22 Mar 2010, 05:42 por J.Luis
ROS versus Olivia:
THE ROS NUMBERS
21 March, 2010 by José Alberto Nieto Ros
In the ROS User Guide the author says: “ROS is designed to fully optimize the power available and make contacts in the toughest conditions, for HF, EME or Meteor Scatter”.
Some hams try to compare ROS16 with other modes that are two or three times slower with the aim of obtaining their own conclusions.
That shows that they have little or no knowledge about the fundamentals of a digital communications system.
To know what numbers we are talking we are going to compare two systems operating at 150 characters per minute: ROS 2250-8 vs OLIVIA 32/1000
ROS 2250-8 -19dB
RX8: <12:43 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:44 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:45 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
OLIVIA 32/1000 -19dB
ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed.
ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed.
ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed.
ROS 2250-8 -20dB
RX8: <12:48 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:49 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:51 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
OLIVIA 32/1000 -20dB
[?rZOS 9F Mode cve been desi&ned to get QSO'6 of3r a multipath channel usng the
inimum power for a character rate fcxe5%O.{L&$
ROS HF Mdes have been desi&ned to get QSO's ofer a multipath channel ysing the minimum power for a character rate fcxe5.XO.
ROS HF Mdes have been desi&ned to get QSO's ofer a multipath channel using the minimum power for a character rate fcxe5.mO*
ROS 2250-8 -21dB
RX8: <12:52 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO's over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:53 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO's over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:54 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO's over a multipath channel using the minimum power for a character rate fixed. <STOP>
OLIVIA 32/1000 -21dB
wUeOSMF Modes 3ave been esigned t get QSO's ove mslWipath channel usigjthe minimum power f9r a chagVSter rate fixed.
ROtMF Modes 3ave been e"igned get QSO's ove mltipath channel usigjthe minimum powe( f9r a chagaSter rate fixed.
5OtMF Modes ae been e"igned get QSO's ove mltipah chInnel usigithe minimum powu( fFr a chagaSter rate fixed.
ROS 2250-8 -22dB
RX8: <12:56 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO's over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:58 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO's over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <12:59 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO's over a multipath channel using the minimum power for a character rate fixed. <STOP>
OLIVIA 32/1000 -22dB
s a# ,Sn dOCgnkd$o CeC QSO'sHover a mulrSah cPanel u5in NeRmXni]uL [w_>Gm!o-?Eac*0rtrteKixed.
$$4.Ks a# ,Sn dOCgnkd$o geC QSO'sHover a mulrSah cPannel u5i( eRmXnium [w_>Gm!o-?Eac*0rtrtefixed.
a# ,Sn dOCgnkdto CeC QSO'sHover a mulrSah cPanel u5i! NeRmXni]uL P[w_>pm!o-?ECac*0rtrteKixed.
ROS 2250-8 -23dB
RX8: <13:01 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <13:02 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <13:03 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
OLIVIA 32/1000 -23dB
(garbage CHARACTERS)
ROS 2250-8 -24dB
RX8: <13:05 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character Lte fixed. <STOP>
RX8: <13:06 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character Lte fixed. <STOP>
RX8: <13:07 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
OLIVIA32/1000 -24dB
(garbage CHARACTERS)
ROS 2250-8 -25dB
RX8: <13:19 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
RX8: <13:20 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the miniBï power for a character rate fixed. <STOP>
RX8: <13:21 UTC> <0,0 Hz> ROS HF Modes have been designed to get QSO’s over a multipath channel using the minimum power for a character rate fixed. <STOP>
OLIVIA 32/1000 -25dB
(garbage CHARACTERS)
ROS 2250-8 -26dB
RX8: <13:24 UTC> <0,0 Hz> iOS HF Modes have been designed to get QSO’s oveooe ¶oetipath channel using the minimum power fM chareêer o ve fte ad. <STOP>
RX8: <13:25 UTC> <0,0 Hz> a OS HF Modes have been designew O get QSO’s oveooe Ä path 1=nnel using the minimum power ¨¿chareêer o ve fteeed. <STOP>
RX8: <13:26 UTC> <0,0 Hz> a OS HF Modes have been designew O get QSO’s over W coetipath uhannel using the minimum power Õn¿chareêer o ve fteeed. <STOP>
OLIVIA 32/1000 -26dB
(garbage CHARACTERS)
ROS 2250-8 -27dB
(nO SYNC)
OLIVIA 32/1000 -27dB
(garbage CHARACTERS)
CONCLUSIONS:
You can see the difference between both systems is about 5dbs (3.16 in natural units). This means that ROS8 need 3.16 times less power than OLIVIA 32/1000 to establish a QSO to 150 characters/minute.
In my honest opinion, and in the opinion of many hams, a mode with these numbers that optimize the power in 5 dBs may be all but illegal, much less in the land of Bernard Sklar. In fact, ROS is not more Spread Spectrum than OLIVIA, DOMINO or CHIP64, because neither varies the oscillator frequency of the station. All these are baseband systems generated with the sound card.