Radiogram transfer using ROS

Successful transfer of  emcom ARRL radiogram transfer between 3B8FO and VK6YM at a distance of  5612 km between -14 to -20 s/n with 3B8FO using his NVIS inverted L antenna.

Successful ROS QSO with Herve VK6YM

3B8FO ,using his NVIS inverted L antenna, had some successful ROS qsos with Herve VK6YM on 14.103 today  when both fsq and winlink vara failed.Power used on both sides was 50W.

Winlink standard radiogram

Herve VK6YM successfully received standard emcom IARU  and ARRL forms from 3B8FO by winlink Winmor.

ROS datamode

Is having successful qso with Herve VK6YM  using ROS data mode.

ROS is a data mode developed by José Alberto Nieto Ros EA5HVK.

ROS implements a combination of FHSS (Frequency Hopping Spread Spectrum), DSSS (Direct Sequence Spread Spectrum) and 2G (Second Generation) CDMA (Code Division Multiple Access), The modem deployed's a 144 MFSK phase continuous single tone, modulation scheme, ROS may be amplified by non-linear Tx path. Class c/d/e.

ROS provides efficient use of channel capacity and Data rate/power ratio and is exceptionally robust, being well suited to QRP Dx, low power chat and disturbed paths, ie, Polar and NVIS 5 MHz, where conventional data modes are unable to provide communication's.

Might use it together with FSQ for our emcom communicating channel.


Download and additional info available at

https://rosmodem.wordpress.com/

https://www.dropbox.com/s/jokk3dfe0vofcuc/Le%20ROS%2C%20qu%E2%80%99est%20ce%20que%20c%E2%80%99est%20%20by%20F1UCG.pdf

Emcom meeting with 3B8BAN

3B8FO had a meeting with Francois 3b8ban on sunday 17/06 in his shack at R-Hill.He was shown the  antenna farm of 3B8FO and they  discussed about the various NVIS antenna configuration possibilities and SWR issues.

Emcom tests using fsq and NBEMS

During the past few days many standard emcom messages  were successfully  transferred from 3b8fo to 3b8cw using the NBEMS suite of software as well as FSQ.

In my next post I will start talking about my version of NBEMS which I intend to propose for adoption for emcom purposes.

FSQ /file transfer tests carried out the past few days

3b8FO had successful messaging sessions with 3b8cw using fsq these past two days.

Standard formatted messages using flmsg messaging software on the fldigi platform  and using thor 22 as the data protocol  were successfully transferred from 3b8fo  to 3b8cw.

As from now on 3B8FO shall be sending regular info about encom practice using the NBEMS(Narrow band emergency system) and winlink concepts and suite of protocols both for HF and VHF.

Additional FSQ features.

Ability to conduct semi‐automatic nets.
Net control does not need to be present at station to take check‐ins and simple (non‐critical) messages related to net coordination.

Ability of stations to “message” each other as needed, even if they cannot directly
communicate, by using messaging relay function and relaying through intermediate stations.

Ability to poll stations to determine viability of RF link.

Ability to store messages at attended/unattended stations.

Ability to change the transmitting speed at another station.

Ability to open two instances of Fldigi to facilitate FSQCall keyboard‐to‐keyboard
chat messaging (1500 hz default) while using other Fldigi modes such as Thor or MFSK (700 Hz recommended) for formal traffic.