EA5HVK

On April 24,  Giussepe IK5UIM completed a QSO with Jesús CO2DC across the Atlantic with only 5 watts and some interferences of RTTY contest on 7050 Mhz. Speed: 150 characters/minute (8 bauds).

Giussepe started with 300 watts, but at the end he realized 5 watts were enough with this technology for HF.

Congratulations to Giussepe and Jesús for the great QSO and for reporting  the log file.

RX8: <01:11 UTC> <-3.9 Hz> CO2DC  CO2DC  CO2DC  de  IK5UIMetyftEeM  IKe fM  ok dear very good mode of trasmission  it©vhis versions becose the  3.3.3 have bigh problem in sincro.  tnx fer qsra ciao ciao a go to bed in italy now     is local time 3.11  isn nigth  CO2DC de IK5UIM  <STOP> <-14 dB>
TX8: <01:14 UTC> IK5UIM.IK5UIM de CO2DC CO2DC U ARE STILL WITH ONLY 5 W ?? AND YES THE NEW VERSION HAS NO MISTAKES OR BUGS AND THE LINE TO WRITE IS DOUBLE  MORE EASY TO READ WHAT U WRITE , OK GO TO BED AND MONDAY I WILL SEND ROS A COPY OF THIS LOG FOR HIM TO KNOW HOW 40M WORK WITH ONLY 5 W ACROOS THE ATLANTIC  73 CIAO AND SWEET DREAMS GIUSEPPE  IK5UIM.IK5UIM de CO2DC CO2DC KN <STOP>
RX8: <01:17 UTC> <-3.9 Hz> CO2DC  CO2DC  CO2DC  de  IK5UIM emK5UIM  IK5UIM very good copy  i run only 5 watts  only 5 watts  tnx  for gegging     ciao ciarXphd dx in ros mode  73    KCO2DC de IK5UIM sk S/t+e -14 dB, Marge: +12 dB Email:  <IK5UIM@TIN.IT>  <IK5UIM@TIN.IT> ¨ <STOP> <-11 dB>
TX8: <01:19 UTC> IK5UIM.IK5UIM de CO2DC CO2DC S/N: -14 dB, Marge: +12 dB  73 tnx fer QSO, 73. IK5UIM de CO2DC sk  <STOP>
RX8: <01:20 UTC> <-3.9 Hz> CO2DVSe IK5UIM ciao grazie per il contatto   alla prossima.. … <STOP> <-11 dB>

New QSO Europe-New Zealand, RA6DJ (20 watts) with ZL2FT (10 watts) at 16 bauds with a ¡¡ Fade Marge of only 2 dBs!!.

In thats conditions is bettter down to 8 bauds (taking advantage of the ROS Auto RX options). Marge of 2 dBs is very poor for a long DX communication over HF. 

From Twiter (http://twitter.com/rosfsk):

via @ZL2FT: Woked Ivan RA6DJ on 20mtrs 14.103mhz Ros at 0424utc , 100% copy both ways, i was running 10 watts into my inverted vee with a Ic

Thanks for the info, Jason, and congratulations. At 8 bauds you could have used only ¡¡5 watts!!. At Twente i only could copy the messages from RA6DJ:

RX16: <04:24 UTC> <-15,6 Hz> ZL2FT    ZL2FT    ZL2FT    de  RA6DJ  RA6DJ  RA6DJ  kn  <STOP> <2 dB>
RX16: <04:26 UTC> <-15,6 Hz> ZL2FT   de RA6DJ My name is Ivan, my QTH is Krasnodar, Locator: KN95ma S/N: -21 dB, Marge: +2 dB  <STOP> <4 dB>
RX16: <04:27 UTC> <-15,6 Hz> RRRRRRStation: ROS v3.3.0 Beta, TS-850S 20W Ant. A3S Yagi tnx fer QSO,  GB 73. ZL2FT   de RA6DJ sk  <STOP> <-2 dB>
RX16: <04:28 UTC> <-15,6 Hz> Long path , Jason73!!! <STOP> <5 dB>
RX16: <04:29 UTC> <-15,6 Hz> 73! All the best!QSL via e-qsl ZL2FT   de RA6DJ  sk <STOP> <6 dB>

New DX Europe-Australia. Franco IZ1MKE with Tim VK4YEH on 14103 using ROS8/2250 working with a Fade Marge of only 5 dBs above threshold of modulation over a fadding channel. I acknowledge that ROS tests have exceeded all my expectations. 🙂

Thanks Franco for the info and good DX.

ROS RECEIVED FROM 16.335 KM MY QTH

VK4YEH has received your Radio Message sent at: 08:02 UTC

Received Message: ‘VK4YEH VK4YEH VK4YEH de IZ1x yE IZ1MKE IZ1MKE kn Email: ‘

Operator Info:
Callsign: VK4YEH
Name: Tim
E-mail: vk4yeh@gmail.com
QTH: Brisbane, Australia
Locator: QG62ll
Station: FT-950
ROS Version: 3.3.0 Beta

Signal Info:
Channel: HF
Symbol Rate: 8 bauds
BW: 2250 Hz
Frame Acquisition: 18/21
Final Acquisition: 14/16
Frequency Shift: 27.3 Hz
Symbol Error detected by Viterbi: 20%
S/N (2500 Hz): -21 dB, Fade Marge: +5 dB
PTT Loop: Disabled
Vumeter Level: -16 dB      (Volume very low. Better -10 or -5 dB)
CPU Usage: 12 %

Congratulations for the QSO

On April 9 at 00:00:01 UTC, a new improvement will be incorporated to ROS 1/2250. Now this protocol will use  a more diversity in frequency. This mode is the best opcion for QRP extreme over a HF channel. 

As before, changes have been programmed previously in the software 2 weeks ago, so you should not problems during the transition.

Also, by suggestion of Vladimir Shabaldas (VA3LLZ), i have add an option of RX AUTO to can receive automaticly at all the differents symbols rate.  As this require more CPU usage, you can decide if you want auto decode 16 and 8, or if you want auto decode at 16, 8 and 1.

You must check CPU Usage Gauge to know if you can use this option, or you can select AFC +-78Hz to reduce CPU Usage. As you have realized working with ROS, AFC of 78Hz is enough for the most of QSO’s.  

This new version will be upload today at 00:00.

Enjoy it

Australia-Twente on 7.050 Mhz. again 

But this time more difficult yet : 8 bauds  🙂   (ROS8/2250)

Wohh. Intercepted two messages from Australia in the Twente SDR on 7.050 Mhz. Mode ROS1/2250.

¡18.000 kms! Perfect copy with strong multipath.

RX1: <18:28 UTC> <11,2 Hz> CQ VK4YEH QG62LL  <STOP> <-22 dB>
RX1: <18:31 UTC> <11,2 Hz> CQ VK4YEH QG62LL  <STOP> <-18 dB>

¡Excellent SDR!

¡Great QSO! On March 3, ON3WP could establish contact with ZL1RS  using a vertical  antenna and 3 Watts on 20 meters. 

(With the ROS new versions, it is recommend to select 8 bauds for that purpose).

Congratulations for the QSO and thanks for the info.

HELLO JOSE,

GREAT CONTACT 05/03/2010 – 08H29 IN ROS 16 PWR 3 Wtt ICOM 703 ANT VERT 12 AVQ GRND  ON 14.103 WITH BOB ZL1RS DISTANCE MY LOCATOR JO10UJ LOCATOR ZL1RS RF64US = 18.170 KM IN 3Wtt

JOSE CONGRATULATION FOR THE PROGRAM ROS GOOD GOOD

73’s DE SERGE ON3WP/QRP

Woohh. Intercepted these messages from  7J1ADS (Japan) in the Twente SDR on 14103. Fade Marge  between 4 and 8 dB. ¡10.000 Kms. !    

ROS has been included in the list of Digital Modes of  ADIF.org and eQSL.cc

http://www.adif.org/adif225.htm#Mode Enumeration

thanks to all

On March 28 at 00:00:01 UTC, new improvements will be incorporated to ROS 16 HF Modes for 2250 and 500 Hz. It will improve even more the robutness again HF slow fadding and interferences. This possibility also that two stations can transmit with ROS 16 at the same time, however, that is not the main of ROS HF modes. The real objective of these improvements is to optimize the power of the rig (QRP communications).

In the case of ROS 8 bauds these improvements are already available (only we have to wait people with v2.8.0 change his old version).

Changes have been programmed previously in the software to avoid the chaos with the different versions. You just have to wait for D-Day and H-Hour and  if you are using latest version you should not have problems during the transition from the old to the new protocol.

To celebrate this new change, I have prepared a new version that measures the S/N Rate  and that allows us to estimate how much power you can reduce without losing the link. It will ready on March 28.

Thank you all for experimenting with ROS and contribute to its development. Enjoy it