :IC-7300 /Ant. Dipol / Power 30 W ROS Version: ROS v7.4.0
Frequency: 7,048 Mhz
Symbol Rate: 4 Bauds
Frame Acquisition: 22/24
Final Acquisition: 14/16
Frequency Shift: 0,0 Hz
S/N (2500 Hz): +0 dB, Fade Marge: +22 dB
Distance: 1254 km, Azimuth: 127
Vumeter Level: -27 dB
CPU Usage: 33 %
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